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diff --git a/test/graphviz/graph_hard/graphviz_1.txt b/test/graphviz/graph_hard/graphviz_1.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6790f41953d98110a0d9bfae840469e7a30d8678
--- /dev/null
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+<AML Screening, connectedTo, Cryptocurrency Exchange>
+<AML Screening, partOf, AML Screening>
+<Account Closure, connectedTo, Merger and Acquisition>
+<Account Verification, connectedTo, Securities Trading>
+<Approval Decision, connectedTo, Payment Gateway Integration>
+<Approval Decision, partOf, Approval Decision>
+<Asset Management, connectedTo, Market Analysis>
+<Asset Management, partOf, Asset Management>
+<Blockchain Verification, connectedTo, Cryptocurrency Exchange>
+<Credit Scoring, connectedTo, Asset Management>
+<Credit Scoring, connectedTo, Debt Collection>
+<Cryptocurrency Exchange, connectedTo, Account Closure>
+<Cryptocurrency Exchange, connectedTo, Credit Scoring>
+<Cryptocurrency Exchange, connectedTo, Interest Calculation>
+<Debt Collection, connectedTo, Investment Planning>
+<Debt Collection, connectedTo, KYC Validation>
+<Dispute Resolution, connectedTo, Fraud Check>
+<Dispute Resolution, partOf, Dispute Resolution>
+<Financial Advisory, connectedTo, AML Screening>
+<Financial Advisory, partOf, Financial Advisory>
+<Fraud Check, connectedTo, Financial Advisory>
+<Fraud Check, partOf, Fraud Check>
+<Interest Calculation, connectedTo, Account Closure>
+<Interest Calculation, connectedTo, KYC Validation>
+<Investment Planning, connectedTo, Account Closure>
+<Investment Planning, connectedTo, IPO Launch>
+<Investment Planning, connectedTo, Interest Calculation>
+<Investment Planning, connectedTo, KYC Validation>
+<Investment Planning, connectedTo, Securities Trading>
+<Investment Planning, connectedTo, Treasury Management>
+<KYC Validation, connectedTo, Account Closure>
+<KYC Validation, connectedTo, Account Verification>
+<KYC Validation, connectedTo, IPO Launch>
+<KYC Validation, connectedTo, Merger and Acquisition>
+<KYC Validation, connectedTo, Treasury Management>
+<Market Analysis, connectedTo, Approval Decision>
+<Market Analysis, partOf, Market Analysis>
+<Merger and Acquisition, connectedTo, IPO Launch>
+<Payment Gateway Integration, connectedTo, Account Closure>
+<Payment Gateway Integration, partOf, Payment Gateway Integration>
+<Securities Trading, connectedTo, Account Closure>
+<Treasury Management, connectedTo, Account Verification>
+<Treasury Management, connectedTo, Dispute Resolution>
diff --git a/test/graphviz/graph_hard/graphviz_10.dot b/test/graphviz/graph_hard/graphviz_10.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f4aa287b90723b69b3ab77e04a48aef6f6d185ce
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_10.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TD
+	N0 [label="Scholarship Evaluation" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N1 [label="Student Enrollment" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N2 [label="Club Registration" color="#82DAFF" fillcolor="#C8EDFF" shape=Mdiamond style=filled]
+	N3 [label="Timetable Scheduling" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N4 [label="Extracurricular Activity" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N5 [label="Document Verification" color="#3F51B5" fillcolor="#C5CAE9" shape=octagon style=filled]
+	N6 [label="Curriculum Development" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N7 [label="School Accreditation" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+	N8 [label="Field Trip Coordination" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N9 [label="Course Material Preparation" color="#82DAFF" fillcolor="#C8EDFF" shape=oval style=filled]
+	N10 [label="Grade Entry" color="#3F51B5" fillcolor="#C5CAE9" shape=Mdiamond style=filled]
+	N11 [label="Library Registration" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N12 [label="Faculty Recruitment" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N13 [label="Online Learning Platform Management" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N14 [label="Exam Conduct" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N15 [label="Alumni Network Management" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Peer Tutoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Special Education Support" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_1 [label="Study Abroad Program" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Assignment Submission" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Advisory Committee Meeting" color="#82DAFF" fillcolor="#C8EDFF" shape=octagon style=filled]
+		nest1_1 [label="Digital Resource Management" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
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+	N9 -> N10 [label=develops color="#82DAFF" dir=forward penwidth=1.5 style=solid]
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+	nest1_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
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+	S1 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [label=advises color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N3 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [label=monitors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_100.dot b/test/graphviz/graph_hard/graphviz_100.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8c076bbd6b2088d4d4ac40f994dffe709ab50777
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_100.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=LR
+	N0 [label="Applicant Tracking System Management" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Candidate Experience Management" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N2 [label="Campus Recruitment" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N3 [label="Diversity Sourcing" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N4 [label="Freelancer Engagement" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N5 [label=Negotiation color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N6 [label="Global Recruitment Strategy" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Recruitment Metrics Reporting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Contingent Workforce Management" color="#673AB7" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+		nest0_1 [label="Candidate Tracking" color="#4CAF50" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+		nest0_2 [label="Interview Panel Coordination" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	}
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+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Internal Mobility" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Talent Pipeline Building" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest1_1 [label="Recruitment Process Outsourcing Management" color="#673AB7" fillcolor="#D1C4E9" shape=plaintext style=filled]
+		nest1_2 [label="Background Check" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest1_3 [label="Executive Search" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+}
diff --git a/test/graphviz/graph_hard/graphviz_101.dot b/test/graphviz/graph_hard/graphviz_101.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a34df901f2ade05769702a4c6eef7be16171a91d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_101.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=RL
+	N0 [label="Psychometric Testing" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
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+	N13 [label="Talent Pipeline Building" color="#64B5F6" fillcolor="#E3F2FD" shape=Mdiamond style=filled]
+	N14 [label="Temporary Staffing" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N15 [label="Candidate Assessment Design" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N16 [label="Compliance in Hiring" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N17 [label="Candidate Experience Management" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label=Negotiation labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Competency_Based Interviewing" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+		nest0_1 [label="Candidate Screening" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+		nest0_2 [label="Freelancer Engagement" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Social Recruiting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Onboarding Handoff" color="#F7BEE0" fillcolor="#FAEBF3" shape=Mdiamond style=filled]
+		nest1_1 [label="Interview Conducting" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+		nest1_2 [label="AI in Recruitment" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N17 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N14 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_101.txt b/test/graphviz/graph_hard/graphviz_101.txt
new file mode 100644
index 0000000000000000000000000000000000000000..008e43730ff44ba0fe02a6db29171561d0879a35
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_101.txt
@@ -0,0 +1,47 @@
+<AI in Recruitment, connectedTo, Employee Referral Program>
+<AI in Recruitment, partOf, AI in Recruitment>
+<Background Check, connectedTo, Candidate Assessment Design>
+<Background Check, connectedTo, Executive Search>
+<Background Check, connectedTo, Recruitment Process Outsourcing Management>
+<Candidate Assessment Design, connectedTo, Compliance in Hiring>
+<Candidate Relationship Management, connectedTo, Internal Mobility>
+<Candidate Screening, connectedTo, Freelancer Engagement>
+<Candidate Screening, partOf, Candidate Screening>
+<Competency_Based Interviewing, connectedTo, Candidate Screening>
+<Competency_Based Interviewing, partOf, Competency_Based Interviewing>
+<Compliance in Hiring, connectedTo, Candidate Experience Management>
+<Contingent Workforce Management, connectedTo, Employer Branding>
+<Contingent Workforce Management, connectedTo, Executive Search>
+<Contingent Workforce Management, connectedTo, Temporary Staffing>
+<Employee Referral Program, connectedTo, Recruiter Training>
+<Employee Referral Program, connectedTo, Temporary Staffing>
+<Employer Branding, connectedTo, Background Check>
+<Employer Branding, connectedTo, Compliance in Hiring>
+<Employer Branding, connectedTo, Executive Search>
+<Employer Branding, connectedTo, Job Description Creation>
+<Executive Search, connectedTo, Recruitment Process Outsourcing Management>
+<Freelancer Engagement, connectedTo, Recruitment Process Outsourcing Management>
+<Freelancer Engagement, partOf, Freelancer Engagement>
+<Headhunting, connectedTo, Contingent Workforce Management>
+<Headhunting, connectedTo, Executive Search>
+<Internal Mobility, connectedTo, Candidate Experience Management>
+<Internal Mobility, connectedTo, Interview Panel Coordination>
+<Internal Mobility, connectedTo, Job Description Creation>
+<Internal Mobility, connectedTo, Talent Pipeline Building>
+<Internal Mobility, connectedTo, Temporary Staffing>
+<Interview Conducting, connectedTo, AI in Recruitment>
+<Interview Conducting, partOf, Interview Conducting>
+<Interview Panel Coordination, connectedTo, Employee Referral Program>
+<Interview Panel Coordination, connectedTo, Temporary Staffing>
+<Job Description Creation, connectedTo, Competency_Based Interviewing>
+<Job Description Creation, connectedTo, Interview Panel Coordination>
+<Onboarding Handoff, connectedTo, Interview Conducting>
+<Onboarding Handoff, partOf, Onboarding Handoff>
+<Psychometric Testing, connectedTo, Executive Search>
+<Psychometric Testing, connectedTo, Headhunting>
+<Psychometric Testing, connectedTo, Temporary Staffing>
+<Recruiter Training, connectedTo, Talent Pipeline Building>
+<Recruitment Process Outsourcing Management, connectedTo, Candidate Relationship Management>
+<Talent Pipeline Building, connectedTo, Onboarding Handoff>
+<Talent Pipeline Building, connectedTo, Temporary Staffing>
+<Temporary Staffing, connectedTo, Candidate Assessment Design>
diff --git a/test/graphviz/graph_hard/graphviz_103.dot b/test/graphviz/graph_hard/graphviz_103.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2777afc02d1cba126ccbd7fe380990536f2ecedc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_103.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=TD
+	N0 [label="Customer Loyalty Program Support" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Live Chat Support" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N2 [label="Sentiment Analysis" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N3 [label="Multilingual Support" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N4 [label="Order Status Check" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N5 [label="Personalized Assistance" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N6 [label="Issue Escalation" color="#AABEC6" fillcolor="#E0E6E9" shape=folder style=filled]
+	N7 [label="Customer Journey Mapping" color="#FF5722" fillcolor="#FFCCBC" shape=oval style=filled]
+	N8 [label="Cross_selling Opportunities" color="#FF5722" fillcolor="#FFCCBC" shape=oval style=filled]
+	N9 [label="FAQ Management" color="#AABEC6" fillcolor="#E0E6E9" shape=octagon style=filled]
+	N10 [label="Feedback Loop to Product Development" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N11 [label="Up_selling Opportunities" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+	N12 [label="Accessibility Support" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N13 [label="Email Support" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Service Blueprinting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Technical Support" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+		nest0_1 [label="Complaint Resolution" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest0_2 [label="Customer Onboarding Support" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+		nest0_3 [label="Product Information Provision" color="#AABEC6" fillcolor="#E0E6E9" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Customer Success Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Feedback Collection" color="#B8C0F5" fillcolor="#ECF0FD" shape=plaintext style=filled]
+		nest1_1 [label="Customer Retention Strategies" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N6 -> S2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_104.txt b/test/graphviz/graph_hard/graphviz_104.txt
new file mode 100644
index 0000000000000000000000000000000000000000..41ebe29f2aa4f0107a625f6add3a4a254e8dba35
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_104.txt
@@ -0,0 +1,44 @@
+<Accessibility Support, connectedTo, Feedback Loop to Product Development>
+<Account Management, connectedTo, Accessibility Support>
+<Complaint Resolution, connectedTo, Account Management>
+<Complaint Resolution, connectedTo, Feedback Loop to Product Development>
+<Complaint Resolution, connectedTo, Self_Service Portal Management>
+<Complaint Resolution, connectedTo, Service Level Agreement Monitoring>
+<Complaint Trend Analysis, connectedTo, Complaint Resolution>
+<Complaint Trend Analysis, connectedTo, Personalized Assistance>
+<Cross_selling Opportunities, connectedTo, Complaint Trend Analysis>
+<Customer Journey Mapping, connectedTo, Customer Onboarding Support>
+<Customer Journey Mapping, partOf, Customer Journey Mapping>
+<Customer Loyalty Program Support, connectedTo, Inquiry Handling>
+<Customer Onboarding Support, connectedTo, Up_selling Opportunities>
+<Customer Onboarding Support, partOf, Customer Onboarding Support>
+<Customer Relationship Management System Use, connectedTo, Product Information Provision>
+<Customer Relationship Management System Use, connectedTo, Up_selling Opportunities>
+<Customer Retention Strategies, connectedTo, Service Level Agreement Monitoring>
+<Customer Retention Strategies, partOf, Customer Retention Strategies>
+<Customer Success Management, connectedTo, Accessibility Support>
+<Customer Success Management, connectedTo, Customer Loyalty Program Support>
+<Customer Success Management, connectedTo, Feedback Loop to Product Development>
+<Customer Success Management, connectedTo, Inquiry Handling>
+<Customer Success Management, connectedTo, Service Recovery>
+<Feedback Collection, connectedTo, Live Chat Support>
+<Feedback Loop to Product Development, connectedTo, Service Recovery>
+<Inquiry Handling, connectedTo, Account Management>
+<Live Chat Support, connectedTo, Product Information Provision>
+<Live Chat Support, connectedTo, Sentiment Analysis>
+<Personalized Assistance, connectedTo, Technical Support>
+<Personalized Assistance, partOf, Personalized Assistance>
+<Post_Service Follow_up, connectedTo, Product Information Provision>
+<Product Information Provision, connectedTo, Customer Success Management>
+<Self_Service Portal Management, connectedTo, Post_Service Follow_up>
+<Sentiment Analysis, connectedTo, Customer Relationship Management System Use>
+<Sentiment Analysis, connectedTo, Inquiry Handling>
+<Service Level Agreement Monitoring, connectedTo, Feedback Collection>
+<Service Level Agreement Monitoring, connectedTo, Inquiry Handling>
+<Service Level Agreement Monitoring, connectedTo, Product Information Provision>
+<Technical Support, connectedTo, Customer Retention Strategies>
+<Technical Support, partOf, Technical Support>
+<Training Customer Service Agents, connectedTo, Cross_selling Opportunities>
+<Up_selling Opportunities, connectedTo, Customer Journey Mapping>
+<Up_selling Opportunities, connectedTo, Product Information Provision>
+<Up_selling Opportunities, connectedTo, Self_Service Portal Management>
diff --git a/test/graphviz/graph_hard/graphviz_105.txt b/test/graphviz/graph_hard/graphviz_105.txt
new file mode 100644
index 0000000000000000000000000000000000000000..86497d549aae6a6d52a22fc6bf99aa54c9ef2fa7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_105.txt
@@ -0,0 +1,43 @@
+<Call Center Management, connectedTo, Customer Loyalty Program Support>
+<Call Center Management, connectedTo, First Contact Resolution Optimization>
+<Call Center Management, connectedTo, Issue Escalation>
+<Call Center Management, monitors, Product Information Provision>
+<Complaint Trend Analysis, connectedTo, Customer Satisfaction Survey>
+<Complaint Trend Analysis, partOf, Complaint Trend Analysis>
+<Cross_selling Opportunities, connectedTo, Post_Service Follow_up>
+<Cross_selling Opportunities, resolves, Email Support>
+<Customer Journey Mapping, connectedTo, Call Center Management>
+<Customer Journey Mapping, connectedTo, Live Chat Support>
+<Customer Loyalty Program Support, connectedTo, Live Chat Support>
+<Customer Loyalty Program Support, connectedTo, Refund Processing>
+<Customer Onboarding Support, connectedTo, Customer Success Management>
+<Customer Onboarding Support, connectedTo, Live Chat Support>
+<Customer Retention Strategies, connectedTo, Call Center Management>
+<Customer Retention Strategies, connectedTo, Feedback Loop to Product Development>
+<Customer Retention Strategies, connectedTo, Issue Escalation>
+<Customer Satisfaction Survey, connectedTo, Feedback Collection>
+<Customer Satisfaction Survey, partOf, Customer Satisfaction Survey>
+<Customer Success Management, connectedTo, Customer Retention Strategies>
+<Customer Success Management, connectedTo, Email Support>
+<Customer Success Management, connectedTo, Feedback Loop to Product Development>
+<Customer Success Management, connectedTo, Live Chat Support>
+<Email Support, connectedTo, Issue Escalation>
+<FAQ Management, connectedTo, Order Status Check>
+<FAQ Management, partOf, FAQ Management>
+<Feedback Collection, connectedTo, Product Information Provision>
+<Feedback Collection, partOf, Feedback Collection>
+<Feedback Loop to Product Development, connectedTo, Customer Journey Mapping>
+<First Contact Resolution Optimization, connectedTo, Email Support>
+<Issue Escalation, connectedTo, Customer Loyalty Program Support>
+<Issue Escalation, connectedTo, FAQ Management>
+<Issue Escalation, connectedTo, Product Information Provision>
+<Live Chat Support, connectedTo, Training Customer Service Agents>
+<Order Status Check, connectedTo, Live Chat Support>
+<Order Status Check, partOf, Order Status Check>
+<Post_Service Follow_up, connectedTo, Service Blueprinting>
+<Proactive Communication, connectedTo, Customer Onboarding Support>
+<Product Information Provision, connectedTo, Customer Loyalty Program Support>
+<Refund Processing, connectedTo, Complaint Trend Analysis>
+<Refund Processing, partOf, Refund Processing>
+<Service Blueprinting, connectedTo, Technical Support>
+<Technical Support, connectedTo, Proactive Communication>
diff --git a/test/graphviz/graph_hard/graphviz_106.txt b/test/graphviz/graph_hard/graphviz_106.txt
new file mode 100644
index 0000000000000000000000000000000000000000..84b51918250ef91664e72397c74ef76ed395af3a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_106.txt
@@ -0,0 +1,36 @@
+<Circular Economy Practices, connectedTo, Logistics Optimization>
+<Circular Economy Practices, connectedTo, Performance Monitoring>
+<Cold Chain Logistics, connectedTo, Circular Economy Practices>
+<Collaborative Planning, connectedTo, Warehouse Automation>
+<Collaborative Planning, partOf, Collaborative Planning>
+<Customs Compliance, connectedTo, Performance Monitoring>
+<Demand Planning, connectedTo, Global Sourcing Strategy>
+<Demand Planning, connectedTo, Supply Chain Visibility>
+<Freight Auditing, partOf, Freight Auditing>
+<Freight Auditing, simulates, Order Fulfillment>
+<Global Sourcing Strategy, connectedTo, Freight Auditing>
+<Global Sourcing Strategy, partOf, Global Sourcing Strategy>
+<Hazardous Materials Handling, optimizes, Procurement>
+<Inventory Management, connectedTo, Cold Chain Logistics>
+<Inventory Management, connectedTo, Customs Compliance>
+<Logistics Optimization, connectedTo, Order Fulfillment>
+<Order Fulfillment, returns, Risk Mitigation Strategies>
+<Predictive Analytics, connectedTo, Inventory Management>
+<Procurement, connectedTo, Demand Planning>
+<Quality Control in Supply Chain, connectedTo, Customs Compliance>
+<Quality Control in Supply Chain, connectedTo, Performance Monitoring>
+<Risk Mitigation Strategies, connectedTo, Supplier Relationship Management>
+<Supplier Relationship Management, connectedTo, Customs Compliance>
+<Supplier Relationship Management, negotiates, Supplier Selection>
+<Supplier Selection, connectedTo, Customs Compliance>
+<Supplier Selection, connectedTo, Hazardous Materials Handling>
+<Supplier Selection, connectedTo, Quality Control in Supply Chain>
+<Supply Chain Visibility, connectedTo, Customs Compliance>
+<Supply Chain Visibility, connectedTo, Third_Party Logistics Management>
+<Sustainability Initiatives, connectedTo, Customs Compliance>
+<Sustainability Initiatives, connectedTo, Performance Monitoring>
+<Sustainability Initiatives, connectedTo, Quality Control in Supply Chain>
+<Third_Party Logistics Management, connectedTo, Collaborative Planning>
+<Third_Party Logistics Management, connectedTo, Sustainability Initiatives>
+<Warehouse Automation, partOf, Warehouse Automation>
+<Warehouse Automation, transports, Inventory Management>
diff --git a/test/graphviz/graph_hard/graphviz_107.dot b/test/graphviz/graph_hard/graphviz_107.dot
new file mode 100644
index 0000000000000000000000000000000000000000..53b30581e188bcfdf95a1e3ecbe1a05e055c18ce
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_107.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Supplier Selection" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Logistics Optimization" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+	N2 [label="Third_Party Logistics Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N3 [label="Warehouse Automation" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N4 [label="Container Tracking" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Cold Chain Logistics" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+	N6 [label="Reverse Logistics" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N7 [label="Predictive Analytics" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N8 [label="Supply Chain Visibility" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N9 [label="Collaborative Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N10 [label="Production Scheduling Integration" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N11 [label="Distribution Network Design" color="#DCE775" fillcolor="#FCFCE7" shape=folder style=filled]
+	N12 [label="Customs Compliance" color="#DCE775" fillcolor="#FCFCE7" shape=octagon style=filled]
+	N13 [label="Performance Monitoring" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N14 [label="Last_Mile Delivery Optimization" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Order Fulfillment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Hazardous Materials Handling" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+		nest0_1 [label="Risk Management" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Supplier Relationship Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Inventory Management" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_1 [label="Material Flow Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest1_2 [label="Data Analytics for Supply Chain" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=researches color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [label=inspects color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N5 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [label=communicates color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [label=monitors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_108.dot b/test/graphviz/graph_hard/graphviz_108.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e44f62e78bb63748939e00bd0ab89a5ae8663b3c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_108.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Transportation Management" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N1 [label="Supplier Relationship Management" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N2 [label="Collaborative Planning" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N3 [label="Global Sourcing Strategy" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N4 [label="Performance Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=folder style=filled]
+	N5 [label="Sustainability Initiatives" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N6 [label="Demand Planning" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N7 [label="Predictive Analytics" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N8 [label="Warehouse Automation" color="#E91E63" fillcolor="#F8BBD0" shape=Mdiamond style=filled]
+	N9 [label=Warehousing color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+	N10 [label="Circular Economy Practices" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N11 [label="Customs Compliance" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N12 [label="Reverse Logistics" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N13 [label="Distribution Network Design" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Contract Manufacturing Oversight" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Risk Mitigation Strategies" color="#F44336" fillcolor="#FFCDD2" shape=diamond style=filled]
+		nest0_1 [label="Last_Mile Delivery Optimization" color="#E57373" fillcolor="#FFEBEE" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Data Analytics for Supply Chain" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Material Flow Management" color="#E91E63" fillcolor="#F8BBD0" shape=plaintext style=filled]
+		nest1_1 [label="Production Planning" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N12 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_109.txt b/test/graphviz/graph_hard/graphviz_109.txt
new file mode 100644
index 0000000000000000000000000000000000000000..26b2b821bff5ad196d7d02039a286f1a922d82b9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_109.txt
@@ -0,0 +1,33 @@
+<Asset Management, connectedTo, Exploration>
+<Core Logging, connectedTo, Regulatory Compliance Reporting>
+<Core Logging, partOf, Core Logging>
+<Drilling and Blasting, connectedTo, Asset Management>
+<Dust Control, connectedTo, Mine Dewatering>
+<Dust Control, partOf, Dust Control>
+<Environmental Impact Assessment, connectedTo, Energy Management>
+<Environmental Impact Assessment, connectedTo, Resource Estimation>
+<Environmental Impact Assessment, connectedTo, Robotics in Mining>
+<Exploration, connectedTo, Energy Management>
+<Exploration, connectedTo, Permit Acquisition>
+<Exploration Drilling, connectedTo, Drilling and Blasting>
+<Exploration Drilling, connectedTo, Regulatory Compliance Reporting>
+<Exploration Drilling, connectedTo, Waste Rock Management>
+<Haulage, connectedTo, Product Marketing>
+<Mine Dewatering, connectedTo, Mineral Processing>
+<Mine Dewatering, partOf, Mine Dewatering>
+<Mine Planning, connectedTo, Product Marketing>
+<Mine Planning, partOf, Mine Planning>
+<Mineral Processing, connectedTo, Mine Planning>
+<Mineral Processing, partOf, Mineral Processing>
+<Permit Acquisition, connectedTo, Core Logging>
+<Permit Acquisition, partOf, Permit Acquisition>
+<Product Marketing, connectedTo, Dust Control>
+<Product Marketing, connectedTo, Environmental Impact Assessment>
+<Regulatory Compliance Reporting, connectedTo, Waste Rock Management>
+<Resource Estimation, connectedTo, Drilling and Blasting>
+<Resource Estimation, connectedTo, Robotics in Mining>
+<Robotics in Mining, connectedTo, Drilling and Blasting>
+<Ventilation System, connectedTo, Exploration Drilling>
+<Ventilation System, connectedTo, Waste Rock Management>
+<Waste Rock Management, connectedTo, Drilling and Blasting>
+<Waste Rock Management, sells, Haulage>
diff --git a/test/graphviz/graph_hard/graphviz_11.dot b/test/graphviz/graph_hard/graphviz_11.dot
new file mode 100644
index 0000000000000000000000000000000000000000..76f010ec9832b065d3303b29b7dd340177cca491
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_11.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=RL
+	N0 [label="Online Learning Platform Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Attendance Tracking" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N2 [label="Field Trip Coordination" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N3 [label="Internship Coordination" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N4 [label="Digital Resource Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=folder style=filled]
+	N5 [label="Disciplinary Action" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N6 [label="Lecture Delivery" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Academic Review" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+	N8 [label="Study Abroad Program" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N9 [label="Graduation Approval" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N10 [label="Peer Tutoring" color="#CDDC39" fillcolor="#E6EE9C" shape=plaintext style=filled]
+	N11 [label="Assignment Submission" color="#D3EB9F" fillcolor="#F8FDD3" shape=folder style=filled]
+	N12 [label="Transcript Issuance" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N13 [label="Course Selection" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N14 [label="Counseling Session" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N15 [label="Student Application" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	S0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Scholarship Evaluation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="School Accreditation" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_1 [label="Document Verification" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Parent_Teacher Conference" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Research Grant Application" color="#E91E63" fillcolor="#FCE4EC" shape=diamond style=filled]
+		nest1_1 [label="Advisory Committee Meeting" color="#CDDC39" fillcolor="#E6EE9C" shape=plaintext style=filled]
+		nest1_2 [label=Orientation color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=evaluates color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=assesses color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=publishes color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N14 -> nest1_0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=advises color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N14 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_111.txt b/test/graphviz/graph_hard/graphviz_111.txt
new file mode 100644
index 0000000000000000000000000000000000000000..71332bd9143ff7a28ed6dcca312b4e3890ff1896
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_111.txt
@@ -0,0 +1,37 @@
+<Core Logging, connectedTo, Exploration Drilling>
+<Core Logging, markets, Haulage>
+<Dust Control, connectedTo, Resource Estimation>
+<Dust Control, partOf, Dust Control>
+<Emergency Response Planning, connectedTo, Geotechnical Stability Analysis>
+<Emergency Response Planning, connectedTo, Noise Management>
+<Emergency Response Planning, connectedTo, Ventilation System>
+<Emergency Response Planning, designs, Reclamation>
+<Emergency Response Planning, monitors, Smelting>
+<Equipment Maintenance, connectedTo, Core Logging>
+<Exploration Drilling, connectedTo, Emergency Response Planning>
+<Exploration Drilling, connectedTo, Noise Management>
+<Feasibility Study, connectedTo, Equipment Maintenance>
+<Feasibility Study, connectedTo, Exploration Drilling>
+<Feasibility Study, connectedTo, Mine Planning>
+<Feasibility Study, connectedTo, Noise Management>
+<Geological Survey, connectedTo, Exploration Drilling>
+<Geological Survey, partOf, Geological Survey>
+<Geotechnical Stability Analysis, connectedTo, Noise Management>
+<Geotechnical Stability Analysis, connectedTo, Smelting>
+<Geotechnical Stability Analysis, connectedTo, Ventilation System>
+<Geotechnical Stability Analysis, secures, Reclamation>
+<Haulage, connectedTo, Exploration Drilling>
+<Mine Planning, connectedTo, Exploration Drilling>
+<Mine Planning, connectedTo, Mineral Processing>
+<Mine Planning, optimizes, Waste Rock Management>
+<Mineral Processing, connectedTo, Geological Survey>
+<Mineral Processing, partOf, Mineral Processing>
+<Noise Management, connectedTo, Smelting>
+<Reclamation, connectedTo, Noise Management>
+<Resource Estimation, connectedTo, Mine Planning>
+<Resource Estimation, partOf, Resource Estimation>
+<Ventilation System, explores, Reclamation>
+<Waste Rock Management, connectedTo, Equipment Maintenance>
+<Waste Rock Management, connectedTo, Water Management>
+<Water Management, connectedTo, Dust Control>
+<Water Management, partOf, Water Management>
diff --git a/test/graphviz/graph_hard/graphviz_113.txt b/test/graphviz/graph_hard/graphviz_113.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3b03b00e0aea7ada2de2852ebe8fc2f37ae3fdf7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_113.txt
@@ -0,0 +1,45 @@
+<Autonomous Vessels, connectedTo, Digitalization of Shipping>
+<Autonomous Vessels, connectedTo, Hydrographic Surveying>
+<Ballast Water Management, connectedTo, Inland Waterway Transport>
+<Ballast Water Management, partOf, Ballast Water Management>
+<Container Tracking, connectedTo, Autonomous Vessels>
+<Container Tracking, partOf, Container Tracking>
+<Digitalization of Shipping, connectedTo, Search and Rescue Coordination>
+<Digitalization of Shipping, partOf, Digitalization of Shipping>
+<Fisheries Management, connectedTo, Ship Registry>
+<Fleet Management, analyzes, Maritime Law Compliance>
+<Fleet Management, connectedTo, Autonomous Vessels>
+<Fleet Management, connectedTo, Fisheries Management>
+<Fleet Management, connectedTo, Marine Data Analytics>
+<Fleet Management, connectedTo, Voyage Optimization>
+<Inland Waterway Transport, connectedTo, Terminal Management>
+<Inland Waterway Transport, partOf, Inland Waterway Transport>
+<Marine Data Analytics, regulates, Autonomous Vessels>
+<Marine Insurance, connectedTo, Fleet Management>
+<Marine Research, connectedTo, Marine Data Analytics>
+<Marine Research, connectedTo, Marine Insurance>
+<Marine Research, connectedTo, Maritime Law Compliance>
+<Marine Research, connectedTo, Ship Registry>
+<Marine Research, connectedTo, Voyage Optimization>
+<Marine Research, responds, Fisheries Management>
+<Maritime Law Compliance, connectedTo, Autonomous Vessels>
+<Maritime Law Compliance, connectedTo, Hydrographic Surveying>
+<Maritime Law Compliance, connectedTo, Marine Data Analytics>
+<Maritime Law Compliance, connectedTo, Port Operations>
+<Maritime Security, connectedTo, Fisheries Management>
+<Maritime Security, connectedTo, Marine Research>
+<Navigation, connectedTo, Ship Design>
+<Port Operations, docks, Ballast Water Management>
+<Port Operations, partOf, Port Operations>
+<Route Planning, connectedTo, Fisheries Management>
+<Route Planning, connectedTo, Navigation>
+<Search and Rescue Coordination, connectedTo, Subsea Cable Laying>
+<Search and Rescue Coordination, partOf, Search and Rescue Coordination>
+<Ship Design, connectedTo, Fisheries Management>
+<Ship Design, connectedTo, Maritime Security>
+<Ship Registry, connectedTo, Maritime Law Compliance>
+<Subsea Cable Laying, connectedTo, Container Tracking>
+<Subsea Cable Laying, partOf, Subsea Cable Laying>
+<Terminal Management, connectedTo, Ship Registry>
+<Terminal Management, partOf, Terminal Management>
+<Voyage Optimization, connectedTo, Fisheries Management>
diff --git a/test/graphviz/graph_hard/graphviz_117.txt b/test/graphviz/graph_hard/graphviz_117.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0a081c116bed21fda8980982407b2d42c9d513e5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_117.txt
@@ -0,0 +1,27 @@
+<Astronaut Training, connectedTo, Spacecraft Control>
+<Astrophysics Research, connectedTo, In_Situ Resource Utilization>
+<Astrophysics Research, partOf, Astrophysics Research>
+<Data Acquisition, connectedTo, Scientific Data Analysis>
+<Exoplanet Discovery, connectedTo, Planetary Science Research>
+<Exoplanet Discovery, connectedTo, Space Debris Mitigation>
+<Exoplanet Discovery, connectedTo, Spacecraft Control>
+<In_Situ Resource Utilization, connectedTo, Data Acquisition>
+<In_Situ Resource Utilization, partOf, In_Situ Resource Utilization>
+<Launch Operations, connectedTo, Astrophysics Research>
+<Launch Operations, partOf, Launch Operations>
+<Mission Control Center Management, connectedTo, Data Acquisition>
+<Mission Control Center Management, connectedTo, Extravehicular Activity Planning>
+<Mission Control Center Management, connectedTo, Scientific Data Analysis>
+<New Space Technology Development, connectedTo, Astronaut Training>
+<New Space Technology Development, connectedTo, Mission Control Center Management>
+<New Space Technology Development, connectedTo, Spacecraft Control>
+<New Space Technology Development, regulates, Exoplanet Discovery>
+<Planetary Science Research, connectedTo, Spacecraft Control>
+<Planetary Science Research, receives, Astronaut Training>
+<Satellite Deployment, connectedTo, Astronaut Training>
+<Satellite Deployment, partOf, Satellite Deployment>
+<Scientific Data Analysis, connectedTo, Extravehicular Activity Planning>
+<Scientific Data Analysis, connectedTo, Launch Operations>
+<Space Debris Mitigation, connectedTo, Satellite Deployment>
+<Space Debris Mitigation, partOf, Space Debris Mitigation>
+<Spacecraft Control, secures, Mission Control Center Management>
diff --git a/test/graphviz/graph_hard/graphviz_118.txt b/test/graphviz/graph_hard/graphviz_118.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cff3bb77cef2c886546db90aebef4273193c7abd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_118.txt
@@ -0,0 +1,37 @@
+<Adaptation Strategy Development, connectedTo, Aerosol Impact Assessment>
+<Adaptation Strategy Development, connectedTo, Solar Radiation Management Research>
+<Adaptation Strategy Development, connectedTo, Water Resource Management under Climate Change>
+<Aerosol Impact Assessment, connectedTo, Climate Education Programs>
+<Aerosol Impact Assessment, connectedTo, Ocean Current Analysis>
+<Aerosol Impact Assessment, connectedTo, Solar Radiation Management Research>
+<Aerosol Impact Assessment, connectedTo, Water Resource Management under Climate Change>
+<Climate Education Programs, connectedTo, Ocean Current Analysis>
+<Climate Finance Tracking, connectedTo, Environmental Justice Study>
+<Climate Finance Tracking, partOf, Climate Finance Tracking>
+<Cloud Formation Research, observes, Solar Radiation Management Research>
+<Drought Monitoring and Forecasting, connectedTo, Ecological Footprint Calculation>
+<Drought Monitoring and Forecasting, partOf, Drought Monitoring and Forecasting>
+<Ecological Footprint Calculation, connectedTo, Ocean Current Analysis>
+<Ecological Footprint Calculation, partOf, Ecological Footprint Calculation>
+<Ecosystem Response Modeling, connectedTo, Ocean Current Analysis>
+<Ecosystem Response Modeling, partOf, Ecosystem Response Modeling>
+<Environmental Justice Study, connectedTo, Paleoclimate Reconstruction>
+<Environmental Justice Study, partOf, Environmental Justice Study>
+<Green Technology Incubation, connectedTo, Glacier Mass Balance Monitoring>
+<International Climate Negotiation, connectedTo, Mitigation Technology Evaluation>
+<International Climate Negotiation, connectedTo, Solar Radiation Management Research>
+<Mitigation Technology Evaluation, connectedTo, Adaptation Strategy Development>
+<Mitigation Technology Evaluation, connectedTo, Cloud Formation Research>
+<Mitigation Technology Evaluation, connectedTo, Public Engagement on Climate>
+<Mitigation Technology Evaluation, connectedTo, Water Resource Management under Climate Change>
+<Ocean Current Analysis, connectedTo, Green Technology Incubation>
+<Paleoclimate Reconstruction, connectedTo, Ecosystem Response Modeling>
+<Paleoclimate Reconstruction, partOf, Paleoclimate Reconstruction>
+<Public Engagement on Climate, connectedTo, Adaptation Strategy Development>
+<Public Engagement on Climate, connectedTo, Drought Monitoring and Forecasting>
+<Public Engagement on Climate, connectedTo, Ocean Current Analysis>
+<Public Engagement on Climate, connectedTo, Water Resource Management under Climate Change>
+<Solar Radiation Management Research, connectedTo, Climate Education Programs>
+<Solar Radiation Management Research, connectedTo, Ocean Current Analysis>
+<Water Resource Management under Climate Change, connectedTo, Climate Finance Tracking>
+<Water Resource Management under Climate Change, connectedTo, Cloud Formation Research>
diff --git a/test/graphviz/graph_hard/graphviz_119.dot b/test/graphviz/graph_hard/graphviz_119.dot
new file mode 100644
index 0000000000000000000000000000000000000000..225160ce7af4e9e94cc47c7f8531aaf3421cf599
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_119.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Collection" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N1 [label="Permafrost Thaw Assessment" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N2 [label="Glacier Mass Balance Monitoring" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N3 [label="Renewable Energy Potential Assessment" color="#FFE470" fillcolor="#FFFAE0" shape=Mdiamond style=filled]
+	N4 [label="Ice Sheet Dynamics" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Environmental Justice Study" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N6 [label="Paleoclimate Reconstruction" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N7 [label="Ecological Footprint Calculation" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N8 [label="Atmospheric Monitoring" color="#FFA726" fillcolor="#FFF3E0" shape=oval style=filled]
+	N9 [label="Ocean Acidification Studies" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Solar Radiation Management Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Carbon Sequestration Technologies" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+		nest0_1 [label="Ecosystem Response Modeling" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Carbon Cycle Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Climate Change Vulnerability Assessment" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest1_1 [label="Arctic and Antarctic Research" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=validates color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
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+	N2 -> nest0_0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_122.dot b/test/graphviz/graph_hard/graphviz_122.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6399fee97f8ff8f4e3eeb06b8658dd40de380d62
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_122.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=RL
+	N0 [label="Satellite Meteorology" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Synoptic Chart Analysis" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N2 [label="Fire Weather Forecasting" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+	N3 [label="Hurricane Trajectory Modeling" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N4 [label="Tornado Watch or Warning" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N5 [label="Boundary Layer Study" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N6 [label="Drought Monitoring" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+	N7 [label="Public Weather Briefing" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N8 [label="Aviation Weather Briefing" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N9 [label="Upper Air Chart Analysis" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N10 [label="Atmospheric Data Collection" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N11 [label="Ocean_Atmosphere Interaction Study" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N12 [label="Tropical Cyclone Analysis" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N13 [label="Snowfall Measurement" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Marine Weather Forecast" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Seasonal Outlook Preparation" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_1 [label="Mesoscale Meteorology" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Climate Change Impact Study" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Humidity Sensing" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+		nest1_1 [label="Cloud Observation" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest1_2 [label="Meteorological Instrument Calibration" color="#4DD0E1" fillcolor="#C9F0F0" shape=parallelogram style=filled]
+		nest1_3 [label="Flood Prediction" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=archives color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N11 [label=maps color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label=reports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [label=studies color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [label=warns color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_123.txt b/test/graphviz/graph_hard/graphviz_123.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3aae75c1a1b10063df9ef86ad44212187b1211be
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_123.txt
@@ -0,0 +1,47 @@
+<Agricultural Weather Advisory, connectedTo, Atmospheric Data Collection>
+<Agricultural Weather Advisory, connectedTo, Hurricane Trajectory Modeling>
+<Atmospheric Data Collection, connectedTo, Aviation Weather Briefing>
+<Atmospheric Sounding, connectedTo, Storm Tracking>
+<Atmospheric Sounding, partOf, Atmospheric Sounding>
+<Aviation Weather Briefing, connectedTo, Numerical Weather Prediction>
+<Boundary Layer Study, collects, Snowfall Measurement>
+<Boundary Layer Study, warns, Fire Weather Forecasting>
+<Climate Data Archiving, calibrates, Severe Weather Warning>
+<Climate Modeling, connectedTo, Ocean_Atmosphere Interaction Study>
+<Drought Monitoring, connectedTo, Boundary Layer Study>
+<Hurricane Trajectory Modeling, connectedTo, Climate Data Archiving>
+<Lightning Detection, partOf, Lightning Detection>
+<Lightning Detection, updates, Wind Speed and Direction>
+<Meteorological Instrument Calibration, connectedTo, Agricultural Weather Advisory>
+<Meteorological Instrument Calibration, connectedTo, Atmospheric Data Collection>
+<Meteorological Instrument Calibration, connectedTo, Hurricane Trajectory Modeling>
+<Meteorological Station Maintenance, identifies, Atmospheric Data Collection>
+<Nowcasting, connectedTo, Atmospheric Data Collection>
+<Nowcasting, connectedTo, Hurricane Trajectory Modeling>
+<Nowcasting, connectedTo, Satellite Meteorology>
+<Numerical Weather Prediction, connectedTo, Radar Imaging>
+<Ocean_Atmosphere Interaction Study, connectedTo, Boundary Layer Study>
+<Ocean_Atmosphere Interaction Study, connectedTo, Drought Monitoring>
+<Ocean_Atmosphere Interaction Study, connectedTo, Fire Weather Forecasting>
+<Pollution Dispersion Modeling, connectedTo, Climate Modeling>
+<Pollution Dispersion Modeling, connectedTo, Temperature Monitoring>
+<Precipitation Measurement, connectedTo, Hurricane Trajectory Modeling>
+<Precipitation Measurement, partOf, Precipitation Measurement>
+<Radar Imaging, connectedTo, Climate Modeling>
+<Radar Imaging, connectedTo, Drought Monitoring>
+<Radar Imaging, connectedTo, Fire Weather Forecasting>
+<Radar Imaging, connectedTo, Ocean_Atmosphere Interaction Study>
+<Radar Imaging, connectedTo, Pollution Dispersion Modeling>
+<Satellite Meteorology, connectedTo, Meteorological Instrument Calibration>
+<Severe Weather Warning, connectedTo, Meteorological Station Maintenance>
+<Severe Weather Warning, connectedTo, Numerical Weather Prediction>
+<Severe Weather Warning, connectedTo, Pollution Dispersion Modeling>
+<Severe Weather Warning, measures, Atmospheric Data Collection>
+<Snowfall Measurement, connectedTo, Lightning Detection>
+<Snowfall Measurement, partOf, Snowfall Measurement>
+<Storm Tracking, advises, Hurricane Trajectory Modeling>
+<Storm Tracking, partOf, Storm Tracking>
+<Temperature Monitoring, connectedTo, Atmospheric Sounding>
+<Temperature Monitoring, partOf, Temperature Monitoring>
+<Wind Speed and Direction, generates, Precipitation Measurement>
+<Wind Speed and Direction, partOf, Wind Speed and Direction>
diff --git a/test/graphviz/graph_hard/graphviz_124.txt b/test/graphviz/graph_hard/graphviz_124.txt
new file mode 100644
index 0000000000000000000000000000000000000000..957ba88c3bc5b97f073793571536e5cad47e0193
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_124.txt
@@ -0,0 +1,38 @@
+<Biomedical Waste Handling, connectedTo, Community Recycling Programs>
+<Biomedical Waste Handling, connectedTo, Illegal Dumping Monitoring>
+<Community Recycling Programs, connectedTo, Electronic Waste Recycling>
+<Community Recycling Programs, connectedTo, Illegal Dumping Monitoring>
+<Composting, connectedTo, Container Management>
+<Construction and Demolition Waste Management, connectedTo, Smart Waste Bins>
+<Container Management, connectedTo, Glass Recycling>
+<Electronic Waste Recycling, audits, Construction and Demolition Waste Management>
+<Electronic Waste Recycling, connectedTo, Illegal Dumping Monitoring>
+<Electronic Waste Recycling, connectedTo, Recycling Processing>
+<Electronic Waste Recycling, grades, Organics Collection>
+<Glass Recycling, connectedTo, Construction and Demolition Waste Management>
+<Hazardous Waste Disposal, connectedTo, Construction and Demolition Waste Management>
+<Hazardous Waste Disposal, partOf, Hazardous Waste Disposal>
+<Illegal Dumping Monitoring, connectedTo, Recycling Processing>
+<Industrial Waste Management, connectedTo, Illegal Dumping Monitoring>
+<Industrial Waste Management, connectedTo, Waste Management Policy Development>
+<Industrial Waste Management, connectedTo, Zero Waste Initiatives>
+<Organics Collection, connectedTo, Illegal Dumping Monitoring>
+<Paper Recycling, connectedTo, Illegal Dumping Monitoring>
+<Paper Recycling, partOf, Paper Recycling>
+<Public Education on Waste, educates, Hazardous Waste Disposal>
+<Public Education on Waste, partOf, Public Education on Waste>
+<Recycling Processing, connectedTo, Waste Logistics Optimization>
+<Recycling Processing, connectedTo, Waste Reduction Planning>
+<Recycling Processing, connectedTo, Waste_to_Energy Conversion>
+<Smart Waste Bins, connectedTo, Waste_to_Energy Conversion>
+<Textile Recycling, connectedTo, Industrial Waste Management>
+<Transfer Station Management, connectedTo, Paper Recycling>
+<Transfer Station Management, partOf, Transfer Station Management>
+<Waste Collection, connectedTo, Waste Logistics Optimization>
+<Waste Logistics Optimization, connectedTo, Composting>
+<Waste Management Policy Development, connectedTo, Biomedical Waste Handling>
+<Waste Management Policy Development, connectedTo, Illegal Dumping Monitoring>
+<Waste Management Policy Development, connectedTo, Public Education on Waste>
+<Waste Reduction Planning, connectedTo, Waste Collection>
+<Zero Waste Initiatives, connectedTo, Transfer Station Management>
+<Zero Waste Initiatives, partOf, Zero Waste Initiatives>
diff --git a/test/graphviz/graph_hard/graphviz_125.dot b/test/graphviz/graph_hard/graphviz_125.dot
new file mode 100644
index 0000000000000000000000000000000000000000..da6e61e7a1c970875c4ca5119d9ca92fabb7a49f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_125.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=BT
+	N0 [label=Composting color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Public Education on Waste" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N2 [label="Illegal Dumping Monitoring" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="Hazardous Waste Disposal" color="#C0CA33" fillcolor="#F9FBE7" shape=octagon style=filled]
+	N4 [label="Waste Collection" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N5 [label="Waste Reduction Planning" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N6 [label="Plastic Recycling Technologies" color="#82DAFF" fillcolor="#C8EDFF" shape=oval style=filled]
+	N7 [label="Waste Audit" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N8 [label="Waste Sorting" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N9 [label="Landfill Operation" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N10 [label="Recycling Processing" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N11 [label="Anaerobic Digestion" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N12 [label="Waste Management Policy Development" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+	N13 [label="Circular Economy Initiatives" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N14 [label="Organics Collection" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N15 [label="Waste Characterization Study" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N16 [label="Textile Recycling" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+	N17 [label="Waste Logistics Optimization" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Container Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Waste_to_Energy Conversion" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_1 [label="Transfer Station Management" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest0_2 [label="Electronic Waste Recycling" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest0_0 -> nest0_1 [label=innovates color="#FFA726" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Leachate Treatment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Paper Recycling" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest1_1 [label="Community Recycling Programs" color="#FFA726" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=grades color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=sorts color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [label=licenses color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N16 -> nest1_0 [label=minimizes color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=recycles color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label=enforces color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N11 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [label=composts color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N13 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [label=controls color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M2 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	M2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_126.dot b/test/graphviz/graph_hard/graphviz_126.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d0d96cd5d65c2d11d0ef0b122e83125d6cd5ef63
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_126.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=BT
+	N0 [label=Composting color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Closed_Loop Systems" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N2 [label="Container Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N3 [label="Landfill Gas Collection" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N4 [label="Waste Management Data Analytics" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N5 [label="Electronic Waste Recycling" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+	N6 [label="Waste Compaction" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N7 [label="Industrial Waste Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N8 [label="Recycling Processing" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N9 [label="Smart Waste Bins" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N10 [label="Extended Producer Responsibility" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N11 [label="Construction and Demolition Waste Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N12 [label="Metal Recycling" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N13 [label="Material Recovery Facility Operation" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N14 [label="Paper Recycling" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	S0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Waste Logistics Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Circular Economy Initiatives" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest0_1 [label="Transfer Station Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Waste_to_Energy Conversion" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Organics Collection" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_1 [label="Waste Reduction Planning" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+		nest1_2 [label="Waste Sorting" color="#AB47BC" fillcolor="#F3E5F5" shape=plaintext style=filled]
+		nest1_3 [label="Anaerobic Digestion" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N8 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_127.txt b/test/graphviz/graph_hard/graphviz_127.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b9a20e78bf247e49c7d54577dadb1bef1ab801c3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_127.txt
@@ -0,0 +1,37 @@
+<Agricultural Water Use Efficiency, connectedTo, Dam Management>
+<Billing and Revenue Management, connectedTo, Water Infrastructure Maintenance>
+<Billing and Revenue Management, connectedTo, Water Treatment>
+<Climate Change Adaptation for Water, connectedTo, Agricultural Water Use Efficiency>
+<Dam Management, connectedTo, Water Meter Reading>
+<Desalination, connectedTo, Billing and Revenue Management>
+<Ecosystem Protection, connectedTo, Groundwater Management>
+<Ecosystem Protection, licenses, Watershed Management>
+<Industrial Water Use Optimization, connectedTo, Dam Management>
+<Industrial Water Use Optimization, partOf, Industrial Water Use Optimization>
+<Pollution Source Identification, connectedTo, Climate Change Adaptation for Water>
+<Pollution Source Identification, connectedTo, Water Infrastructure Maintenance>
+<Pollution Source Identification, connectedTo, Water Source Identification>
+<Reservoir Operation, connectedTo, Climate Change Adaptation for Water>
+<Reservoir Operation, connectedTo, Water Infrastructure Maintenance>
+<Sewer System Inspection, connectedTo, Water Loss Detection>
+<Stormwater Management, connectedTo, Pollution Source Identification>
+<Stormwater Management, connectedTo, Water Meter Reading>
+<Stormwater Management, connectedTo, Water Source Identification>
+<Wastewater Collection, connectedTo, Dam Management>
+<Wastewater Collection, partOf, Wastewater Collection>
+<Wastewater Treatment, connectedTo, Climate Change Adaptation for Water>
+<Wastewater Treatment, connectedTo, Stormwater Management>
+<Water Infrastructure Maintenance, connectedTo, Ecosystem Protection>
+<Water Infrastructure Maintenance, connectedTo, Groundwater Management>
+<Water Infrastructure Maintenance, connectedTo, Water Quality Monitoring>
+<Water Loss Detection, connectedTo, Groundwater Management>
+<Water Loss Detection, maintains, Billing and Revenue Management>
+<Water Loss Detection, permits, Desalination>
+<Water Meter Reading, connectedTo, Sewer System Inspection>
+<Water Quality Monitoring, connectedTo, Ecosystem Protection>
+<Water Source Identification, connectedTo, Climate Change Adaptation for Water>
+<Water Source Identification, regulates, Reservoir Operation>
+<Water Treatment, allocates, Wastewater Collection>
+<Water Treatment, partOf, Water Treatment>
+<Watershed Management, connectedTo, Industrial Water Use Optimization>
+<Watershed Management, partOf, Watershed Management>
diff --git a/test/graphviz/graph_hard/graphviz_129.txt b/test/graphviz/graph_hard/graphviz_129.txt
new file mode 100644
index 0000000000000000000000000000000000000000..db00b17debae85b4da453ea18a8caa877a3fe8ca
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_129.txt
@@ -0,0 +1,30 @@
+<Agricultural Water Use Efficiency, evaluates, Hydroelectric Power Generation>
+<Dam Management, connectedTo, Agricultural Water Use Efficiency>
+<Dam Management, connectedTo, Greywater Recycling>
+<Dam Management, connectedTo, Hydroelectric Power Generation>
+<Dam Management, connectedTo, Industrial Water Use Optimization>
+<Dam Management, connectedTo, Water Resource Planning>
+<Dam Management, connectedTo, Water Scarcity Mitigation>
+<Desalination, connectedTo, Flood Control>
+<Desalination, partOf, Desalination>
+<Drinking Water Standards Compliance, connectedTo, Dam Management>
+<Flood Control, connectedTo, Sewer System Inspection>
+<Flood Control, partOf, Flood Control>
+<Greywater Recycling, connectedTo, Agricultural Water Use Efficiency>
+<Greywater Recycling, connectedTo, Industrial Water Use Optimization>
+<Hydroelectric Power Generation, connectedTo, Industrial Water Use Optimization>
+<Hydroelectric Power Generation, connectedTo, Water Resource Planning>
+<Irrigation Management, connectedTo, Desalination>
+<Irrigation Management, connectedTo, Drinking Water Standards Compliance>
+<Sewer System Inspection, connectedTo, Dam Management>
+<Sewer System Inspection, connectedTo, Greywater Recycling>
+<Sewer System Inspection, connectedTo, Hydroelectric Power Generation>
+<Sewer System Inspection, connectedTo, Irrigation Management>
+<Sewer System Inspection, connectedTo, Water Resource Planning>
+<Water Meter Reading, connectedTo, Industrial Water Use Optimization>
+<Water Meter Reading, connectedTo, Sewer System Inspection>
+<Water Resource Planning, connectedTo, Industrial Water Use Optimization>
+<Water Scarcity Mitigation, connectedTo, Watershed Management>
+<Water Scarcity Mitigation, partOf, Water Scarcity Mitigation>
+<Watershed Management, connectedTo, Sewer System Inspection>
+<Watershed Management, partOf, Watershed Management>
diff --git a/test/graphviz/graph_hard/graphviz_130.dot b/test/graphviz/graph_hard/graphviz_130.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1594a195cecaf032c68d1c8060287d8d2196b1e2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_130.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Life Cycle Assessment" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Tyre Recycling" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N2 [label="Glass Recycling" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N3 [label="Material Collection" color="#3F51B5" fillcolor="#C5CAE9" shape=octagon style=filled]
+	N4 [label="Commercial Recycling Solutions" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N5 [label="Hazardous Material Recovery" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N6 [label="Plastic Recycling" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N7 [label="Industrial Recycling Programs" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N8 [label="Closed_Loop Material Flow" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N9 [label="Cleaning and Processing" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N10 [label="Collection Point Management" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N11 [label="New Product Manufacturing" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N12 [label="Material Purity Testing" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N13 [label="Metal Recycling" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N14 [label="Battery Recycling" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N15 [label="Reprocessing into Raw Material" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Contamination Reduction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Chemical Recycling" color="#6EB76D" fillcolor="#E9F7E8" shape=oval style=filled]
+		nest0_1 [label="Mechanical Recycling" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+		nest0_2 [label="Recycling Facility Optimization" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Public Recycling Programs" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Product Design for Recyclability" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_1 [label="Advanced Sorting Technologies" color="#FFEB3B" fillcolor="#FFF9C4" shape=plaintext style=filled]
+		nest1_2 [label="Recycling Policy Advocacy" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label=processes color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N14 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_132.txt b/test/graphviz/graph_hard/graphviz_132.txt
new file mode 100644
index 0000000000000000000000000000000000000000..57748a83c09577af7603a45712144f7b0da297bd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_132.txt
@@ -0,0 +1,31 @@
+<Chemical Recycling, connectedTo, Public Recycling Programs>
+<Chemical Recycling, partOf, Chemical Recycling>
+<Circular Economy Implementation, connectedTo, Reprocessing into Raw Material>
+<Circular Economy Implementation, partOf, Circular Economy Implementation>
+<Collection Point Management, connectedTo, New Product Manufacturing>
+<Collection Point Management, connectedTo, Recycling Facility Optimization>
+<Composting Organic Waste, connectedTo, Collection Point Management>
+<Composting Organic Waste, connectedTo, Glass Recycling>
+<Composting Organic Waste, connectedTo, Paper Recycling>
+<Composting Organic Waste, connectedTo, Recycling Data Tracking>
+<Construction Waste Recycling, connectedTo, Composting Organic Waste>
+<Construction Waste Recycling, partOf, Construction Waste Recycling>
+<Deposit_Return Schemes, connectedTo, Waste Audit for Recycling>
+<Glass Recycling, connectedTo, Chemical Recycling>
+<Glass Recycling, partOf, Glass Recycling>
+<New Product Manufacturing, connectedTo, Circular Economy Implementation>
+<New Product Manufacturing, partOf, New Product Manufacturing>
+<Paper Recycling, connectedTo, Energy Recovery from Non_Recyclables>
+<Public Recycling Programs, connectedTo, Construction Waste Recycling>
+<Public Recycling Programs, partOf, Public Recycling Programs>
+<Recycling Data Tracking, melts, Collection Point Management>
+<Recycling Facility Optimization, connectedTo, Energy Recovery from Non_Recyclables>
+<Recycling Facility Optimization, connectedTo, Paper Recycling>
+<Recycling Facility Optimization, connectedTo, Recycling Infrastructure Development>
+<Recycling Infrastructure Development, connectedTo, Paper Recycling>
+<Reprocessing into Raw Material, connectedTo, Collection Point Management>
+<Reprocessing into Raw Material, partOf, Reprocessing into Raw Material>
+<Waste Audit for Recycling, connectedTo, Collection Point Management>
+<Waste Audit for Recycling, connectedTo, Composting Organic Waste>
+<Waste Audit for Recycling, connectedTo, Paper Recycling>
+<Waste Audit for Recycling, connectedTo, Recycling Facility Optimization>
diff --git a/test/graphviz/graph_hard/graphviz_133.dot b/test/graphviz/graph_hard/graphviz_133.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ea74a1b860d057c33defa98a39603684614aec57
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_133.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=TD
+	N0 [label="Biodiversity Conservation in Forests" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N1 [label="Tree Nursery Management" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N2 [label="Climate Change Adaptation in Forests" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N3 [label=Afforestation color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N4 [label="Wood Product Manufacturing" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N5 [label="Sustainable Forest Management" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N6 [label="Non_Timber Forest Product Collection" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N7 [label="Logging Operations" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N8 [label="Illegal Logging Prevention" color="#66BB6A" fillcolor="#E8F5E9" shape=octagon style=filled]
+	N9 [label="Timber Harvesting" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Forest Certification" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Forest Health Monitoring" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+		nest0_1 [label="Forest Fire Management" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+		nest0_2 [label="Forest Road Construction" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Public Access Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Tree Planting" color="#607D8B" fillcolor="#CFD8DC" shape=Mdiamond style=filled]
+		nest1_1 [label="Indigenous Forestry Practices" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+		nest1_2 [label="Carbon Sequestration Monitoring" color="#607D8B" fillcolor="#CFD8DC" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=researches color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=processes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=sells color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_133.txt b/test/graphviz/graph_hard/graphviz_133.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6f4c043bce3a23989fffdd0010922e2017dd5258
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_133.txt
@@ -0,0 +1,35 @@
+<Afforestation, connectedTo, Timber Harvesting>
+<Afforestation, connectedTo, Wood Product Manufacturing>
+<Biodiversity Conservation in Forests, connectedTo, Illegal Logging Prevention>
+<Biodiversity Conservation in Forests, connectedTo, Timber Harvesting>
+<Biodiversity Conservation in Forests, connectedTo, Tree Nursery Management>
+<Carbon Sequestration Monitoring, connectedTo, Timber Harvesting>
+<Carbon Sequestration Monitoring, partOf, Carbon Sequestration Monitoring>
+<Climate Change Adaptation in Forests, connectedTo, Afforestation>
+<Climate Change Adaptation in Forests, connectedTo, Illegal Logging Prevention>
+<Climate Change Adaptation in Forests, connectedTo, Non_Timber Forest Product Collection>
+<Forest Fire Management, connectedTo, Forest Road Construction>
+<Forest Fire Management, partOf, Forest Fire Management>
+<Forest Health Monitoring, connectedTo, Forest Fire Management>
+<Forest Health Monitoring, partOf, Forest Health Monitoring>
+<Forest Road Construction, connectedTo, Logging Operations>
+<Forest Road Construction, partOf, Forest Road Construction>
+<Illegal Logging Prevention, connectedTo, Timber Harvesting>
+<Illegal Logging Prevention, connectedTo, Tree Planting>
+<Indigenous Forestry Practices, partOf, Indigenous Forestry Practices>
+<Indigenous Forestry Practices, researches, Carbon Sequestration Monitoring>
+<Logging Operations, connectedTo, Illegal Logging Prevention>
+<Non_Timber Forest Product Collection, connectedTo, Logging Operations>
+<Sustainable Forest Management, connectedTo, Forest Health Monitoring>
+<Sustainable Forest Management, connectedTo, Illegal Logging Prevention>
+<Sustainable Forest Management, connectedTo, Logging Operations>
+<Sustainable Forest Management, connectedTo, Non_Timber Forest Product Collection>
+<Sustainable Forest Management, connectedTo, Timber Harvesting>
+<Tree Nursery Management, connectedTo, Climate Change Adaptation in Forests>
+<Tree Nursery Management, connectedTo, Non_Timber Forest Product Collection>
+<Tree Nursery Management, connectedTo, Timber Harvesting>
+<Tree Nursery Management, sells, Illegal Logging Prevention>
+<Tree Planting, connectedTo, Indigenous Forestry Practices>
+<Tree Planting, partOf, Tree Planting>
+<Wood Product Manufacturing, connectedTo, Timber Harvesting>
+<Wood Product Manufacturing, processes, Sustainable Forest Management>
diff --git a/test/graphviz/graph_hard/graphviz_136.txt b/test/graphviz/graph_hard/graphviz_136.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9e5baec34411f3ab91564e824cc9a99c888987d7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_136.txt
@@ -0,0 +1,42 @@
+<Allergy Testing, connectedTo, Euthanasia Services>
+<Allergy Testing, partOf, Allergy Testing>
+<Biosecurity Measures, connectedTo, Post_operative Care>
+<Biosecurity Measures, partOf, Biosecurity Measures>
+<Client Communication, connectedTo, Medical Record Keeping>
+<Client Communication, partOf, Client Communication>
+<Equine Care, connectedTo, Animal Welfare Assessment>
+<Equine Care, connectedTo, Laboratory Testing>
+<Equine Care, connectedTo, Medical Record Keeping>
+<Equine Care, connectedTo, Pet Check_up>
+<Euthanasia Services, connectedTo, Client Communication>
+<Euthanasia Services, partOf, Euthanasia Services>
+<Genetic Counseling for Animals, connectedTo, Vaccination>
+<Genetic Counseling for Animals, partOf, Genetic Counseling for Animals>
+<Hospice Care for Animals, connectedTo, Laboratory Testing>
+<Hospice Care for Animals, connectedTo, Wildlife Rehabilitation>
+<Imaging Services, connectedTo, Animal Welfare Assessment>
+<Imaging Services, connectedTo, Sterilization Protocols>
+<Laboratory Testing, performs, Pet Check_up>
+<Medical Record Keeping, connectedTo, Animal Welfare Assessment>
+<Microchipping, connectedTo, Animal Welfare Assessment>
+<Microchipping, connectedTo, Imaging Services>
+<Microchipping, connectedTo, Medical Record Keeping>
+<Nutritional Counseling, connectedTo, Microchipping>
+<Pet Check_up, connectedTo, Biosecurity Measures>
+<Pet Check_up, connectedTo, Medical Record Keeping>
+<Post_operative Care, connectedTo, Genetic Counseling for Animals>
+<Post_operative Care, partOf, Post_operative Care>
+<Pre_surgical Assessment, connectedTo, Laboratory Testing>
+<Pre_surgical Assessment, connectedTo, Veterinary Technology Training>
+<Sterilization Protocols, connectedTo, Equine Care>
+<Sterilization Protocols, connectedTo, Laboratory Testing>
+<Surgery, connectedTo, Nutritional Counseling>
+<Toxicology Testing, connectedTo, Allergy Testing>
+<Toxicology Testing, connectedTo, Animal Welfare Assessment>
+<Toxicology Testing, connectedTo, Laboratory Testing>
+<Toxicology Testing, connectedTo, Medical Record Keeping>
+<Toxicology Testing, connectedTo, Surgery>
+<Vaccination, connectedTo, Laboratory Testing>
+<Vaccination, partOf, Vaccination>
+<Veterinary Technology Training, connectedTo, Toxicology Testing>
+<Wildlife Rehabilitation, connectedTo, Pre_surgical Assessment>
diff --git a/test/graphviz/graph_hard/graphviz_137.dot b/test/graphviz/graph_hard/graphviz_137.dot
new file mode 100644
index 0000000000000000000000000000000000000000..34a3c2e261a40f4dedc06c21376e452919f33cb6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_137.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Medical Record Keeping" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Wildlife Rehabilitation" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N2 [label="Sterilization Protocols" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N3 [label="Laboratory Testing" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N4 [label="Farm Animal Health Management" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N5 [label="Imaging Services" color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+	N6 [label=Microchipping color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N7 [label="Animal Sheltering Consultation" color="#4FC3F7" fillcolor="#E1F5FE" shape=Mdiamond style=filled]
+	N8 [label=Diagnosis color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N9 [label="Client Communication" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N10 [label="Veterinary Pathology" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+	N11 [label="Nutritional Counseling" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N12 [label="Hospice Care for Animals" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N13 [label="Pharmacy Management" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Spay or Neuter Procedure" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Prescription color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest0_1 [label="Herd Health Programs" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Post_operative Care" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Equine Care" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest1_1 [label="Allergy Testing" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N2 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_137.txt b/test/graphviz/graph_hard/graphviz_137.txt
new file mode 100644
index 0000000000000000000000000000000000000000..514a782e1a80af8c76f3868fcc1a38868d319f2d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_137.txt
@@ -0,0 +1,34 @@
+<Allergy Testing, connectedTo, Client Communication>
+<Allergy Testing, partOf, Allergy Testing>
+<Animal Sheltering Consultation, connectedTo, Diagnosis>
+<Client Communication, connectedTo, Pharmacy Management>
+<Client Communication, connectedTo, Veterinary Pathology>
+<Diagnosis, connectedTo, Client Communication>
+<Equine Care, connectedTo, Allergy Testing>
+<Equine Care, partOf, Equine Care>
+<Farm Animal Health Management, connectedTo, Animal Sheltering Consultation>
+<Farm Animal Health Management, connectedTo, Imaging Services>
+<Herd Health Programs, connectedTo, Sterilization Protocols>
+<Herd Health Programs, partOf, Herd Health Programs>
+<Hospice Care for Animals, connectedTo, Pharmacy Management>
+<Imaging Services, connectedTo, Animal Sheltering Consultation>
+<Imaging Services, connectedTo, Microchipping>
+<Imaging Services, connectedTo, Nutritional Counseling>
+<Imaging Services, connectedTo, Pharmacy Management>
+<Laboratory Testing, connectedTo, Farm Animal Health Management>
+<Medical Record Keeping, connectedTo, Wildlife Rehabilitation>
+<Microchipping, connectedTo, Animal Sheltering Consultation>
+<Nutritional Counseling, connectedTo, Hospice Care for Animals>
+<Nutritional Counseling, connectedTo, Prescription>
+<Prescription, connectedTo, Herd Health Programs>
+<Prescription, partOf, Prescription>
+<Sterilization Protocols, connectedTo, Animal Sheltering Consultation>
+<Sterilization Protocols, connectedTo, Laboratory Testing>
+<Veterinary Pathology, connectedTo, Equine Care>
+<Veterinary Pathology, connectedTo, Nutritional Counseling>
+<Veterinary Pathology, connectedTo, Pharmacy Management>
+<Wildlife Rehabilitation, connectedTo, Animal Sheltering Consultation>
+<Wildlife Rehabilitation, connectedTo, Client Communication>
+<Wildlife Rehabilitation, connectedTo, Farm Animal Health Management>
+<Wildlife Rehabilitation, connectedTo, Hospice Care for Animals>
+<Wildlife Rehabilitation, connectedTo, Sterilization Protocols>
diff --git a/test/graphviz/graph_hard/graphviz_138.dot b/test/graphviz/graph_hard/graphviz_138.dot
new file mode 100644
index 0000000000000000000000000000000000000000..632cce40d3f82e77422affe7efe16d74f93e14fe
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_138.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=BT
+	N0 [label="Genetic Counseling for Animals" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Pre_surgical Assessment" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N2 [label="Client Communication" color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+	N3 [label=Vaccination color="#FBC02D" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N4 [label="Reproductive Services" color="#BA68C8" fillcolor="#F3E5F5" shape=oval style=filled]
+	N5 [label="Herd Health Programs" color="#FBC02D" fillcolor="#FFFDE7" shape=oval style=filled]
+	N6 [label="Nutritional Counseling" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N7 [label="Wildlife Rehabilitation" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N8 [label="Allergy Testing" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Hospice Care for Animals" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Veterinary Pathology" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_1 [label="Laboratory Testing" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_2 [label="Pain Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+		nest0_3 [label="Anesthesia Administration" color="#C2B2F0" fillcolor="#EFE6FF" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=manages color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Pharmacy Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Surgery color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_1 [label="Post_operative Care" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+		nest1_2 [label="Pet Check_up" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=dispenses color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=analyzes color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=bills color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=admits color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_139.txt b/test/graphviz/graph_hard/graphviz_139.txt
new file mode 100644
index 0000000000000000000000000000000000000000..49fe4e92ffff7871187f87ec011570ac1016a440
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_139.txt
@@ -0,0 +1,43 @@
+<After_School Programs, connectedTo, Learning Material Selection>
+<Child Development Assessment, connectedTo, Infant Care>
+<Child Development Assessment, partOf, Child Development Assessment>
+<Child Protection Policies, connectedTo, Daily Activity Reporting>
+<Child Protection Policies, connectedTo, Social Skill Development>
+<Child Protection Policies, connectedTo, Special Needs Accommodation>
+<Child Psychology Application, connectedTo, Curriculum Planning>
+<Child Psychology Application, partOf, Child Psychology Application>
+<Curriculum Planning, connectedTo, Daily Activity Reporting>
+<Curriculum Planning, connectedTo, Nap Time Supervision>
+<Daily Activity Reporting, connectedTo, Individualized Attention>
+<Daily Activity Reporting, connectedTo, Parent Communication>
+<Daily Activity Reporting, connectedTo, Story Time Reading>
+<Early Literacy Programs, connectedTo, Music and Movement Activities>
+<Early Literacy Programs, partOf, Early Literacy Programs>
+<Emotional Support, connectedTo, Curriculum Planning>
+<Emotional Support, connectedTo, Diaper Changing>
+<Emotional Support, connectedTo, Nap Time Supervision>
+<Emotional Support, connectedTo, Safety Supervision>
+<Group Activities Coordination, connectedTo, Child Protection Policies>
+<Group Activities Coordination, connectedTo, Daily Activity Reporting>
+<Group Activities Coordination, connectedTo, Special Needs Accommodation>
+<Individualized Attention, connectedTo, Child Development Assessment>
+<Individualized Attention, partOf, Individualized Attention>
+<Infant Care, connectedTo, Toddler Activities>
+<Infant Care, partOf, Infant Care>
+<Learning Material Selection, connectedTo, Diaper Changing>
+<Learning Material Selection, connectedTo, Nap Time Supervision>
+<Learning Material Selection, connectedTo, Sensory Play>
+<Learning Material Selection, connectedTo, Story Time Reading>
+<Music and Movement Activities, complies, Child Psychology Application>
+<Music and Movement Activities, partOf, Music and Movement Activities>
+<Nap Time Supervision, connectedTo, Daily Activity Reporting>
+<Parent Communication, connectedTo, Early Literacy Programs>
+<Parent Communication, partOf, Parent Communication>
+<Safety Supervision, connectedTo, After_School Programs>
+<Sensory Play, connectedTo, Curriculum Planning>
+<Social Skill Development, connectedTo, Special Needs Accommodation>
+<Special Needs Accommodation, connectedTo, Daily Activity Reporting>
+<Special Needs Accommodation, connectedTo, Emotional Support>
+<Story Time Reading, connectedTo, Diaper Changing>
+<Toddler Activities, connectedTo, Emotional Support>
+<Toddler Activities, partOf, Toddler Activities>
diff --git a/test/graphviz/graph_hard/graphviz_140.txt b/test/graphviz/graph_hard/graphviz_140.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4f7624f90953ee0e52b8ee06d7e9bad004ac9500
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_140.txt
@@ -0,0 +1,32 @@
+<Child Protection Policies, connectedTo, Curriculum Planning>
+<Child Protection Policies, connectedTo, Social Skill Development>
+<Child Psychology Application, connectedTo, Emergency Evacuation Drills>
+<Child Psychology Application, connectedTo, Staff Training and Certification>
+<Creative Arts Activities, connectedTo, Child Psychology Application>
+<Creative Arts Activities, connectedTo, Story Time Reading>
+<Curriculum Planning, connectedTo, Staff Training and Certification>
+<Emergency Evacuation Drills, connectedTo, Emotional Support>
+<Emotional Support, connectedTo, First Aid Administration>
+<First Aid Administration, connectedTo, Child Protection Policies>
+<First Aid Administration, connectedTo, Curriculum Planning>
+<First Aid Administration, connectedTo, Staff Training and Certification>
+<Learning Material Selection, connectedTo, Sensory Play>
+<Learning Material Selection, documents, Staff Training and Certification>
+<Motor Skill Development, connectedTo, Outdoor Play Supervision>
+<Motor Skill Development, partOf, Motor Skill Development>
+<Music and Movement Activities, connectedTo, First Aid Administration>
+<Music and Movement Activities, partOf, Music and Movement Activities>
+<Outdoor Play Supervision, advises, Child Psychology Application>
+<Outdoor Play Supervision, partOf, Outdoor Play Supervision>
+<Playground Safety Inspection, connectedTo, Music and Movement Activities>
+<Playground Safety Inspection, partOf, Playground Safety Inspection>
+<Sensory Play, connectedTo, Child Protection Policies>
+<Sensory Play, connectedTo, Child Psychology Application>
+<Sensory Play, connectedTo, Curriculum Planning>
+<Sensory Play, connectedTo, Staff Training and Certification>
+<Sensory Play, educates, Staff Training and Certification>
+<Sensory Play, organizes, Creative Arts Activities>
+<Social Skill Development, connectedTo, Playground Safety Inspection>
+<Social Skill Development, partOf, Social Skill Development>
+<Story Time Reading, connectedTo, Motor Skill Development>
+<Story Time Reading, partOf, Story Time Reading>
diff --git a/test/graphviz/graph_hard/graphviz_143.dot b/test/graphviz/graph_hard/graphviz_143.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a845aabc814de3cbbe2cefc4be5422e0ccdee846
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_143.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=LR
+	N0 [label="Caregiver Training" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N1 [label="Nursing Care" color="#4DB6AC" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N2 [label="Rehabilitation Support" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="Chronic Disease Management" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N4 [label=Companionship color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N5 [label="Transportation Assistance" color="#CB9BE1" fillcolor="#F2E6F5" shape=folder style=filled]
+	N6 [label="Pain Management" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N7 [label="Nutritional Assessment" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N8 [label="Hospice Care Coordination" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N9 [label="Health Monitoring" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N10 [label="Daily Living Assistance" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N11 [label="Dementia Care" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N12 [label="Emergency Response System Monitoring" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N13 [label="Speech Therapy" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N14 [label="Respite Care" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N15 [label="Long_Term Care Planning" color="#4DB6AC" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N16 [label="Smart Home Integration for Seniors" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N17 [label="Telehealth for Seniors" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Community Resource Connection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Social Engagement Activities" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_1 [label="Memory Care" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_2 [label="Meal Preparation" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_3 [label="Cognitive Stimulation Activities" color="#CB9BE1" fillcolor="#F2E6F5" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=guides color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Safety Assessments" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Legal Aid Referrals" color="#C0CA33" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+		nest1_1 [label="Recreational Activities Planning" color="#C0CA33" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=evaluates color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=advises color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [label=rehabilitates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N16 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label=coordinates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N12 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	M0 -> N16 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N16 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_143.txt b/test/graphviz/graph_hard/graphviz_143.txt
new file mode 100644
index 0000000000000000000000000000000000000000..381b13159328e850e6d5ef74b7b7405fa83a61a9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_143.txt
@@ -0,0 +1,37 @@
+<Caregiver Training, connectedTo, Nursing Care>
+<Chronic Disease Management, connectedTo, Companionship>
+<Cognitive Stimulation Activities, connectedTo, Smart Home Integration for Seniors>
+<Cognitive Stimulation Activities, partOf, Cognitive Stimulation Activities>
+<Companionship, advises, Transportation Assistance>
+<Companionship, connectedTo, Legal Aid Referrals>
+<Companionship, connectedTo, Smart Home Integration for Seniors>
+<Daily Living Assistance, connectedTo, Dementia Care>
+<Dementia Care, connectedTo, Emergency Response System Monitoring>
+<Emergency Response System Monitoring, connectedTo, Respite Care>
+<Emergency Response System Monitoring, connectedTo, Smart Home Integration for Seniors>
+<Emergency Response System Monitoring, connectedTo, Speech Therapy>
+<Emergency Response System Monitoring, connectedTo, Telehealth for Seniors>
+<Health Monitoring, connectedTo, Daily Living Assistance>
+<Hospice Care Coordination, connectedTo, Health Monitoring>
+<Legal Aid Referrals, connectedTo, Recreational Activities Planning>
+<Legal Aid Referrals, partOf, Legal Aid Referrals>
+<Long_Term Care Planning, connectedTo, Smart Home Integration for Seniors>
+<Meal Preparation, guides, Cognitive Stimulation Activities>
+<Meal Preparation, partOf, Meal Preparation>
+<Memory Care, connectedTo, Meal Preparation>
+<Memory Care, partOf, Memory Care>
+<Nursing Care, evaluates, Rehabilitation Support>
+<Nutritional Assessment, connectedTo, Hospice Care Coordination>
+<Pain Management, connectedTo, Nutritional Assessment>
+<Recreational Activities Planning, connectedTo, Transportation Assistance>
+<Recreational Activities Planning, partOf, Recreational Activities Planning>
+<Rehabilitation Support, connectedTo, Chronic Disease Management>
+<Rehabilitation Support, coordinates, Smart Home Integration for Seniors>
+<Respite Care, connectedTo, Long_Term Care Planning>
+<Smart Home Integration for Seniors, connectedTo, Rehabilitation Support>
+<Smart Home Integration for Seniors, connectedTo, Social Engagement Activities>
+<Smart Home Integration for Seniors, rehabilitates, Telehealth for Seniors>
+<Social Engagement Activities, connectedTo, Memory Care>
+<Social Engagement Activities, partOf, Social Engagement Activities>
+<Speech Therapy, connectedTo, Respite Care>
+<Transportation Assistance, connectedTo, Pain Management>
diff --git a/test/graphviz/graph_hard/graphviz_146.txt b/test/graphviz/graph_hard/graphviz_146.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1877928eb16ccaf7c6605e01e1065f80b5d75caa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_146.txt
@@ -0,0 +1,32 @@
+<Cash Transfer Programs, connectedTo, Drone Deployment for Assessment>
+<Cash Transfer Programs, partOf, Cash Transfer Programs>
+<Damage Assessment, connectedTo, Debris Management>
+<Damage Assessment, partOf, Damage Assessment>
+<Debris Management, connectedTo, Volunteer Coordination>
+<Drone Deployment for Assessment, evaluates, Environmental Remediation>
+<Drone Deployment for Assessment, partOf, Drone Deployment for Assessment>
+<Emergency Response, connectedTo, Geographic Information Systems for Disasters>
+<Emergency Response, connectedTo, Hazard Mapping>
+<Environmental Remediation, connectedTo, Hazard Mapping>
+<Environmental Remediation, connectedTo, Vulnerability Analysis>
+<Geographic Information Systems for Disasters, connectedTo, Cash Transfer Programs>
+<Geographic Information Systems for Disasters, connectedTo, Environmental Remediation>
+<Geographic Information Systems for Disasters, connectedTo, Hazard Mapping>
+<Geographic Information Systems for Disasters, connectedTo, Volunteer Coordination>
+<Hazard Mapping, connectedTo, Policy and Legislation Review>
+<International Aid Coordination, connectedTo, Debris Management>
+<International Aid Coordination, connectedTo, Volunteer Coordination>
+<International Aid Coordination, reconstructs, Infrastructure Repair>
+<Medical Aid Deployment, connectedTo, International Aid Coordination>
+<Mitigation Strategies, connectedTo, Recovery Planning>
+<Mitigation Strategies, partOf, Mitigation Strategies>
+<Policy and Legislation Review, connectedTo, Debris Management>
+<Policy and Legislation Review, connectedTo, International Aid Coordination>
+<Policy and Legislation Review, connectedTo, Medical Aid Deployment>
+<Recovery Planning, connectedTo, Resource Mobilization>
+<Recovery Planning, partOf, Recovery Planning>
+<Resource Mobilization, connectedTo, Damage Assessment>
+<Resource Mobilization, partOf, Resource Mobilization>
+<Volunteer Coordination, assesses, Mitigation Strategies>
+<Volunteer Coordination, connectedTo, Infrastructure Repair>
+<Vulnerability Analysis, connectedTo, Hazard Mapping>
diff --git a/test/graphviz/graph_hard/graphviz_147.txt b/test/graphviz/graph_hard/graphviz_147.txt
new file mode 100644
index 0000000000000000000000000000000000000000..26099ee35fe95e6be14a1a57f7ef14bc9feb57ec
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_147.txt
@@ -0,0 +1,32 @@
+<Capacity Building for Local Communities, connectedTo, Climate Change Adaptation for Disasters>
+<Climate Change Adaptation for Disasters, connectedTo, Communication Protocols>
+<Climate Change Adaptation for Disasters, connectedTo, Environmental Remediation>
+<Climate Change Adaptation for Disasters, connectedTo, Geographic Information Systems for Disasters>
+<Climate Change Adaptation for Disasters, connectedTo, Policy and Legislation Review>
+<Climate Change Adaptation for Disasters, connectedTo, Psychosocial Support>
+<Climate Change Adaptation for Disasters, connectedTo, Resource Mobilization>
+<Communication Protocols, connectedTo, Geographic Information Systems for Disasters>
+<Communication Protocols, connectedTo, Policy and Legislation Review>
+<Early Warning Systems, connectedTo, Medical Aid Deployment>
+<Early Warning Systems, partOf, Early Warning Systems>
+<Emergency Drills and Exercises, partOf, Emergency Drills and Exercises>
+<Emergency Drills and Exercises, secures, Infrastructure Repair>
+<Environmental Remediation, connectedTo, Early Warning Systems>
+<Environmental Remediation, connectedTo, Geographic Information Systems for Disasters>
+<Geographic Information Systems for Disasters, connectedTo, Hazard Mapping>
+<Hazard Mapping, trains, Resource Mobilization>
+<Incident Command System, alerts, Vulnerability Analysis>
+<Incident Command System, connectedTo, Geographic Information Systems for Disasters>
+<Infrastructure Repair, connectedTo, Capacity Building for Local Communities>
+<Infrastructure Repair, partOf, Infrastructure Repair>
+<Medical Aid Deployment, connectedTo, Emergency Drills and Exercises>
+<Medical Aid Deployment, partOf, Medical Aid Deployment>
+<Mitigation Strategies, connectedTo, Resource Mobilization>
+<Mitigation Strategies, partOf, Mitigation Strategies>
+<Policy and Legislation Review, mobilizes, Environmental Remediation>
+<Psychosocial Support, connectedTo, Mitigation Strategies>
+<Psychosocial Support, partOf, Psychosocial Support>
+<Vulnerability Analysis, connectedTo, Capacity Building for Local Communities>
+<Vulnerability Analysis, connectedTo, Geographic Information Systems for Disasters>
+<Vulnerability Analysis, connectedTo, Hazard Mapping>
+<Vulnerability Analysis, connectedTo, Resource Mobilization>
diff --git a/test/graphviz/graph_hard/graphviz_150.dot b/test/graphviz/graph_hard/graphviz_150.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2352f7a4ac38a5d573bd94ff11399d68c3eeba8d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_150.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=TD
+	N0 [label="Chaplain Services" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Counter_Terrorism Operations" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N2 [label="Troop Deployment" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N3 [label=Surveillance color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N4 [label="Space Operations" color="#E91E63" fillcolor="#FCE4EC" shape=Mdiamond style=filled]
+	N5 [label="Ground Operations" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N6 [label="Disaster Relief Deployment" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N7 [label="Personnel Management" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N8 [label="Rules of Engagement" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	N9 [label="Specialized Training" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N10 [label="Joint Exercises" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N11 [label="Civil_Military Cooperation" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N12 [label="Counter_Insurgency Operations" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N13 [label="Military Law" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N14 [label="Readiness Assessment" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N15 [label="Peacekeeping Missions" color="#E91E63" fillcolor="#FCE4EC" shape=folder style=filled]
+	N16 [label="Weapon Systems Development" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Operations Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Targeting color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest0_1 [label="Supply Chain Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+		nest0_2 [label="Force Projection" color="#E91E63" fillcolor="#FCE4EC" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Intelligence Gathering" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Defense Procurement" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+		nest1_1 [label="Logistics Support" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_2 [label="Combat Operations" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_3 [label=Demobilization color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=operates color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=surveys color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label=supplies color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N14 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label=develops color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=logistics color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_151.txt b/test/graphviz/graph_hard/graphviz_151.txt
new file mode 100644
index 0000000000000000000000000000000000000000..becef1f042ea95b4bba489d20546accdaf1bcd1d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_151.txt
@@ -0,0 +1,33 @@
+<Air Cargo Logistics, connectedTo, Delay Management>
+<Air Cargo Logistics, partOf, Air Cargo Logistics>
+<Aircraft De_icing, connectedTo, Route Optimization>
+<Aircraft De_icing, partOf, Aircraft De_icing>
+<Aircraft Maintenance, connectedTo, Pilot Training>
+<Aircraft Maintenance, partOf, Aircraft Maintenance>
+<Airport Operations, optimizes, Pilot Training>
+<Airspace Management, connectedTo, Air Cargo Logistics>
+<Airspace Management, partOf, Airspace Management>
+<Cargo Loading, connectedTo, Crew Resource Management>
+<Cargo Loading, connectedTo, Pilot Training>
+<Crew Resource Management, connectedTo, Next_Generation Air Traffic Management>
+<Crew Resource Management, connectedTo, Pilot Training>
+<Crew Resource Management, navigates, Airport Operations>
+<Delay Management, connectedTo, Aircraft Maintenance>
+<Delay Management, partOf, Delay Management>
+<Emergency Procedures Training, connectedTo, Cargo Loading>
+<Emergency Procedures Training, connectedTo, Crew Resource Management>
+<Emergency Procedures Training, connectedTo, Flight Simulation>
+<Emergency Procedures Training, connectedTo, Next_Generation Air Traffic Management>
+<Flight Planning, connectedTo, Unmanned Aerial Vehicle Integration>
+<Flight Simulation, connectedTo, Airspace Management>
+<Flight Simulation, connectedTo, Cargo Loading>
+<Flight Simulation, connectedTo, Flight Planning>
+<Flight Simulation, connectedTo, Pilot Training>
+<Flight Simulation, connectedTo, Remote Tower Operations>
+<Pilot Training, connectedTo, Next_Generation Air Traffic Management>
+<Remote Tower Operations, connectedTo, Aircraft De_icing>
+<Remote Tower Operations, partOf, Remote Tower Operations>
+<Route Optimization, connectedTo, Unmanned Aerial Vehicle Integration>
+<Route Optimization, partOf, Route Optimization>
+<Unmanned Aerial Vehicle Integration, connectedTo, Pilot Training>
+<Unmanned Aerial Vehicle Integration, monitors, Cargo Loading>
diff --git a/test/graphviz/graph_hard/graphviz_153.dot b/test/graphviz/graph_hard/graphviz_153.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f6c88724888ed4e4dcf9d7b1896544c701ccf0e2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_153.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Airport Operations" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N1 [label="Gate Assignment" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N2 [label="Flight Simulation" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N3 [label="Crew Resource Management" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N4 [label="Next_Generation Air Traffic Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N5 [label="Unmanned Aerial Vehicle Integration" color="#FFB2A5" fillcolor="#FFDCD6" shape=plaintext style=filled]
+	N6 [label="Baggage Handling" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+	N7 [label="Flight Planning" color="#FFC085" fillcolor="#FFDAB9" shape=Mdiamond style=filled]
+	N8 [label="Airspace Management" color="#AABEC6" fillcolor="#E0E6E9" shape=octagon style=filled]
+	N9 [label="Runway Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N10 [label="Security Screening" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N11 [label="Regulatory Compliance" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	N12 [label="Ground Support" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N13 [label="Fleet Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N14 [label="Engine Overhaul" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N15 [label="Air Traffic Control" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N16 [label="Cargo Loading" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Avionics Repair" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Pilot Training" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+		nest0_1 [label="Airworthiness Certification" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Remote Tower Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Aircraft Maintenance" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_1 [label="Noise Abatement Procedures" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+		nest1_2 [label="Sustainable Aviation Fuel Development" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [label=secures color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_154.dot b/test/graphviz/graph_hard/graphviz_154.dot
new file mode 100644
index 0000000000000000000000000000000000000000..96961df01d800dc6e0ba9bf6df634a4d72b402aa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_154.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Reverse Geocoding" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Personalized Route Preferences" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+	N2 [label="Lane Guidance" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N3 [label="Navigation Data Update" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N4 [label="Hazard Alerts" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+	N5 [label="Offline Map Support" color="#7E57C2" fillcolor="#EDE7F6" shape=oval style=filled]
+	N6 [label="Traffic Information" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N7 [label="Pedestrian Navigation" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N8 [label="Turn_by_Turn Directions" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N9 [label=Geofencing color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N10 [label="Cycle Route Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N11 [label="Location_Based Services" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N12 [label="Real_Time Re_routing" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N13 [label="Bearing and Distance Calculation" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+	N14 [label="Multi_modal Navigation" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N15 [label="Inertial Navigation System" color="#AB47BC" fillcolor="#F3E5F5" shape=oval style=filled]
+	N16 [label="Points of Interest Search" color="#AB47BC" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N17 [label="ETA Estimation" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N18 [label="Public Transit Navigation" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N19 [label="Terrestrial Navigation" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N20 [label="Marine Charting" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Autonomous Vehicle Navigation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Wearable Device Navigation" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest0_1 [label="Celestial Navigation" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Dead Reckoning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Historical Traffic Data Analysis" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+		nest1_1 [label=Geocoding color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N19 -> N20 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N17 -> nest0_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N18 -> nest1_0 [label=predicts color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N18 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N17 -> S0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N19 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N20 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M2 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_154.txt b/test/graphviz/graph_hard/graphviz_154.txt
new file mode 100644
index 0000000000000000000000000000000000000000..39c42768ddfec58c6f895f3d2733fcc7a2a759de
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_154.txt
@@ -0,0 +1,41 @@
+<Bearing and Distance Calculation, connectedTo, Multi_modal Navigation>
+<Celestial Navigation, connectedTo, Personalized Route Preferences>
+<Celestial Navigation, partOf, Celestial Navigation>
+<Cycle Route Planning, connectedTo, Location_Based Services>
+<ETA Estimation, connectedTo, Marine Charting>
+<ETA Estimation, connectedTo, Public Transit Navigation>
+<ETA Estimation, connectedTo, Terrestrial Navigation>
+<ETA Estimation, connectedTo, Wearable Device Navigation>
+<Geocoding, connectedTo, Public Transit Navigation>
+<Geocoding, partOf, Geocoding>
+<Geofencing, connectedTo, Cycle Route Planning>
+<Geofencing, connectedTo, Location_Based Services>
+<Hazard Alerts, connectedTo, Offline Map Support>
+<Historical Traffic Data Analysis, connectedTo, Geocoding>
+<Historical Traffic Data Analysis, partOf, Historical Traffic Data Analysis>
+<Inertial Navigation System, connectedTo, Points of Interest Search>
+<Lane Guidance, connectedTo, Navigation Data Update>
+<Location_Based Services, connectedTo, Real_Time Re_routing>
+<Multi_modal Navigation, connectedTo, Inertial Navigation System>
+<Navigation Data Update, connectedTo, Hazard Alerts>
+<Navigation Data Update, connectedTo, Inertial Navigation System>
+<Navigation Data Update, connectedTo, Real_Time Re_routing>
+<Offline Map Support, connectedTo, Geofencing>
+<Offline Map Support, connectedTo, Location_Based Services>
+<Offline Map Support, connectedTo, Traffic Information>
+<Pedestrian Navigation, connectedTo, Geofencing>
+<Pedestrian Navigation, connectedTo, Turn_by_Turn Directions>
+<Personalized Route Preferences, connectedTo, Geofencing>
+<Personalized Route Preferences, connectedTo, Lane Guidance>
+<Points of Interest Search, connectedTo, ETA Estimation>
+<Public Transit Navigation, connectedTo, Terrestrial Navigation>
+<Public Transit Navigation, predicts, Historical Traffic Data Analysis>
+<Real_Time Re_routing, connectedTo, Bearing and Distance Calculation>
+<Reverse Geocoding, connectedTo, Geofencing>
+<Reverse Geocoding, connectedTo, Personalized Route Preferences>
+<Terrestrial Navigation, connectedTo, Marine Charting>
+<Traffic Information, connectedTo, Pedestrian Navigation>
+<Turn_by_Turn Directions, connectedTo, Geofencing>
+<Turn_by_Turn Directions, connectedTo, Location_Based Services>
+<Wearable Device Navigation, connectedTo, Celestial Navigation>
+<Wearable Device Navigation, partOf, Wearable Device Navigation>
diff --git a/test/graphviz/graph_hard/graphviz_155.dot b/test/graphviz/graph_hard/graphviz_155.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b03e5164224fad19aad2d2f1764712007fa56d30
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_155.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=TD
+	N0 [label="Real_Time Re_routing" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="Speed Calculation" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N2 [label="Multi_modal Navigation" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N3 [label="Waypoint Setting" color="#4285F4" fillcolor="#D0E0F8" shape=octagon style=filled]
+	N4 [label="Cycle Route Planning" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N5 [label="Hazard Alerts" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N6 [label="Offline Map Support" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N7 [label="Reverse Geocoding" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N8 [label="Digital Compass Integration" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N9 [label="Indoor Navigation" color="#4285F4" fillcolor="#D0E0F8" shape=octagon style=filled]
+	N10 [label="Location_Based Services" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Navigation Data Update" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Lane Guidance" color="#FFCC7A" fillcolor="#FFF6D9" shape=octagon style=filled]
+		nest0_1 [label="Points of Interest Search" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+		nest0_2 [label="Route Calculation" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Wearable Device Navigation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Personalized Route Preferences" color="#4285F4" fillcolor="#D0E0F8" shape=hexagon style=filled]
+		nest1_1 [label="Bearing and Distance Calculation" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_2 [label="Historical Traffic Data Analysis" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=avoids color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=predicts color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=directs color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=transmits color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N3 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N7 [label=secures color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_158.dot b/test/graphviz/graph_hard/graphviz_158.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c5425a356ed4d5a498e71b32d365b018d71e9962
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_158.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="Fused Deposition Modeling" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N1 [label="Custom Part Production" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N2 [label="Mass Customization" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N3 [label="4D Printing" color="#94C0C0" fillcolor="#CADEDE" shape=oval style=filled]
+	N4 [label="Material Selection" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N5 [label="Additive Manufacturing" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N6 [label="Printing Process" color="#EAEFA5" fillcolor="#FDFCEB" shape=diamond style=filled]
+	N7 [label="Educational Applications" color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+	N8 [label="Aerospace Part Production" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+	N9 [label="Intellectual Property Protection for Designs" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N10 [label="On_Demand Production" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+	N11 [label="Rapid Manufacturing" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N12 [label="Print Farm Management" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Support Structure Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Consumer Product Creation" color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+		nest0_1 [label="Scaffolding for Tissue Engineering" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Reverse Engineering with 3D Printing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Multi_Material Printing" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest1_1 [label="Material Research and Development" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=automates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=customizes color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N8 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [label=optimizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_159.dot b/test/graphviz/graph_hard/graphviz_159.dot
new file mode 100644
index 0000000000000000000000000000000000000000..34ef6fc97a937720e0fd6c32a0a7766ab6fd37ac
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_159.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=TD
+	N0 [label="Selective Laser Sintering" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N1 [label="4D Printing" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N2 [label="Material Research and Development" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N3 [label="Educational Applications" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N4 [label="File Format Conversion" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N5 [label="Printing Process" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N6 [label="Direct Metal Laser Sintering" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N7 [label="Scaffolding for Tissue Engineering" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N8 [label="Custom Part Production" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N9 [label="Distributed Manufacturing" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label=Bioprinting labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quality Control" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_1 [label="Print Farm Management" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest0_2 [label=Post_Processing color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label=Stereolithography labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Printing Parameter Optimization" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest1_1 [label="Maintenance and Repair of Printers" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_2 [label="Mass Customization" color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+		nest1_3 [label="Material Selection" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N2 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [label=troubleshoots color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_163.txt b/test/graphviz/graph_hard/graphviz_163.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0724326fc4acd40b3a2e14c54e46e92eb8b3fd89
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_163.txt
@@ -0,0 +1,37 @@
+<Decoherence Mitigation, connectedTo, Optimization Problems with Quantum Annealing>
+<Financial Modeling with Quantum Computing, connectedTo, Interfacing Classical and Quantum Computers>
+<Optimization Problems with Quantum Annealing, connectedTo, Post_Quantum Cryptography>
+<Photonic Qubits, connectedTo, Financial Modeling with Quantum Computing>
+<Photonic Qubits, partOf, Photonic Qubits>
+<Post_Quantum Cryptography, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Algorithm Development, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Algorithm Development, connectedTo, Quantum Communication Protocols>
+<Quantum Algorithm Development, connectedTo, Superconducting Qubits>
+<Quantum Algorithm Development, educates, Trapped Ion Qubits>
+<Quantum Coherence Management, connectedTo, Quantum Entanglement Generation>
+<Quantum Coherence Management, connectedTo, Quantum Programming Languages>
+<Quantum Communication Protocols, connectedTo, Superconducting Qubits>
+<Quantum Communication Protocols, debugs, Trapped Ion Qubits>
+<Quantum Computing Benchmarking, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Computing Benchmarking, connectedTo, Quantum Error Correction>
+<Quantum Computing Education, connectedTo, Quantum Hardware Control>
+<Quantum Computing Education, partOf, Quantum Computing Education>
+<Quantum Computing for AI, connectedTo, Financial Modeling with Quantum Computing>
+<Quantum Computing for AI, connectedTo, Quantum Computing Benchmarking>
+<Quantum Computing for AI, connectedTo, Quantum Computing Education>
+<Quantum Computing for AI, connectedTo, Quantum Error Correction>
+<Quantum Entanglement Generation, connectedTo, Decoherence Mitigation>
+<Quantum Entanglement Generation, connectedTo, Interfacing Classical and Quantum Computers>
+<Quantum Entanglement Generation, connectedTo, Post_Quantum Cryptography>
+<Quantum Entanglement Generation, validates, Trapped Ion Qubits>
+<Quantum Error Correction, connectedTo, Quantum Algorithm Development>
+<Quantum Error Correction, connectedTo, Trapped Ion Qubits>
+<Quantum Hardware Control, connectedTo, Optimization Problems with Quantum Annealing>
+<Quantum Hardware Control, partOf, Quantum Hardware Control>
+<Quantum Programming Languages, connectedTo, Photonic Qubits>
+<Quantum Programming Languages, partOf, Quantum Programming Languages>
+<Quantum Sensing, connectedTo, Quantum Computing for AI>
+<Quantum Sensing, encrypts, Quantum Error Correction>
+<Superconducting Qubits, connectedTo, Quantum Coherence Management>
+<Superconducting Qubits, connectedTo, Trapped Ion Qubits>
+<Trapped Ion Qubits, connectedTo, Decoherence Mitigation>
diff --git a/test/graphviz/graph_hard/graphviz_165.dot b/test/graphviz/graph_hard/graphviz_165.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5c28c929fe1816c40827cc5a38c70a25405cbbb1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_165.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=RL
+	N0 [label="Quantum Computing Benchmarking" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Optimization Problems with Quantum Annealing" color="#00BCD4" fillcolor="#B2EBF2" shape=oval style=filled]
+	N2 [label="Quantum Advantage Demonstration" color="#00BCD4" fillcolor="#B2EBF2" shape=oval style=filled]
+	N3 [label="Photonic Qubits" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N4 [label="Quantum Teleportation Research" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Cryogenic Systems for Qubits" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N6 [label="Decoherence Mitigation" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N7 [label="Post_Quantum Cryptography" color="#00BCD4" fillcolor="#B2EBF2" shape=oval style=filled]
+	N8 [label="Financial Modeling with Quantum Computing" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N9 [label="Quantum Sensing" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N10 [label="Microwave Control for Qubits" color="#FFB74D" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+	N11 [label="Material Science Simulations" color="#FFB74D" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N12 [label="Quantum Computing for AI" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N13 [label="Quantum Simulation" color="#26A69A" fillcolor="#E0F2F1" shape=folder style=filled]
+	N14 [label="Quantum Supremacy Claims" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N15 [label="Quantum Entanglement Generation" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Quantum Error Correction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quantum Computing in Drug Discovery" color="#26A69A" fillcolor="#E0F2F1" shape=plaintext style=filled]
+		nest0_1 [label="Laser Cooling for Ions" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+		nest0_2 [label="Vacuum Systems for Trapped Ions" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_3 [label="Trapped Ion Qubits" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Quantum Annealing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Quantum Key Distribution" color="#26A69A" fillcolor="#E0F2F1" shape=oval style=filled]
+		nest1_1 [label="Interfacing Classical and Quantum Computers" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+		nest1_2 [label="Quantum Coherence Management" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+		nest1_3 [label="Quantum Algorithm Development" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [label=computes color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=tests color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=factors color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=protects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N14 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_167.dot b/test/graphviz/graph_hard/graphviz_167.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2b642d3d56290912124825f71bcdbea7309ea437
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_167.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=TD
+	N0 [label="Headset Development" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N1 [label="User Experience Testing" color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+	N2 [label="Data Visualization in AR or VR" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N3 [label="Augmented Reality App Development" color="#66BB6A" fillcolor="#E8F5E9" shape=folder style=filled]
+	N4 [label="Immersive Storytelling" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N5 [label="AR for Navigation" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N6 [label="Comfort and Ergonomics Design" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N7 [label="Retail Experience Enhancement" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N8 [label="Virtual Tourism Experiences" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+	N9 [label="User Interface Design" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+	N10 [label="Tracking System Calibration" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Performance Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Software Development Kit Integration" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+		nest0_1 [label="Neuro_VR Interfaces" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+		nest0_2 [label="Environment Mapping" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+		nest0_3 [label="Virtual Showrooms" color="#66BB6A" fillcolor="#E8F5E9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=trains color="#388E3C" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Facial Recognition in AR or VR" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="3D Model Creation" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+		nest1_1 [label="Medical Applications" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [label=generates color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=deploys color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label=collaborates color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N6 [label=monitors color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_169.dot b/test/graphviz/graph_hard/graphviz_169.dot
new file mode 100644
index 0000000000000000000000000000000000000000..552650d94ea6f8b4d250c2b51fb21a51bdb04a80
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_169.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Bug Fixing" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N1 [label="Player Progression Systems" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N2 [label="Esports Event Organization" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N3 [label="In_Game Economy Design" color="#66BB6A" fillcolor="#E8F5E9" shape=folder style=filled]
+	N4 [label="Mobile Game Development" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N5 [label="Game Balancing" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N6 [label="Game Publishing" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N7 [label="Player Feedback Integration" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N8 [label="Marketing and Promotion" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N9 [label="Live Operations" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N10 [label="Game Engine Customization" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N11 [label="Physics Simulation" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N12 [label="AI Behavior Programming" color="#B0C5CD" fillcolor="#DFE7EB" shape=octagon style=filled]
+	N13 [label="Sound Design" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+	N14 [label="Voice Acting" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N15 [label="Character Design" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N16 [label="Community Management" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	S0 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Augmented Reality Gaming" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="User Interface Design" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+		nest0_1 [label="Narrative Design" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest0_2 [label="Game Performance Optimization" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest0_3 [label=Storytelling color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Game Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Level Design" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+		nest1_1 [label="Network Code Optimization" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+		nest1_2 [label="Monetization Strategy" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label=organizes color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N13 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest1_0 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N15 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [label=designs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N14 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N16 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> M2 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> M2 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	M2 -> N16 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_169.txt b/test/graphviz/graph_hard/graphviz_169.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7893a570a7fb50df9d1a9a624cb8ffab78eae3fa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_169.txt
@@ -0,0 +1,43 @@
+<AI Behavior Programming, connectedTo, Sound Design>
+<AI Behavior Programming, develops, Community Management>
+<Bug Fixing, connectedTo, Marketing and Promotion>
+<Bug Fixing, connectedTo, Player Progression Systems>
+<Character Design, connectedTo, Community Management>
+<Esports Event Organization, connectedTo, Game Balancing>
+<Esports Event Organization, connectedTo, In_Game Economy Design>
+<Esports Event Organization, connectedTo, Live Operations>
+<Esports Event Organization, designs, Sound Design>
+<Game Balancing, connectedTo, Game Publishing>
+<Game Balancing, connectedTo, Marketing and Promotion>
+<Game Engine Customization, connectedTo, Community Management>
+<Game Engine Customization, connectedTo, Physics Simulation>
+<Game Engine Customization, connectedTo, User Interface Design>
+<Game Performance Optimization, connectedTo, Storytelling>
+<Game Performance Optimization, partOf, Game Performance Optimization>
+<Game Publishing, connectedTo, Player Feedback Integration>
+<In_Game Economy Design, connectedTo, Marketing and Promotion>
+<In_Game Economy Design, connectedTo, Mobile Game Development>
+<Level Design, connectedTo, Network Code Optimization>
+<Level Design, partOf, Level Design>
+<Live Operations, connectedTo, Community Management>
+<Live Operations, connectedTo, Game Engine Customization>
+<Marketing and Promotion, connectedTo, Live Operations>
+<Mobile Game Development, connectedTo, Game Balancing>
+<Monetization Strategy, connectedTo, Character Design>
+<Monetization Strategy, partOf, Monetization Strategy>
+<Narrative Design, connectedTo, Game Performance Optimization>
+<Narrative Design, partOf, Narrative Design>
+<Network Code Optimization, connectedTo, Monetization Strategy>
+<Network Code Optimization, partOf, Network Code Optimization>
+<Physics Simulation, connectedTo, AI Behavior Programming>
+<Physics Simulation, connectedTo, Community Management>
+<Player Feedback Integration, connectedTo, Marketing and Promotion>
+<Player Progression Systems, connectedTo, Esports Event Organization>
+<Sound Design, organizes, Voice Acting>
+<Storytelling, connectedTo, Sound Design>
+<Storytelling, partOf, Storytelling>
+<User Interface Design, connectedTo, Narrative Design>
+<User Interface Design, partOf, User Interface Design>
+<Voice Acting, connectedTo, Character Design>
+<Voice Acting, connectedTo, Community Management>
+<Voice Acting, connectedTo, Level Design>
diff --git a/test/graphviz/graph_hard/graphviz_173.txt b/test/graphviz/graph_hard/graphviz_173.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f7cf78ab54966b13e76d1be78098684f6e704530
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_173.txt
@@ -0,0 +1,33 @@
+<Artist Management, connectedTo, Music Publishing>
+<Artist Management, partOf, Artist Management>
+<Concert Promotion, audits, Music Licensing>
+<Concert Promotion, connectedTo, Lyric Writing>
+<Copyright Management, connectedTo, Music Theory Analysis>
+<Fan Engagement Strategy, connectedTo, Lyric Writing>
+<Fan Engagement Strategy, connectedTo, Music Distribution>
+<Fan Engagement Strategy, connectedTo, Record Label Operations>
+<Fan Engagement Strategy, reviews, Music Publishing>
+<Fan Engagement Strategy, sells, Beat Making>
+<Lyric Writing, connectedTo, Copyright Management>
+<Music Distribution, connectedTo, Royalty Collection>
+<Music Licensing, connectedTo, Fan Engagement Strategy>
+<Music Licensing, connectedTo, Lyric Writing>
+<Music Licensing, connectedTo, Music Distribution>
+<Music Licensing, connectedTo, Music Publishing>
+<Music Licensing, connectedTo, Streaming Platform Management>
+<Music Publishing, connectedTo, Beat Making>
+<Music Publishing, scores, Music Distribution>
+<Music Theory Analysis, connectedTo, Record Label Operations>
+<Music Theory Analysis, manages, Sampling>
+<Music Therapy, connectedTo, Beat Making>
+<Music Therapy, connectedTo, Concert Promotion>
+<Record Label Operations, performs, Music Publishing>
+<Royalty Collection, connectedTo, Beat Making>
+<Sampling, connectedTo, Artist Management>
+<Sampling, partOf, Sampling>
+<Songwriting, connectedTo, Vocal Performance>
+<Songwriting, partOf, Songwriting>
+<Streaming Platform Management, connectedTo, Songwriting>
+<Streaming Platform Management, partOf, Streaming Platform Management>
+<Vocal Performance, connectedTo, Record Label Operations>
+<Vocal Performance, partOf, Vocal Performance>
diff --git a/test/graphviz/graph_hard/graphviz_174.dot b/test/graphviz/graph_hard/graphviz_174.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8dcc0a2182c8f7c75c495d6621cf6c1079aef499
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_174.dot
@@ -0,0 +1,54 @@
+digraph {
+	rankdir=RL
+	N0 [label=Sampling color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label=Ticketing color="#388E3C" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N2 [label="Synthesizer Programming" color="#388E3C" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N3 [label="Merchandise Sales" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+	N4 [label=Recording color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N5 [label="Music Festival Organization" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N6 [label="Digital Audio Workstation Operation" color="#E0E0E0" fillcolor="#EBEBEB" shape=Mdiamond style=filled]
+	N7 [label="Instrumental Performance" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N8 [label="Sound System Design" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label=Mixing labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Vocal Performance" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+		nest0_1 [label="Crowdfunding for Music Projects" color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+		nest0_2 [label="Tour Management" color="#388E3C" fillcolor="#C8E6C9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label=Performance labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Artist Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+		nest1_1 [label="A&R" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_2 [label="Music Licensing" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest1_3 [label="Music Production" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [label=mixes color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_174.txt b/test/graphviz/graph_hard/graphviz_174.txt
new file mode 100644
index 0000000000000000000000000000000000000000..881c25b06186b53f206f00f9cfe372b6ae67160c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_174.txt
@@ -0,0 +1,30 @@
+<A&R, connectedTo, Music Licensing>
+<A&R, partOf, A&R>
+<Artist Management, connectedTo, A&R>
+<Artist Management, partOf, Artist Management>
+<Crowdfunding for Music Projects, connectedTo, Tour Management>
+<Crowdfunding for Music Projects, partOf, Crowdfunding for Music Projects>
+<Digital Audio Workstation Operation, connectedTo, Artist Management>
+<Digital Audio Workstation Operation, connectedTo, Instrumental Performance>
+<Instrumental Performance, connectedTo, Sound System Design>
+<Merchandise Sales, connectedTo, Digital Audio Workstation Operation>
+<Merchandise Sales, connectedTo, Music Festival Organization>
+<Merchandise Sales, connectedTo, Recording>
+<Merchandise Sales, connectedTo, Sound System Design>
+<Music Festival Organization, connectedTo, Digital Audio Workstation Operation>
+<Music Festival Organization, connectedTo, Vocal Performance>
+<Music Licensing, connectedTo, Music Production>
+<Music Licensing, partOf, Music Licensing>
+<Music Production, mixes, Recording>
+<Music Production, partOf, Music Production>
+<Recording, connectedTo, Music Festival Organization>
+<Sampling, connectedTo, Recording>
+<Sampling, connectedTo, Ticketing>
+<Synthesizer Programming, connectedTo, Merchandise Sales>
+<Synthesizer Programming, connectedTo, Recording>
+<Ticketing, connectedTo, Recording>
+<Ticketing, connectedTo, Synthesizer Programming>
+<Tour Management, connectedTo, Recording>
+<Tour Management, partOf, Tour Management>
+<Vocal Performance, connectedTo, Crowdfunding for Music Projects>
+<Vocal Performance, partOf, Vocal Performance>
diff --git a/test/graphviz/graph_hard/graphviz_175.dot b/test/graphviz/graph_hard/graphviz_175.dot
new file mode 100644
index 0000000000000000000000000000000000000000..83d2f7f9fcc70929a1da85b235075eb9d203f8f6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_175.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=TD
+	N0 [label="Audience Research" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="Sound Recording" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N2 [label="Art Direction" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N3 [label="Remote Collaboration Tools" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+	N4 [label="Talent Negotiation" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N5 [label="Production Scheduling" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N6 [label="Film Festival Submission" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+	N7 [label="Green Production Practices" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N8 [label=Casting color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+	N9 [label="Special Effects" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N10 [label="Set Construction" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N11 [label="Costume Design" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N12 [label="Film Financing" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N13 [label="Legal Compliance" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N14 [label=Directing color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N15 [label="Insurance Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S0 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Stunt Coordination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Crew Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_1 [label="Budget Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_2 [label="Film Scoring" color="#A188DB" fillcolor="#DED7F0" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Production Accounting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Storyboarding color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_1 [label="Tax Incentive Management" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=edits color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N13 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest1_0 [label=casts color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N9 -> S0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_175.txt b/test/graphviz/graph_hard/graphviz_175.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c754efce9a7819bfd13bfbad0d38a79968f99508
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_175.txt
@@ -0,0 +1,39 @@
+<Art Direction, connectedTo, Insurance Management>
+<Art Direction, connectedTo, Legal Compliance>
+<Art Direction, connectedTo, Remote Collaboration Tools>
+<Audience Research, connectedTo, Sound Recording>
+<Budget Management, connectedTo, Film Scoring>
+<Budget Management, partOf, Budget Management>
+<Casting, connectedTo, Directing>
+<Casting, connectedTo, Film Financing>
+<Casting, connectedTo, Set Construction>
+<Casting, connectedTo, Special Effects>
+<Costume Design, edits, Film Financing>
+<Crew Management, connectedTo, Budget Management>
+<Crew Management, partOf, Crew Management>
+<Directing, casts, Storyboarding>
+<Directing, connectedTo, Insurance Management>
+<Film Festival Submission, connectedTo, Costume Design>
+<Film Festival Submission, connectedTo, Green Production Practices>
+<Film Financing, connectedTo, Legal Compliance>
+<Film Scoring, connectedTo, Legal Compliance>
+<Film Scoring, partOf, Film Scoring>
+<Green Production Practices, connectedTo, Casting>
+<Legal Compliance, connectedTo, Directing>
+<Production Scheduling, connectedTo, Costume Design>
+<Production Scheduling, connectedTo, Film Festival Submission>
+<Remote Collaboration Tools, connectedTo, Talent Negotiation>
+<Set Construction, connectedTo, Costume Design>
+<Sound Recording, connectedTo, Art Direction>
+<Sound Recording, connectedTo, Crew Management>
+<Special Effects, connectedTo, Costume Design>
+<Special Effects, connectedTo, Directing>
+<Special Effects, connectedTo, Film Financing>
+<Special Effects, connectedTo, Insurance Management>
+<Special Effects, connectedTo, Legal Compliance>
+<Special Effects, connectedTo, Set Construction>
+<Storyboarding, connectedTo, Tax Incentive Management>
+<Storyboarding, partOf, Storyboarding>
+<Talent Negotiation, connectedTo, Production Scheduling>
+<Tax Incentive Management, connectedTo, Green Production Practices>
+<Tax Incentive Management, partOf, Tax Incentive Management>
diff --git a/test/graphviz/graph_hard/graphviz_176.dot b/test/graphviz/graph_hard/graphviz_176.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2d3c9dc08771e79da91c8e7cdc49515d34546411
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_176.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Color Grading" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Production Accounting" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N2 [label="Set Construction" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N3 [label="Crew Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N4 [label=Editing color="#4DB6AC" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N5 [label="Green Production Practices" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N6 [label="Screenwriting Workshops" color="#FFB74D" fillcolor="#FFF3E0" shape=folder style=filled]
+	N7 [label="Pre_production Planning" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N8 [label=Directing color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N9 [label="Post_production Audio" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N10 [label="Tax Incentive Management" color="#61CAC3" fillcolor="#C2E8E6" shape=folder style=filled]
+	N11 [label="Remote Collaboration Tools" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N12 [label="Costume Design" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N13 [label="Art Direction" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Location Scouting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Production Scheduling" color="#FFB74D" fillcolor="#FFF3E0" shape=folder style=filled]
+		nest0_1 [label="Sound Recording" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Film Financing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Storyboarding color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest1_1 [label="Film Scoring" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_2 [label="Budget Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=records color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=captures color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=negotiates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=composes color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label=animates color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=distributes color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_177.dot b/test/graphviz/graph_hard/graphviz_177.dot
new file mode 100644
index 0000000000000000000000000000000000000000..41cbf4e27675ef9f7a61aec5dca5b933663df38a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_177.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Tax Incentive Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N1 [label="Digital Asset Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N2 [label="Production Scheduling" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N3 [label="Prop Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Set Construction" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N5 [label="Virtual Production Techniques" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N6 [label="Pre_production Planning" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N7 [label="Archiving and Preservation" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N8 [label="Special Effects" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N9 [label="Screenwriting Workshops" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N10 [label="Stunt Coordination" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N11 [label="Talent Negotiation" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N12 [label="Green Production Practices" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N13 [label="Post_production Audio" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N14 [label="Color Grading" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N15 [label="Film Scoring" color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+	N16 [label="Location Scouting" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Sound Recording" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Script Development" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest0_1 [label="Makeup and Hair Design" color="#9C27B0" fillcolor="#E1BEE7" shape=folder style=filled]
+		nest0_2 [label="Insurance Management" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_3 [label="Visual Effects" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=markets color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label=Directing labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Budget Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+		nest1_1 [label="Distribution Strategy" color="#A2D0FF" fillcolor="#E8F0FF" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=screens color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=promotes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=directs color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label=licenses color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N8 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N12 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [label=records color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [label=schedules color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	M0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_178.dot b/test/graphviz/graph_hard/graphviz_178.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ad94c2db6b2e86aadcee4eca080797a0fb314969
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_178.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Drafting Content" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Interactive Content Development" color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+	N2 [label="Content Management System Operation" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N3 [label="Live Streaming Content" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N4 [label="Graphic Design" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+	N5 [label="Social Media Post Creation" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N6 [label="E_book Writing" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N7 [label="User_Generated Content Curation" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N8 [label="Influencer Collaboration" color="#AF56A6" fillcolor="#DDCEDD" shape=octagon style=filled]
+	N9 [label="Plagiarism Checking" color="#AF56A6" fillcolor="#DDCEDD" shape=folder style=filled]
+	N10 [label="Content Strategy Development" color="#AF56A6" fillcolor="#DDCEDD" shape=parallelogram style=filled]
+	N11 [label="Blog Post Writing" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N12 [label=Branding color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N13 [label="Newsletter Creation" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+	N14 [label="Monetization Strategy" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N15 [label="Transcribing Audio or Video" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N16 [label="Content Repurposing" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label=Videography labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ideation and Brainstorming" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest0_1 [label="Distribution Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=illustrates color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Search Engine Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Editing and Proofreading" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest1_1 [label="Call to Action Design" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_2 [label="Voice Acting or Narration" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=films color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [label=interviews color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N16 [label=collaborates color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [label=distributes color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_178.txt b/test/graphviz/graph_hard/graphviz_178.txt
new file mode 100644
index 0000000000000000000000000000000000000000..59db5d2ec7cb838ad6107895639e6b7f5fff5b17
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_178.txt
@@ -0,0 +1,35 @@
+<Blog Post Writing, connectedTo, Branding>
+<Branding, connectedTo, Newsletter Creation>
+<Call to Action Design, connectedTo, Voice Acting or Narration>
+<Call to Action Design, partOf, Call to Action Design>
+<Content Management System Operation, connectedTo, Live Streaming Content>
+<Content Strategy Development, connectedTo, Blog Post Writing>
+<Content Strategy Development, distributes, Branding>
+<Distribution Planning, collaborates, Content Repurposing>
+<Distribution Planning, partOf, Distribution Planning>
+<Drafting Content, connectedTo, Interactive Content Development>
+<Drafting Content, connectedTo, Live Streaming Content>
+<E_book Writing, connectedTo, User_Generated Content Curation>
+<Editing and Proofreading, connectedTo, Call to Action Design>
+<Editing and Proofreading, partOf, Editing and Proofreading>
+<Graphic Design, films, Social Media Post Creation>
+<Ideation and Brainstorming, illustrates, Distribution Planning>
+<Ideation and Brainstorming, partOf, Ideation and Brainstorming>
+<Influencer Collaboration, connectedTo, Plagiarism Checking>
+<Interactive Content Development, connectedTo, Content Management System Operation>
+<Interactive Content Development, connectedTo, Live Streaming Content>
+<Live Streaming Content, connectedTo, Branding>
+<Live Streaming Content, connectedTo, Graphic Design>
+<Live Streaming Content, connectedTo, Ideation and Brainstorming>
+<Live Streaming Content, connectedTo, Newsletter Creation>
+<Live Streaming Content, connectedTo, Plagiarism Checking>
+<Monetization Strategy, connectedTo, Transcribing Audio or Video>
+<Newsletter Creation, interviews, Monetization Strategy>
+<Plagiarism Checking, connectedTo, Branding>
+<Plagiarism Checking, connectedTo, Content Strategy Development>
+<Social Media Post Creation, connectedTo, E_book Writing>
+<Transcribing Audio or Video, connectedTo, Content Repurposing>
+<User_Generated Content Curation, connectedTo, Editing and Proofreading>
+<User_Generated Content Curation, connectedTo, Influencer Collaboration>
+<Voice Acting or Narration, connectedTo, User_Generated Content Curation>
+<Voice Acting or Narration, partOf, Voice Acting or Narration>
diff --git a/test/graphviz/graph_hard/graphviz_18.dot b/test/graphviz/graph_hard/graphviz_18.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0df41121f7e2cb0daf079d7901e1c33e474aa20f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_18.dot
@@ -0,0 +1,57 @@
+digraph {
+	rankdir=BT
+	N0 [label=Fueling color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N1 [label="Vehicle Assignment" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N2 [label="Passenger Feedback" color="#FFCC80" fillcolor="#FFF0CC" shape=Mdiamond style=filled]
+	N3 [label="Fleet Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N4 [label="Passenger Boarding Pass Issuance" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N5 [label="Route Diversion" color="#FFCC80" fillcolor="#FFF0CC" shape=Mdiamond style=filled]
+	N6 [label="Driver Allocation" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N7 [label="Delay Alert" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N8 [label=Arrival color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N9 [label="Customs Clearance" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N10 [label="Bus Stop Management" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Platform Assignment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Maintenance Check" color="#FFCC80" fillcolor="#FFF0CC" shape=folder style=filled]
+		nest0_1 [label="Schedule Generation" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Vehicle Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Accident Reconstruction" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_1 [label="Route Optimization" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_2 [label=Boarding color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+		nest1_3 [label="Intermodal Transfer" color="#FFCC80" fillcolor="#FFF0CC" shape=folder style=filled]
+		nest1_0 -> nest1_1 [label=maintains color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N3 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_18.txt b/test/graphviz/graph_hard/graphviz_18.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9ce760fa3462af31242b596ed9bf667471041e43
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_18.txt
@@ -0,0 +1,31 @@
+<Accident Reconstruction, maintains, Route Optimization>
+<Accident Reconstruction, partOf, Accident Reconstruction>
+<Arrival, connectedTo, Accident Reconstruction>
+<Arrival, connectedTo, Customs Clearance>
+<Boarding, connectedTo, Intermodal Transfer>
+<Boarding, connectedTo, Route Diversion>
+<Boarding, partOf, Boarding>
+<Customs Clearance, connectedTo, Bus Stop Management>
+<Customs Clearance, connectedTo, Maintenance Check>
+<Delay Alert, connectedTo, Arrival>
+<Driver Allocation, connectedTo, Bus Stop Management>
+<Driver Allocation, connectedTo, Customs Clearance>
+<Driver Allocation, connectedTo, Delay Alert>
+<Fleet Management, connectedTo, Passenger Boarding Pass Issuance>
+<Fueling, connectedTo, Fleet Management>
+<Fueling, connectedTo, Vehicle Assignment>
+<Intermodal Transfer, connectedTo, Fleet Management>
+<Intermodal Transfer, partOf, Intermodal Transfer>
+<Maintenance Check, connectedTo, Schedule Generation>
+<Maintenance Check, partOf, Maintenance Check>
+<Passenger Boarding Pass Issuance, connectedTo, Route Diversion>
+<Passenger Feedback, connectedTo, Delay Alert>
+<Passenger Feedback, connectedTo, Fleet Management>
+<Route Diversion, connectedTo, Driver Allocation>
+<Route Optimization, connectedTo, Boarding>
+<Route Optimization, partOf, Route Optimization>
+<Schedule Generation, connectedTo, Route Diversion>
+<Schedule Generation, partOf, Schedule Generation>
+<Vehicle Assignment, connectedTo, Bus Stop Management>
+<Vehicle Assignment, connectedTo, Fleet Management>
+<Vehicle Assignment, connectedTo, Passenger Feedback>
diff --git a/test/graphviz/graph_hard/graphviz_180.dot b/test/graphviz/graph_hard/graphviz_180.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5432e625f4b9007ffb5364a077e020030ff56950
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_180.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Audience Engagement" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Transcribing Audio or Video" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+	N2 [label="User_Generated Content Curation" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N3 [label="Video Scripting" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N4 [label="Distribution Planning" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N5 [label="Newsletter Creation" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N6 [label="Webinar Hosting" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N7 [label="Research and Outline" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N8 [label="Call to Action Design" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N9 [label="E_book Writing" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N10 [label="Content Strategy Development" color="#64B5F6" fillcolor="#E3F2FD" shape=octagon style=filled]
+	N11 [label="Content Localization" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+	N12 [label="Interactive Content Development" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N13 [label="Keyword Research" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N14 [label=Animation color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N15 [label="Plagiarism Checking" color="#E57373" fillcolor="#FFEBEE" shape=oval style=filled]
+	N16 [label="Audio Recording" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N17 [label="Content Management System Operation" color="#FFE69C" fillcolor="#FFF9D4" shape=octagon style=filled]
+	N18 [label=Fact_Checking color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Graphic Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Search Engine Optimization" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest0_1 [label=Branding color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+		nest0_2 [label="Podcast Production" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+		nest0_3 [label="Drafting Content" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Voice Acting or Narration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Photography color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest1_1 [label="Influencer Collaboration" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N10 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N13 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N15 -> S1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_181.dot b/test/graphviz/graph_hard/graphviz_181.dot
new file mode 100644
index 0000000000000000000000000000000000000000..023296d5dc6bd8c9a0cd8db5cb82e8a55a26a044
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_181.dot
@@ -0,0 +1,53 @@
+digraph {
+	rankdir=LR
+	N0 [label="Sentiment Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Natural Language Processing for Data" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N2 [label="Big Data Processing" color="#FFD54F" fillcolor="#FFF8E1" shape=octagon style=filled]
+	N3 [label="Supply Chain Analytics" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N4 [label="Data Warehouse Design" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N5 [label="Prescriptive Analytics" color="#FFD54F" fillcolor="#FFF8E1" shape=diamond style=filled]
+	N6 [label="Data Mining" color="#FFD54F" fillcolor="#FFF8E1" shape=diamond style=filled]
+	N7 [label="Marketing Campaign Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Data Cleaning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Time Series Forecasting" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest0_1 [label="Real_time Analytics" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+		nest0_2 [label="Data Pipeline Development" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest0_3 [label="Healthcare Data Analysis" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Data Storytelling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Machine Learning Integration" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+		nest1_1 [label="Data Transformation" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+		nest1_2 [label="Data Visualization" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=secures color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N4 [label=integrates color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=accesses color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N7 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_182.dot b/test/graphviz/graph_hard/graphviz_182.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5a956588c52ced0ae91e5d33fc6347271e2b3305
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_182.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=RL
+	N0 [label="Natural Language Processing for Data" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N1 [label="ETL Process Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N2 [label="HR Data Analytics" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N3 [label="Predictive Analytics" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N4 [label="Data Warehouse Design" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N5 [label="Data Security Best Practices" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N6 [label="Data Governance" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N7 [label="Business User Training on Analytics" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N8 [label="Data Pipeline Development" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N9 [label="Big Data Processing" color="#795548" fillcolor="#D7CCC8" shape=octagon style=filled]
+	N10 [label="Geospatial Analysis" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N11 [label="Operational Efficiency Metrics" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N12 [label="Time Series Forecasting" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N13 [label="Social Media Analytics" color="#CFCFCF" fillcolor="#F6F6F6" shape=octagon style=filled]
+	N14 [label="A or B Testing Analysis" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Text Analytics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Sentiment Analysis" color="#FFCC80" fillcolor="#FFF0CC" shape=oval style=filled]
+		nest0_1 [label="Marketing Campaign Analysis" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+		nest0_2 [label="Exploratory Data Analysis" color="#795548" fillcolor="#D7CCC8" shape=Mdiamond style=filled]
+		nest0_3 [label="Prescriptive Analytics" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#795548" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#795548" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Financial Data Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Healthcare Data Analysis" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest1_1 [label="Data Storytelling" color="#FFCC80" fillcolor="#FFF0CC" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N14 [label=optimizes color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N4 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [label=governs color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_183.dot b/test/graphviz/graph_hard/graphviz_183.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8e72abefc0eb3fefcbe09ebc64aa7cb8482a46f2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_183.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=TD
+	N0 [label="Data Quality Assurance" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Data Cleaning" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N2 [label="Natural Language Processing for Data" color="#607D8B" fillcolor="#CFD8DC" shape=oval style=filled]
+	N3 [label="Data Storytelling" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N4 [label="ETL Process Management" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N5 [label="Data Governance" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N6 [label="Web Analytics" color="#607D8B" fillcolor="#CFD8DC" shape=plaintext style=filled]
+	N7 [label="Marketing Campaign Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N8 [label="Sentiment Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=parallelogram style=filled]
+	N9 [label="Report Generation" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+	N10 [label="Real_time Analytics" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N11 [label="Sales Performance Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N12 [label="Customer Analytics" color="#FF9800" fillcolor="#FFE0B2" shape=octagon style=filled]
+	N13 [label="Prescriptive Analytics" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N14 [label="HR Data Analytics" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N15 [label="Text Analytics" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	S0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Cloud_based Data Platforms" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Data Transformation" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+		nest0_1 [label="Big Data Processing" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Time Series Forecasting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Social Media Analytics" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest1_1 [label="Data Collection" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest1_2 [label="Exploratory Data Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [label=monitors color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=pipelines color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=reports color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=queries color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=secures color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N4 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [label=audits color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=cleans color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> M0 [label=forecasts color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_183.txt b/test/graphviz/graph_hard/graphviz_183.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6308a0546bd6a9c9b480d326e22038afafed4968
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_183.txt
@@ -0,0 +1,37 @@
+<Big Data Processing, connectedTo, HR Data Analytics>
+<Big Data Processing, partOf, Big Data Processing>
+<Customer Analytics, secures, Prescriptive Analytics>
+<Data Cleaning, cleans, HR Data Analytics>
+<Data Cleaning, connectedTo, Natural Language Processing for Data>
+<Data Cleaning, connectedTo, Web Analytics>
+<Data Collection, connectedTo, Exploratory Data Analysis>
+<Data Collection, partOf, Data Collection>
+<Data Governance, connectedTo, Web Analytics>
+<Data Quality Assurance, connectedTo, Data Cleaning>
+<Data Storytelling, connectedTo, ETL Process Management>
+<Data Transformation, connectedTo, Big Data Processing>
+<Data Transformation, partOf, Data Transformation>
+<ETL Process Management, connectedTo, Data Governance>
+<ETL Process Management, connectedTo, Social Media Analytics>
+<Exploratory Data Analysis, connectedTo, ETL Process Management>
+<Exploratory Data Analysis, partOf, Exploratory Data Analysis>
+<HR Data Analytics, connectedTo, Text Analytics>
+<Marketing Campaign Analysis, connectedTo, HR Data Analytics>
+<Marketing Campaign Analysis, connectedTo, Sentiment Analysis>
+<Natural Language Processing for Data, connectedTo, Data Storytelling>
+<Natural Language Processing for Data, connectedTo, Web Analytics>
+<Prescriptive Analytics, connectedTo, HR Data Analytics>
+<Real_time Analytics, audits, HR Data Analytics>
+<Real_time Analytics, connectedTo, Customer Analytics>
+<Real_time Analytics, connectedTo, Prescriptive Analytics>
+<Real_time Analytics, reports, Sales Performance Analysis>
+<Report Generation, connectedTo, Real_time Analytics>
+<Sales Performance Analysis, connectedTo, Data Transformation>
+<Sales Performance Analysis, forecasts, HR Data Analytics>
+<Sales Performance Analysis, queries, Customer Analytics>
+<Sentiment Analysis, connectedTo, Prescriptive Analytics>
+<Sentiment Analysis, connectedTo, Report Generation>
+<Sentiment Analysis, connectedTo, Sales Performance Analysis>
+<Social Media Analytics, monitors, Data Collection>
+<Social Media Analytics, partOf, Social Media Analytics>
+<Web Analytics, pipelines, Marketing Campaign Analysis>
diff --git a/test/graphviz/graph_hard/graphviz_184.dot b/test/graphviz/graph_hard/graphviz_184.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b42c82314d0f8abeb1512a9c7a7bf47f91c98ea5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_184.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="Customer Behavior Insights" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Real_time BI Dashboards" color="#388E3C" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N2 [label="Regulatory Compliance Reporting" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N3 [label="Data Modeling" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N4 [label="Cloud BI Solutions" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N5 [label="Performance Monitoring" color="#FFD54F" fillcolor="#FFF8E1" shape=oval style=filled]
+	N6 [label="Data Quality Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N7 [label="Prescriptive Analytics Implementation" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N8 [label="Self_Service BI Tools" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N9 [label="Data Mart Design" color="#388E3C" fillcolor="#C8E6C9" shape=oval style=filled]
+	N10 [label="Supply Chain Optimization" color="#FFB2A5" fillcolor="#FFDCD6" shape=Mdiamond style=filled]
+	N11 [label="Data Storytelling for Business" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N12 [label="Risk Assessment Reporting" color="#388E3C" fillcolor="#C8E6C9" shape=plaintext style=filled]
+	N13 [label="Budget Performance Analysis" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Mobile BI Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Operational Efficiency Measurement" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_1 [label="Query Optimization" color="#FFD54F" fillcolor="#FFF8E1" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Data Source Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Business Process Improvement" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+		nest1_1 [label="Sales Forecasting" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=processes color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N6 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_184.txt b/test/graphviz/graph_hard/graphviz_184.txt
new file mode 100644
index 0000000000000000000000000000000000000000..446bd5a0f6633eeeec90ef795a7631d026c12d11
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_184.txt
@@ -0,0 +1,30 @@
+<Business Process Improvement, connectedTo, Sales Forecasting>
+<Business Process Improvement, partOf, Business Process Improvement>
+<Cloud BI Solutions, connectedTo, Performance Monitoring>
+<Customer Behavior Insights, connectedTo, Real_time BI Dashboards>
+<Data Mart Design, processes, Supply Chain Optimization>
+<Data Modeling, connectedTo, Cloud BI Solutions>
+<Data Modeling, connectedTo, Performance Monitoring>
+<Data Quality Management, connectedTo, Prescriptive Analytics Implementation>
+<Data Storytelling for Business, connectedTo, Operational Efficiency Measurement>
+<Data Storytelling for Business, connectedTo, Risk Assessment Reporting>
+<Operational Efficiency Measurement, connectedTo, Query Optimization>
+<Operational Efficiency Measurement, partOf, Operational Efficiency Measurement>
+<Performance Monitoring, connectedTo, Budget Performance Analysis>
+<Performance Monitoring, connectedTo, Data Mart Design>
+<Performance Monitoring, connectedTo, Data Quality Management>
+<Performance Monitoring, connectedTo, Data Storytelling for Business>
+<Performance Monitoring, connectedTo, Prescriptive Analytics Implementation>
+<Performance Monitoring, connectedTo, Supply Chain Optimization>
+<Prescriptive Analytics Implementation, connectedTo, Self_Service BI Tools>
+<Query Optimization, connectedTo, Data Quality Management>
+<Query Optimization, partOf, Query Optimization>
+<Real_time BI Dashboards, connectedTo, Regulatory Compliance Reporting>
+<Regulatory Compliance Reporting, connectedTo, Business Process Improvement>
+<Regulatory Compliance Reporting, connectedTo, Data Modeling>
+<Regulatory Compliance Reporting, connectedTo, Performance Monitoring>
+<Risk Assessment Reporting, connectedTo, Budget Performance Analysis>
+<Sales Forecasting, connectedTo, Cloud BI Solutions>
+<Sales Forecasting, partOf, Sales Forecasting>
+<Self_Service BI Tools, connectedTo, Data Mart Design>
+<Supply Chain Optimization, connectedTo, Data Storytelling for Business>
diff --git a/test/graphviz/graph_hard/graphviz_186.txt b/test/graphviz/graph_hard/graphviz_186.txt
new file mode 100644
index 0000000000000000000000000000000000000000..123adcfcafc8b481fcc862a467fd3a9affd266bf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_186.txt
@@ -0,0 +1,34 @@
+<BI Platform Administration, connectedTo, Data Source Integration>
+<Cloud BI Solutions, connectedTo, BI Platform Administration>
+<Cloud BI Solutions, connectedTo, Data Source Integration>
+<Cloud BI Solutions, connectedTo, Data Storytelling for Business>
+<Competitive Analysis, complies, Mobile BI Development>
+<Competitive Analysis, connectedTo, Risk Assessment Reporting>
+<Customer Behavior Insights, connectedTo, Data Security in BI>
+<Customer Behavior Insights, partOf, Customer Behavior Insights>
+<Dashboard Design, compares, Risk Assessment Reporting>
+<Dashboard Design, partOf, Dashboard Design>
+<Data Lineage Tracking, connectedTo, Dashboard Design>
+<Data Lineage Tracking, partOf, Data Lineage Tracking>
+<Data Quality Management, connectedTo, Customer Behavior Insights>
+<Data Quality Management, partOf, Data Quality Management>
+<Data Security in BI, connectedTo, Data Storytelling for Business>
+<Data Security in BI, partOf, Data Security in BI>
+<Data Source Integration, connectedTo, Data Storytelling for Business>
+<Data Warehousing, connectedTo, Operational Efficiency Measurement>
+<Data Warehousing, connectedTo, Strategic Planning Support>
+<Embedded Analytics, ETLs, HR Analytics Dashboards>
+<Embedded Analytics, plans, Risk Assessment Reporting>
+<HR Analytics Dashboards, manages, Risk Assessment Reporting>
+<Mobile BI Development, connectedTo, Strategic Planning Support>
+<OLAP Cube Creation, connectedTo, Competitive Analysis>
+<Operational Efficiency Measurement, connectedTo, Performance Monitoring>
+<Operational Efficiency Measurement, connectedTo, Supply Chain Optimization>
+<Performance Monitoring, connectedTo, Data Lineage Tracking>
+<Performance Monitoring, partOf, Performance Monitoring>
+<Regulatory Compliance Reporting, connectedTo, Data Quality Management>
+<Regulatory Compliance Reporting, connectedTo, Embedded Analytics>
+<Risk Assessment Reporting, connectedTo, Cloud BI Solutions>
+<Strategic Planning Support, connectedTo, Regulatory Compliance Reporting>
+<Supply Chain Optimization, connectedTo, OLAP Cube Creation>
+<Supply Chain Optimization, connectedTo, Strategic Planning Support>
diff --git a/test/graphviz/graph_hard/graphviz_188.dot b/test/graphviz/graph_hard/graphviz_188.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ca3568e1b86caa63ec076cf2ec00e59c8eb33077
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_188.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=LR
+	N0 [label="Search Engine Marketing" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N1 [label="Marketing Analytics" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N2 [label="Email Marketing" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N3 [label="Influencer Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N4 [label="Target Audience Identification" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+	N5 [label=Telemarketing color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N6 [label="Direct Mail Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N7 [label="Search Engine Optimization" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N8 [label="Affiliate Marketing" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+	N9 [label="Campaign Performance Tracking" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Podcast Marketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Personalization Strategies" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest0_1 [label="Partnership Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_2 [label="Content Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+		nest0_3 [label="Social Media Marketing" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Brand Strategy Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Marketing Automation" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_1 [label="Loyalty Programs" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+		nest1_2 [label="Guerilla Marketing" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+		nest1_3 [label="Brand Reputation Management" color="#92C79A" fillcolor="#E8F0EA" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="direct mail" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_188.txt b/test/graphviz/graph_hard/graphviz_188.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bcc221b575895f97ab4c8bbfe94f0c1551560cfd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_188.txt
@@ -0,0 +1,35 @@
+<Affiliate Marketing, connectedTo, Campaign Performance Tracking>
+<Affiliate Marketing, connectedTo, Personalization Strategies>
+<Brand Reputation Management, connectedTo, Affiliate Marketing>
+<Brand Reputation Management, partOf, Brand Reputation Management>
+<Content Marketing, connectedTo, Social Media Marketing>
+<Content Marketing, partOf, Content Marketing>
+<Direct Mail Marketing, connectedTo, Marketing Automation>
+<Direct Mail Marketing, connectedTo, Search Engine Optimization>
+<Email Marketing, connectedTo, Affiliate Marketing>
+<Email Marketing, connectedTo, Campaign Performance Tracking>
+<Email Marketing, connectedTo, Direct Mail Marketing>
+<Email Marketing, connectedTo, Influencer Marketing>
+<Guerilla Marketing, connectedTo, Brand Reputation Management>
+<Guerilla Marketing, partOf, Guerilla Marketing>
+<Influencer Marketing, connectedTo, Affiliate Marketing>
+<Influencer Marketing, connectedTo, Direct Mail Marketing>
+<Influencer Marketing, connectedTo, Target Audience Identification>
+<Loyalty Programs, connectedTo, Guerilla Marketing>
+<Loyalty Programs, partOf, Loyalty Programs>
+<Marketing Analytics, connectedTo, Affiliate Marketing>
+<Marketing Analytics, connectedTo, Direct Mail Marketing>
+<Marketing Analytics, connectedTo, Email Marketing>
+<Marketing Automation, connectedTo, Loyalty Programs>
+<Marketing Automation, partOf, Marketing Automation>
+<Partnership Marketing, connectedTo, Content Marketing>
+<Partnership Marketing, partOf, Partnership Marketing>
+<Personalization Strategies, connectedTo, Partnership Marketing>
+<Personalization Strategies, partOf, Personalization Strategies>
+<Search Engine Marketing, connectedTo, Affiliate Marketing>
+<Search Engine Marketing, direct mail, Marketing Analytics>
+<Search Engine Optimization, connectedTo, Affiliate Marketing>
+<Social Media Marketing, connectedTo, Direct Mail Marketing>
+<Social Media Marketing, partOf, Social Media Marketing>
+<Target Audience Identification, connectedTo, Telemarketing>
+<Telemarketing, connectedTo, Direct Mail Marketing>
diff --git a/test/graphviz/graph_hard/graphviz_190.dot b/test/graphviz/graph_hard/graphviz_190.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f2312cda5897cc66de1ce4951b101afcabec4f57
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_190.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=RL
+	N0 [label="Conversion Tracking" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Outdoor Advertising" color="#E57373" fillcolor="#FFEBEE" shape=oval style=filled]
+	N2 [label="Programmatic Advertising" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N3 [label="Media Buying" color="#E57373" fillcolor="#FFEBEE" shape=plaintext style=filled]
+	N4 [label=Geo_Targeting color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N5 [label="Digital Advertising" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N6 [label="A or B Testing for Ads" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N7 [label="Search Engine Ads" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N8 [label="Social Media Ads" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N9 [label="Audience Targeting" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N10 [label="Demographic Targeting" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N11 [label="Ad Creative Development" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N12 [label="Audience Segmentation for Ads" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N13 [label="Ad Copywriting" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Campaign Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Customer Acquisition Cost Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_1 [label="Video Advertising" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest0_2 [label="Budget Management" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Direct Response Campaigns" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Competitor Ad Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest1_1 [label="Psychographic Targeting" color="#FFF9AE" fillcolor="#FFFCE6" shape=folder style=filled]
+		nest1_2 [label="Television Advertising" color="#FFF9AE" fillcolor="#FFFCE6" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_191.txt b/test/graphviz/graph_hard/graphviz_191.txt
new file mode 100644
index 0000000000000000000000000000000000000000..598475630c81504a94476292d79df96f3ffa4d9f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_191.txt
@@ -0,0 +1,38 @@
+<A or B Testing for Ads, connectedTo, Ad Creative Development>
+<A or B Testing for Ads, connectedTo, Brand Awareness Campaigns>
+<A or B Testing for Ads, connectedTo, Regulatory Compliance for Ads>
+<Ad Analytics Reporting, connectedTo, Radio Advertising>
+<Ad Creative Development, connectedTo, Regulatory Compliance for Ads>
+<Brand Awareness Campaigns, connectedTo, Geo_Targeting>
+<Campaign Planning, connectedTo, Search Engine Ads>
+<Campaign Planning, partOf, Campaign Planning>
+<Conversion Tracking, partOf, Conversion Tracking>
+<Conversion Tracking, programmatic ads, Outdoor Advertising>
+<Demographic Targeting, connectedTo, Geo_Targeting>
+<Demographic Targeting, partOf, Demographic Targeting>
+<Display Advertising, connectedTo, Visual Design for Ads>
+<Display Advertising, partOf, Display Advertising>
+<Geo_Targeting, connectedTo, Media Buying>
+<Geo_Targeting, connectedTo, Native Advertising>
+<Geo_Targeting, connectedTo, Radio Advertising>
+<Media Buying, connectedTo, Ad Creative Development>
+<Media Buying, connectedTo, Native Advertising>
+<Media Buying, connectedTo, Print Advertising>
+<Media Buying, connectedTo, Radio Advertising>
+<Media Buying, connectedTo, Regulatory Compliance for Ads>
+<Media Buying, interprets analytics, Campaign Planning>
+<Native Advertising, connectedTo, Radio Advertising>
+<Native Advertising, designs interactive ads, Print Advertising>
+<Native Advertising, generates responses, Ad Analytics Reporting>
+<Outdoor Advertising, connectedTo, Native Advertising>
+<Outdoor Advertising, partOf, Outdoor Advertising>
+<Print Advertising, connectedTo, Ad Analytics Reporting>
+<Print Advertising, connectedTo, Display Advertising>
+<Privacy Concerns in Ads, builds awareness, A or B Testing for Ads>
+<Privacy Concerns in Ads, connectedTo, Ad Creative Development>
+<Privacy Concerns in Ads, connectedTo, Regulatory Compliance for Ads>
+<Regulatory Compliance for Ads, connectedTo, Native Advertising>
+<Search Engine Ads, connectedTo, Conversion Tracking>
+<Search Engine Ads, partOf, Search Engine Ads>
+<Visual Design for Ads, connectedTo, Demographic Targeting>
+<Visual Design for Ads, partOf, Visual Design for Ads>
diff --git a/test/graphviz/graph_hard/graphviz_193.txt b/test/graphviz/graph_hard/graphviz_193.txt
new file mode 100644
index 0000000000000000000000000000000000000000..900ece6c90468141e3701e7a6d04c5d4203533b8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_193.txt
@@ -0,0 +1,37 @@
+<Blockchain Node Operation, connectedTo, Cross_Border Payments>
+<Blockchain Node Operation, connectedTo, Financial Asset Tokenization>
+<Blockchain Node Operation, connectedTo, Security Auditing for Blockchains>
+<Blockchain Node Operation, connectedTo, Sharding Implementation>
+<Consensus Mechanism Development, connectedTo, Energy Trading on Blockchain>
+<Consensus Mechanism Development, connectedTo, Sharding Implementation>
+<Consortium Blockchain Setup, connectedTo, Enterprise Blockchain Solutions>
+<Consortium Blockchain Setup, partOf, Consortium Blockchain Setup>
+<Cross_Border Payments, connectedTo, Sharding Implementation>
+<Distributed Ledger Technology, connectedTo, Identity Verification on Blockchain>
+<Distributed Ledger Technology, partOf, Distributed Ledger Technology>
+<Energy Trading on Blockchain, connectedTo, Blockchain Node Operation>
+<Energy Trading on Blockchain, connectedTo, Public Blockchain Deployment>
+<Enterprise Blockchain Solutions, connectedTo, Zero_Knowledge Proofs>
+<Enterprise Blockchain Solutions, partOf, Enterprise Blockchain Solutions>
+<Financial Asset Tokenization, connectedTo, Private Blockchain Implementation>
+<Financial Asset Tokenization, connectedTo, Sharding Implementation>
+<Governance Models for Blockchains, connectedTo, Cross_Border Payments>
+<Governance Models for Blockchains, connectedTo, Non_Fungible Token Creation>
+<Governance Models for Blockchains, connectedTo, Security Auditing for Blockchains>
+<Governance Models for Blockchains, connectedTo, Sharding Implementation>
+<Identity Verification on Blockchain, connectedTo, Public Blockchain Deployment>
+<Identity Verification on Blockchain, partOf, Identity Verification on Blockchain>
+<Interoperability Solutions, connectedTo, Blockchain Node Operation>
+<Interoperability Solutions, connectedTo, Distributed Ledger Technology>
+<Private Blockchain Implementation, connectedTo, Consortium Blockchain Setup>
+<Private Blockchain Implementation, connectedTo, Governance Models for Blockchains>
+<Public Blockchain Deployment, connectedTo, Blockchain Node Operation>
+<Public Blockchain Deployment, connectedTo, Interoperability Solutions>
+<Security Auditing for Blockchains, connectedTo, Non_Fungible Token Creation>
+<Sharding Implementation, connectedTo, Security Auditing for Blockchains>
+<Voting Systems on Blockchain, connectedTo, Private Blockchain Implementation>
+<Voting Systems on Blockchain, partOf, Voting Systems on Blockchain>
+<Wallet Management, connectedTo, Blockchain Node Operation>
+<Wallet Management, manages real estate, Consensus Mechanism Development>
+<Zero_Knowledge Proofs, connectedTo, Voting Systems on Blockchain>
+<Zero_Knowledge Proofs, partOf, Zero_Knowledge Proofs>
diff --git a/test/graphviz/graph_hard/graphviz_195.dot b/test/graphviz/graph_hard/graphviz_195.dot
new file mode 100644
index 0000000000000000000000000000000000000000..96b60adff5138c375b4e99ee03653f10db761c2f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_195.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Cross_Chain Bridges" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Security Token Offerings" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N2 [label="Intellectual Property Management" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N3 [label="Zero_Knowledge Proofs" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+	N4 [label="Decentralized Applications Development" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N5 [label="Sidechains and Layer 2 Solutions" color="#66BB6A" fillcolor="#E8F5E9" shape=octagon style=filled]
+	N6 [label="Decentralized Finance Protocols" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N7 [label="Tokenomics Design" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N8 [label="Oracles Integration" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+	N9 [label="Enterprise Blockchain Solutions" color="#66BB6A" fillcolor="#E8F5E9" shape=octagon style=filled]
+	N10 [label="Financial Asset Tokenization" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N11 [label="Voting Systems on Blockchain" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N12 [label="Healthcare Data Management" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N13 [label="Public Blockchain Deployment" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N14 [label="Blockchain Node Operation" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N15 [label="Decentralized Network Design" color="#AABEC6" fillcolor="#E0E6E9" shape=folder style=filled]
+	N16 [label="Cross_Border Payments" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_0 [label="Consensus Mechanism Development" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest0_1 [label="Non_Fungible Token Creation" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
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+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Gaming on Blockchain" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Real Estate Tokenization" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+		nest1_1 [label="Regulatory Compliance for Blockchain" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+		nest1_2 [label="Mining Operations" color="#AABEC6" fillcolor="#E0E6E9" shape=plaintext style=filled]
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+		nest1_1 -> nest1_2 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="uses ZKPs" color="#AED581" dir=forward penwidth=1.5 style=dashed]
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+	N3 -> N4 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="ensures compliance" color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
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+	N13 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	M2 -> N6 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_195.txt b/test/graphviz/graph_hard/graphviz_195.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c15a3bd75fc5d7defe2b307a1dcdbef805a97aa4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_195.txt
@@ -0,0 +1,40 @@
+<Blockchain Node Operation, connectedTo, Decentralized Network Design>
+<Consensus Mechanism Development, connectedTo, Non_Fungible Token Creation>
+<Consensus Mechanism Development, partOf, Consensus Mechanism Development>
+<Cross_Chain Bridges, connectedTo, Decentralized Finance Protocols>
+<Cross_Chain Bridges, connectedTo, Security Token Offerings>
+<Decentralized Applications Development, ensures compliance, Sidechains and Layer 2 Solutions>
+<Decentralized Finance Protocols, connectedTo, Healthcare Data Management>
+<Decentralized Finance Protocols, connectedTo, Tokenomics Design>
+<Decentralized Network Design, connectedTo, Cross_Border Payments>
+<Enterprise Blockchain Solutions, connectedTo, Financial Asset Tokenization>
+<Financial Asset Tokenization, connectedTo, Voting Systems on Blockchain>
+<Healthcare Data Management, manages real estate, Public Blockchain Deployment>
+<Intellectual Property Management, connectedTo, Decentralized Finance Protocols>
+<Intellectual Property Management, connectedTo, Zero_Knowledge Proofs>
+<Mining Operations, connectedTo, Security Token Offerings>
+<Mining Operations, partOf, Mining Operations>
+<Non_Fungible Token Creation, connectedTo, Zero_Knowledge Proofs>
+<Non_Fungible Token Creation, partOf, Non_Fungible Token Creation>
+<Oracles Integration, builds NFTs, Blockchain Node Operation>
+<Oracles Integration, connectedTo, Cross_Border Payments>
+<Oracles Integration, connectedTo, Enterprise Blockchain Solutions>
+<Oracles Integration, connectedTo, Healthcare Data Management>
+<Oracles Integration, connectedTo, Public Blockchain Deployment>
+<Oracles Integration, connectedTo, Real Estate Tokenization>
+<Public Blockchain Deployment, connectedTo, Blockchain Node Operation>
+<Public Blockchain Deployment, connectedTo, Consensus Mechanism Development>
+<Public Blockchain Deployment, connectedTo, Cross_Border Payments>
+<Public Blockchain Deployment, connectedTo, Decentralized Network Design>
+<Real Estate Tokenization, connectedTo, Regulatory Compliance for Blockchain>
+<Real Estate Tokenization, partOf, Real Estate Tokenization>
+<Regulatory Compliance for Blockchain, connectedTo, Mining Operations>
+<Regulatory Compliance for Blockchain, partOf, Regulatory Compliance for Blockchain>
+<Security Token Offerings, connectedTo, Decentralized Finance Protocols>
+<Security Token Offerings, uses ZKPs, Intellectual Property Management>
+<Sidechains and Layer 2 Solutions, connectedTo, Decentralized Finance Protocols>
+<Sidechains and Layer 2 Solutions, connectedTo, Healthcare Data Management>
+<Tokenomics Design, connectedTo, Oracles Integration>
+<Voting Systems on Blockchain, connectedTo, Healthcare Data Management>
+<Zero_Knowledge Proofs, connectedTo, Decentralized Applications Development>
+<Zero_Knowledge Proofs, connectedTo, Decentralized Finance Protocols>
diff --git a/test/graphviz/graph_hard/graphviz_196.txt b/test/graphviz/graph_hard/graphviz_196.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6ebc94a0bd888257c172500fee65be2ea0aa7940
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_196.txt
@@ -0,0 +1,45 @@
+<Airdrop Campaigns, connectedTo, Venture Capital Funding>
+<Blockchain Explorers, integrates fiat, Fraud Prevention>
+<Blockchain Integration, connectedTo, Smart Contract Auditing>
+<Blockchain Integration, partOf, Blockchain Integration>
+<Cold Storage Solutions, connectedTo, Blockchain Integration>
+<Cold Storage Solutions, connectedTo, Lending and Borrowing Protocols>
+<Cold Storage Solutions, connectedTo, Venture Capital Funding>
+<Cold Storage Solutions, connectedTo, Web3 Integration>
+<Cold Storage Solutions, performs KYCs, KYC or AML Procedures>
+<Community Building, connectedTo, Yield Farming>
+<Community Building, partOf, Community Building>
+<Cross_chain Swaps, connectedTo, Airdrop Campaigns>
+<Cross_chain Swaps, connectedTo, GameFi Development>
+<Cross_chain Swaps, connectedTo, Hot Wallet Security>
+<Cross_chain Swaps, connectedTo, Tax Reporting for Crypto>
+<Cross_chain Swaps, stakes assets, Venture Capital Funding>
+<Decentralized Autonomous Organizations, connectedTo, Airdrop Campaigns>
+<Decentralized Autonomous Organizations, connectedTo, Cold Storage Solutions>
+<Decentralized Autonomous Organizations, connectedTo, Mining Algorithm Design>
+<Exchange Listing, connectedTo, KYC or AML Procedures>
+<Exchange Listing, partOf, Exchange Listing>
+<Fraud Prevention, calculates taxes, Interoperability Solutions>
+<GameFi Development, connectedTo, Airdrop Campaigns>
+<GameFi Development, connectedTo, Cold Storage Solutions>
+<Initial Exchange Offering, conducts IEOs, KYC or AML Procedures>
+<Interoperability Solutions, connectedTo, Initial Exchange Offering>
+<KYC or AML Procedures, connectedTo, Key Management>
+<Key Management, enables swaps, Airdrop Campaigns>
+<Lending and Borrowing Protocols, connectedTo, Airdrop Campaigns>
+<Lending and Borrowing Protocols, connectedTo, Blockchain Explorers>
+<Mining Algorithm Design, connectedTo, Cold Storage Solutions>
+<Mining Algorithm Design, connectedTo, Cross_chain Swaps>
+<Portfolio Management, manages portfolios, Exchange Listing>
+<Portfolio Management, partOf, Portfolio Management>
+<Smart Contract Auditing, connectedTo, Community Building>
+<Smart Contract Auditing, partOf, Smart Contract Auditing>
+<Tax Reporting for Crypto, connectedTo, GameFi Development>
+<Tax Reporting for Crypto, facilitates trades, Cold Storage Solutions>
+<Transaction Processing, connectedTo, Portfolio Management>
+<Transaction Processing, partOf, Transaction Processing>
+<Venture Capital Funding, connectedTo, Hot Wallet Security>
+<Web3 Integration, connectedTo, Transaction Processing>
+<Web3 Integration, partOf, Web3 Integration>
+<Yield Farming, connectedTo, Venture Capital Funding>
+<Yield Farming, partOf, Yield Farming>
diff --git a/test/graphviz/graph_hard/graphviz_197.dot b/test/graphviz/graph_hard/graphviz_197.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a32b5568640af14051d319463db18a0a04d52f69
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_197.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=LR
+	N0 [label="Cryptocurrency Trading Bots" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Cold Storage Solutions" color="#E91E63" fillcolor="#FCE4EC" shape=plaintext style=filled]
+	N2 [label="Decentralized Autonomous Organizations" color="#FFB74D" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N3 [label="Custodial Services" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N4 [label="GameFi Development" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Wallet Development" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N6 [label="Initial Exchange Offering" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N7 [label="Blockchain Explorers" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N8 [label="Tax Reporting for Crypto" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N9 [label="Regulatory Compliance" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N10 [label="Transaction Processing" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N11 [label="Stablecoin Design" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N12 [label="Fiat On or Off Ramps" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N13 [label="Legal Advisory for Crypto" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N14 [label="Hot Wallet Security" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N15 [label="Portfolio Management" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Market Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Key Management" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_1 [label="Interoperability Solutions" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Coin Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Token Generation Event" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_1 [label="KYC or AML Procedures" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest1_2 [label="Fraud Prevention" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="lends funds" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label="analyzes markets" color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest1_0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S1 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [label="explores new chains" color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M2 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_197.txt b/test/graphviz/graph_hard/graphviz_197.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a74b42d37388ae7a20e8268c46b5ccbc2531beeb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_197.txt
@@ -0,0 +1,44 @@
+<Blockchain Explorers, connectedTo, Tax Reporting for Crypto>
+<Blockchain Explorers, connectedTo, Transaction Processing>
+<Cold Storage Solutions, connectedTo, Decentralized Autonomous Organizations>
+<Cold Storage Solutions, connectedTo, Fiat On or Off Ramps>
+<Cold Storage Solutions, connectedTo, GameFi Development>
+<Cold Storage Solutions, connectedTo, Key Management>
+<Cold Storage Solutions, connectedTo, Tax Reporting for Crypto>
+<Cold Storage Solutions, connectedTo, Transaction Processing>
+<Cryptocurrency Trading Bots, connectedTo, Cold Storage Solutions>
+<Custodial Services, connectedTo, Fiat On or Off Ramps>
+<Custodial Services, connectedTo, GameFi Development>
+<Decentralized Autonomous Organizations, connectedTo, Custodial Services>
+<Decentralized Autonomous Organizations, connectedTo, Transaction Processing>
+<Fiat On or Off Ramps, connectedTo, Legal Advisory for Crypto>
+<Fraud Prevention, connectedTo, Regulatory Compliance>
+<Fraud Prevention, partOf, Fraud Prevention>
+<GameFi Development, connectedTo, Fiat On or Off Ramps>
+<GameFi Development, connectedTo, Transaction Processing>
+<GameFi Development, lends funds, Wallet Development>
+<Hot Wallet Security, connectedTo, Portfolio Management>
+<Hot Wallet Security, connectedTo, Token Generation Event>
+<Initial Exchange Offering, connectedTo, Blockchain Explorers>
+<Interoperability Solutions, connectedTo, Custodial Services>
+<Interoperability Solutions, partOf, Interoperability Solutions>
+<KYC or AML Procedures, connectedTo, Fraud Prevention>
+<KYC or AML Procedures, partOf, KYC or AML Procedures>
+<Key Management, connectedTo, Interoperability Solutions>
+<Key Management, partOf, Key Management>
+<Legal Advisory for Crypto, connectedTo, Hot Wallet Security>
+<Regulatory Compliance, connectedTo, Hot Wallet Security>
+<Regulatory Compliance, connectedTo, Legal Advisory for Crypto>
+<Regulatory Compliance, connectedTo, Portfolio Management>
+<Regulatory Compliance, connectedTo, Stablecoin Design>
+<Regulatory Compliance, connectedTo, Transaction Processing>
+<Stablecoin Design, connectedTo, Fiat On or Off Ramps>
+<Stablecoin Design, connectedTo, Hot Wallet Security>
+<Stablecoin Design, connectedTo, Portfolio Management>
+<Tax Reporting for Crypto, connectedTo, Fiat On or Off Ramps>
+<Tax Reporting for Crypto, connectedTo, Regulatory Compliance>
+<Token Generation Event, connectedTo, KYC or AML Procedures>
+<Token Generation Event, partOf, Token Generation Event>
+<Transaction Processing, analyzes markets, Stablecoin Design>
+<Wallet Development, connectedTo, Initial Exchange Offering>
+<Wallet Development, explores new chains, Transaction Processing>
diff --git a/test/graphviz/graph_hard/graphviz_20.dot b/test/graphviz/graph_hard/graphviz_20.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fb8d64b63acbce86870676cab60842e839b29700
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_20.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Distributed Generation Management" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Grid Balancing" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N2 [label="Power Plant" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N3 [label="Sensor Reading" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N4 [label="Energy Storage" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N5 [label="Energy Efficiency Audit" color="#E91E63" fillcolor="#FCE4EC" shape=Mdiamond style=filled]
+	N6 [label="Carbon Capture" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N7 [label="Substation Automation" color="#E91E63" fillcolor="#FCE4EC" shape=oval style=filled]
+	N8 [label="Consumption Logging" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N9 [label="Wind Turbine Monitoring" color="#E0E0E0" fillcolor="#EBEBEB" shape=oval style=filled]
+	N10 [label="Battery Monitoring" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Renewable Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Power Backup" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+		nest0_1 [label="Load Shedding" color="#E0E0E0" fillcolor="#EBEBEB" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Regulatory Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Fuel Delivery" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+		nest1_1 [label="Hydropower Generation" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_2 [label="Transmission Line Maintenance" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_3 [label="Grid Modernization" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [label=conserves color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [label=permits color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label=detects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_20.txt b/test/graphviz/graph_hard/graphviz_20.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1627636e11d6ffa1867d53cfcf424505db952c6e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_20.txt
@@ -0,0 +1,34 @@
+<Carbon Capture, connectedTo, Substation Automation>
+<Consumption Logging, connectedTo, Wind Turbine Monitoring>
+<Distributed Generation Management, connectedTo, Grid Balancing>
+<Distributed Generation Management, detects, Wind Turbine Monitoring>
+<Energy Efficiency Audit, connectedTo, Carbon Capture>
+<Energy Efficiency Audit, connectedTo, Wind Turbine Monitoring>
+<Energy Efficiency Audit, conserves, Power Backup>
+<Energy Storage, connectedTo, Energy Efficiency Audit>
+<Energy Storage, connectedTo, Fuel Delivery>
+<Fuel Delivery, connectedTo, Hydropower Generation>
+<Fuel Delivery, partOf, Fuel Delivery>
+<Grid Balancing, connectedTo, Power Plant>
+<Grid Modernization, connectedTo, Grid Balancing>
+<Grid Modernization, partOf, Grid Modernization>
+<Hydropower Generation, connectedTo, Transmission Line Maintenance>
+<Hydropower Generation, partOf, Hydropower Generation>
+<Load Shedding, connectedTo, Energy Efficiency Audit>
+<Load Shedding, partOf, Load Shedding>
+<Power Backup, connectedTo, Load Shedding>
+<Power Backup, partOf, Power Backup>
+<Power Plant, connectedTo, Consumption Logging>
+<Power Plant, connectedTo, Sensor Reading>
+<Power Plant, connectedTo, Substation Automation>
+<Power Plant, connectedTo, Wind Turbine Monitoring>
+<Power Plant, permits, Carbon Capture>
+<Sensor Reading, connectedTo, Consumption Logging>
+<Sensor Reading, connectedTo, Energy Efficiency Audit>
+<Sensor Reading, connectedTo, Energy Storage>
+<Sensor Reading, connectedTo, Wind Turbine Monitoring>
+<Substation Automation, connectedTo, Consumption Logging>
+<Substation Automation, connectedTo, Wind Turbine Monitoring>
+<Transmission Line Maintenance, connectedTo, Grid Modernization>
+<Transmission Line Maintenance, partOf, Transmission Line Maintenance>
+<Wind Turbine Monitoring, connectedTo, Battery Monitoring>
diff --git a/test/graphviz/graph_hard/graphviz_200.txt b/test/graphviz/graph_hard/graphviz_200.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce629917d52db2ea26eb7483a3d848193b3e72f4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_200.txt
@@ -0,0 +1,46 @@
+<Debt Crowdfunding, analyzes data, Investor Relations>
+<Debt Crowdfunding, connectedTo, Goal Setting>
+<Donation_Based Crowdfunding, connectedTo, Equity Crowdfunding>
+<Donation_Based Crowdfunding, connectedTo, Marketing Strategy>
+<Equity Crowdfunding, connectedTo, Investor Relations>
+<Equity Crowdfunding, manages debt, Post_Campaign Updates>
+<Escrow Management, connectedTo, Real Estate Crowdfunding>
+<Fulfillment Planning, connectedTo, Platform Selection>
+<Funding Period Management, analyzes data, Financial Projection Analysis>
+<Funding Period Management, partOf, Funding Period Management>
+<Goal Setting, connectedTo, Donation_Based Crowdfunding>
+<Goal Setting, connectedTo, Investor Relations>
+<Goal Setting, connectedTo, Legal Compliance>
+<Goal Setting, connectedTo, Platform Selection>
+<Goal Setting, connectedTo, Post_Campaign Updates>
+<Intellectual Property Protection, connectedTo, International Crowdfunding>
+<Intellectual Property Protection, partOf, Intellectual Property Protection>
+<International Crowdfunding, connectedTo, Manufacturing Planning>
+<International Crowdfunding, partOf, International Crowdfunding>
+<Investor Relations, connectedTo, Fulfillment Planning>
+<Legal Compliance, connectedTo, Financial Projection Analysis>
+<Logistics for Rewards, connectedTo, Equity Crowdfunding>
+<Logistics for Rewards, connectedTo, Investor Relations>
+<Logistics for Rewards, connectedTo, Payment Processing>
+<Manufacturing Planning, connectedTo, Video Production for Campaigns>
+<Marketing Strategy, connectedTo, Equity Crowdfunding>
+<Marketing Strategy, connectedTo, Logistics for Rewards>
+<Payment Processing, connectedTo, Post_Campaign Reporting>
+<Payment Processing, connectedTo, Project Vetting>
+<Pitch Deck Preparation, connectedTo, Reward_Based Crowdfunding>
+<Platform Selection, connectedTo, Intellectual Property Protection>
+<Platform Selection, connectedTo, Manufacturing Planning>
+<Post_Campaign Reporting, connectedTo, Equity Crowdfunding>
+<Post_Campaign Reporting, connectedTo, Legal Compliance>
+<Post_Campaign Reporting, connectedTo, Post_Campaign Updates>
+<Post_Campaign Reporting, connectedTo, Real Estate Crowdfunding>
+<Post_Campaign Reporting, provides support, Video Production for Campaigns>
+<Post_Campaign Updates, connectedTo, Investor Relations>
+<Project Vetting, connectedTo, Securities Regulations Adherence>
+<Project Vetting, partOf, Project Vetting>
+<Real Estate Crowdfunding, connectedTo, Pitch Deck Preparation>
+<Reward Tier Design, connectedTo, Legal Compliance>
+<Reward_Based Crowdfunding, manages manufacturing, Reward Tier Design>
+<Securities Regulations Adherence, connectedTo, Funding Period Management>
+<Securities Regulations Adherence, partOf, Securities Regulations Adherence>
+<Video Production for Campaigns, connectedTo, Escrow Management>
diff --git a/test/graphviz/graph_hard/graphviz_202.dot b/test/graphviz/graph_hard/graphviz_202.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e2d811266e00d12bbf125cb11d1e44bfd917c40a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_202.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=LR
+	N0 [label="Connected Vehicles" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Predictive Maintenance" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N2 [label="Transportation IoT" color="#64B5F6" fillcolor="#E3F2FD" shape=parallelogram style=filled]
+	N3 [label="Interoperability Standards" color="#64B5F6" fillcolor="#E3F2FD" shape=Mdiamond style=filled]
+	N4 [label="AI at the Edge" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N5 [label="Blockchain for IoT Security" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N6 [label="Data Privacy in IoT" color="#00BCD4" fillcolor="#E0F7FA" shape=octagon style=filled]
+	N7 [label="Energy Management Systems" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N8 [label="Edge Computing for IoT" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N9 [label="Environmental Monitoring" color="#64B5F6" fillcolor="#E3F2FD" shape=plaintext style=filled]
+	N10 [label="Smart Manufacturing" color="#4DB6AC" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N11 [label="Retail IoT" color="#4DB6AC" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N12 [label="Healthcare IoT Devices" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N13 [label="Data Analysis in Cloud" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N14 [label="Cloud Platform Integration" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N15 [label="Smart City Sensors" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+	N16 [label="IoT Device Certification" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Data Collection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Agricultural IoT" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_1 [label="Device Prototyping" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Industrial IoT" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Smart Home Devices" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_1 [label="Connectivity Management" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_2 [label="Network Protocol Selection" color="#64B5F6" fillcolor="#E3F2FD" shape=oval style=filled]
+		nest1_3 [label="Security Implementation" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N15 -> nest0_0 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N13 [label="optimizes operations" color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_202.txt b/test/graphviz/graph_hard/graphviz_202.txt
new file mode 100644
index 0000000000000000000000000000000000000000..29dfaccec6cf9302d29464af3fe49f388528d4c2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_202.txt
@@ -0,0 +1,39 @@
+<AI at the Edge, connectedTo, Blockchain for IoT Security>
+<AI at the Edge, connectedTo, Data Analysis in Cloud>
+<AI at the Edge, connectedTo, Data Privacy in IoT>
+<AI at the Edge, connectedTo, Smart Manufacturing>
+<Agricultural IoT, connectedTo, Device Prototyping>
+<Agricultural IoT, partOf, Agricultural IoT>
+<Blockchain for IoT Security, connectedTo, Data Privacy in IoT>
+<Cloud Platform Integration, connectedTo, Smart City Sensors>
+<Connected Vehicles, connectedTo, Predictive Maintenance>
+<Connectivity Management, connectedTo, Network Protocol Selection>
+<Connectivity Management, partOf, Connectivity Management>
+<Data Analysis in Cloud, connectedTo, Cloud Platform Integration>
+<Data Privacy in IoT, connectedTo, Energy Management Systems>
+<Device Prototyping, optimizes operations, Data Analysis in Cloud>
+<Device Prototyping, partOf, Device Prototyping>
+<Edge Computing for IoT, connectedTo, Environmental Monitoring>
+<Energy Management Systems, connectedTo, Edge Computing for IoT>
+<Environmental Monitoring, connectedTo, Smart Manufacturing>
+<Healthcare IoT Devices, connectedTo, Data Analysis in Cloud>
+<Interoperability Standards, connectedTo, AI at the Edge>
+<Interoperability Standards, connectedTo, Environmental Monitoring>
+<Interoperability Standards, connectedTo, Smart Home Devices>
+<Network Protocol Selection, connectedTo, Security Implementation>
+<Network Protocol Selection, partOf, Network Protocol Selection>
+<Predictive Maintenance, connectedTo, Environmental Monitoring>
+<Predictive Maintenance, connectedTo, Transportation IoT>
+<Retail IoT, connectedTo, Healthcare IoT Devices>
+<Security Implementation, connectedTo, Blockchain for IoT Security>
+<Security Implementation, partOf, Security Implementation>
+<Smart City Sensors, connectedTo, Agricultural IoT>
+<Smart City Sensors, connectedTo, IoT Device Certification>
+<Smart Home Devices, connectedTo, Connectivity Management>
+<Smart Home Devices, partOf, Smart Home Devices>
+<Smart Manufacturing, connectedTo, Data Analysis in Cloud>
+<Smart Manufacturing, connectedTo, Healthcare IoT Devices>
+<Smart Manufacturing, connectedTo, Retail IoT>
+<Transportation IoT, connectedTo, Data Privacy in IoT>
+<Transportation IoT, connectedTo, Environmental Monitoring>
+<Transportation IoT, connectedTo, Interoperability Standards>
diff --git a/test/graphviz/graph_hard/graphviz_203.dot b/test/graphviz/graph_hard/graphviz_203.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d3f22f3f4226f429259eae4fdbd55708aad72794
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_203.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Privacy in IoT" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Security Implementation" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N2 [label="Cloud Platform Integration" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N3 [label="Agricultural IoT" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N4 [label="Device Prototyping" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+	N5 [label="Gateway Development" color="#94C0C0" fillcolor="#CADEDE" shape=folder style=filled]
+	N6 [label="Smart City Sensors" color="#94C0C0" fillcolor="#CADEDE" shape=plaintext style=filled]
+	N7 [label="Data Processing at Edge" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N8 [label="API Development for IoT" color="#94C0C0" fillcolor="#CADEDE" shape=Mdiamond style=filled]
+	N9 [label="Over_the_Air Updates" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Predictive Maintenance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Connectivity Management" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest0_1 [label="IoT Device Certification" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_0 -> nest0_1 [label="uses blockchain" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Smart Home Devices" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Device Management" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_1 [label="Blockchain for IoT Security" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="ensures privacy" color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_204.txt b/test/graphviz/graph_hard/graphviz_204.txt
new file mode 100644
index 0000000000000000000000000000000000000000..52b0e4d275a4f07ee596574568fb982668f7b180
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_204.txt
@@ -0,0 +1,38 @@
+<AI at the Edge, connectedTo, Asset Tracking>
+<AI at the Edge, connectedTo, Cloud Platform Integration>
+<API Development for IoT, connectedTo, Blockchain for IoT Security>
+<Agricultural IoT, connectedTo, User Interface for IoT Apps>
+<Asset Tracking, connectedTo, Connected Vehicles>
+<Blockchain for IoT Security, collects data, Smart Home Devices>
+<Cloud Platform Integration, connectedTo, Asset Tracking>
+<Cloud Platform Integration, connectedTo, Device Prototyping>
+<Cloud Platform Integration, connectedTo, Predictive Maintenance>
+<Cloud Platform Integration, connectedTo, Real_time Data Streaming>
+<Cloud Platform Integration, connectedTo, Transportation IoT>
+<Compliance with IoT Regulations, connectedTo, Firmware Updates>
+<Compliance with IoT Regulations, partOf, Compliance with IoT Regulations>
+<Connected Vehicles, connectedTo, Real_time Data Streaming>
+<Device Prototyping, connectedTo, Asset Tracking>
+<Device Prototyping, connectedTo, Interoperability Standards>
+<Firmware Updates, connectedTo, Agricultural IoT>
+<Firmware Updates, partOf, Firmware Updates>
+<Gateway Development, connectedTo, Compliance with IoT Regulations>
+<Gateway Development, partOf, Gateway Development>
+<Industrial IoT, connectedTo, Security Implementation>
+<Industrial IoT, partOf, Industrial IoT>
+<Interoperability Standards, connectedTo, Industrial IoT>
+<Interoperability Standards, partOf, Interoperability Standards>
+<IoT Device Certification, connectedTo, Asset Tracking>
+<IoT Device Certification, connectedTo, Smart City Sensors>
+<Predictive Maintenance, connectedTo, Transportation IoT>
+<Predictive Maintenance, connectedTo, Wearable Technology>
+<Real_time Data Streaming, connectedTo, Transportation IoT>
+<Real_time Data Streaming, enables wearables, Predictive Maintenance>
+<Real_time Data Streaming, optimizes industrial processes, Blockchain for IoT Security>
+<Security Implementation, connectedTo, User Interface for IoT Apps>
+<Security Implementation, partOf, Security Implementation>
+<Smart City Sensors, connectedTo, Agricultural IoT>
+<Transportation IoT, connectedTo, API Development for IoT>
+<User Interface for IoT Apps, connectedTo, AI at the Edge>
+<Wearable Technology, connectedTo, Gateway Development>
+<Wearable Technology, partOf, Wearable Technology>
diff --git a/test/graphviz/graph_hard/graphviz_205.txt b/test/graphviz/graph_hard/graphviz_205.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7551aef92570a869018cd80ab74d61a15c5a6d4e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_205.txt
@@ -0,0 +1,34 @@
+<Connectivity to Cloud, connectedTo, Distributed Data Storage>
+<Connectivity to Cloud, connectedTo, Edge Device Provisioning>
+<Connectivity to Cloud, connectedTo, Edge Security Analytics>
+<Data Filtering at Edge, connectedTo, Edge Device Analytics>
+<Data Filtering at Edge, partOf, Data Filtering at Edge>
+<Data Synchronization between Edge and Cloud, connectedTo, Distributed Data Storage>
+<Data Synchronization between Edge and Cloud, processes events, Sensor Data Aggregation>
+<Distributed Data Storage, connectedTo, Edge Network Topology Design>
+<Distributed Data Storage, connectedTo, Orchestration of Edge Workloads>
+<Distributed Data Storage, connectedTo, Sensor Data Aggregation>
+<Edge AI Model Deployment, connectedTo, Orchestration of Edge Workloads>
+<Edge AI Model Deployment, connectedTo, Sensor Data Aggregation>
+<Edge AI Model Deployment, manages fleet, Data Synchronization between Edge and Cloud>
+<Edge AI Model Deployment, optimizes resources, Sensor Data Aggregation>
+<Edge Computing Hardware Selection, deploys nodes, Telecom Edge Computing>
+<Edge Device Analytics, connectedTo, Healthcare Edge Computing>
+<Edge Device Analytics, partOf, Edge Device Analytics>
+<Edge Device Provisioning, connectedTo, Edge Security Analytics>
+<Edge Gateway Management, connectedTo, Telecom Edge Computing>
+<Edge Gateway Management, partOf, Edge Gateway Management>
+<Edge Network Topology Design, connectedTo, Event_Driven Architectures at Edge>
+<Edge Network Topology Design, partOf, Edge Network Topology Design>
+<Edge Security Analytics, connectedTo, Edge AI Model Deployment>
+<Edge Security Analytics, manages power consumption, Sensor Data Aggregation>
+<Event_Driven Architectures at Edge, connectedTo, Fault Tolerance at Edge>
+<Event_Driven Architectures at Edge, partOf, Event_Driven Architectures at Edge>
+<Fault Tolerance at Edge, connectedTo, Data Synchronization between Edge and Cloud>
+<Fault Tolerance at Edge, partOf, Fault Tolerance at Edge>
+<Healthcare Edge Computing, connectedTo, Edge Gateway Management>
+<Healthcare Edge Computing, partOf, Healthcare Edge Computing>
+<Orchestration of Edge Workloads, connectedTo, Sensor Data Aggregation>
+<Telecom Edge Computing, connectedTo, Connectivity to Cloud>
+<Telecom Edge Computing, connectedTo, Data Filtering at Edge>
+<Telecom Edge Computing, connectedTo, Sensor Data Aggregation>
diff --git a/test/graphviz/graph_hard/graphviz_206.txt b/test/graphviz/graph_hard/graphviz_206.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3f665a84a60e29386e26139468f331fae37ac3bf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_206.txt
@@ -0,0 +1,42 @@
+<Bandwidth Optimization, connectedTo, Security for Edge Devices>
+<Bandwidth Optimization, partOf, Bandwidth Optimization>
+<Containerization at Edge, connectedTo, Bandwidth Optimization>
+<Containerization at Edge, partOf, Containerization at Edge>
+<Data Synchronization between Edge and Cloud, connectedTo, Edge AI Model Deployment>
+<Data Synchronization between Edge and Cloud, connectedTo, Edge Computing Hardware Selection>
+<Distributed Data Storage, connectedTo, Containerization at Edge>
+<Distributed Data Storage, partOf, Distributed Data Storage>
+<Edge AI Model Deployment, connectedTo, Resource Management at Edge>
+<Edge AI Model Deployment, connectedTo, Smart City Edge Solutions>
+<Edge Application Development, connectedTo, Event_Driven Architectures at Edge>
+<Edge Application Development, connectedTo, Fleet Management for Edge Devices>
+<Edge Application Development, connectedTo, Orchestration of Edge Workloads>
+<Edge Computing Hardware Selection, connectedTo, Distributed Data Storage>
+<Edge Computing Hardware Selection, partOf, Edge Computing Hardware Selection>
+<Edge Device Provisioning, connectedTo, Telecom Edge Computing>
+<Edge Device Provisioning, filters data, Orchestration of Edge Workloads>
+<Edge Network Topology Design, connectedTo, Real_time Analytics at Edge>
+<Edge Network Topology Design, partOf, Edge Network Topology Design>
+<Edge Security Analytics, connectedTo, Microservices on Edge Devices>
+<Edge Security Analytics, partOf, Edge Security Analytics>
+<Edge_to_Cloud Data Transfer Optimization, connectedTo, Fault Tolerance at Edge>
+<Fault Tolerance at Edge, connectedTo, Event_Driven Architectures at Edge>
+<Fault Tolerance at Edge, connectedTo, Microservices on Edge Devices>
+<Fault Tolerance at Edge, provisions resources, Edge Application Development>
+<Fleet Management for Edge Devices, optimizes resources, Event_Driven Architectures at Edge>
+<Microservices on Edge Devices, connectedTo, Orchestration of Edge Workloads>
+<Microservices on Edge Devices, connectedTo, Retail Edge Computing>
+<Orchestration of Edge Workloads, deploys analytics, Fleet Management for Edge Devices>
+<Real_time Analytics at Edge, connectedTo, Edge Security Analytics>
+<Real_time Analytics at Edge, partOf, Real_time Analytics at Edge>
+<Remote Device Management, connectedTo, Edge AI Model Deployment>
+<Remote Device Management, connectedTo, Edge_to_Cloud Data Transfer Optimization>
+<Resource Management at Edge, connectedTo, Edge Network Topology Design>
+<Resource Management at Edge, partOf, Resource Management at Edge>
+<Retail Edge Computing, connectedTo, Data Synchronization between Edge and Cloud>
+<Retail Edge Computing, connectedTo, Edge AI Model Deployment>
+<Security for Edge Devices, connectedTo, Remote Device Management>
+<Smart City Edge Solutions, connectedTo, Edge Application Development>
+<Telecom Edge Computing, connectedTo, Edge AI Model Deployment>
+<Telecom Edge Computing, connectedTo, Orchestration of Edge Workloads>
+<Telecom Edge Computing, connectedTo, Security for Edge Devices>
diff --git a/test/graphviz/graph_hard/graphviz_207.dot b/test/graphviz/graph_hard/graphviz_207.dot
new file mode 100644
index 0000000000000000000000000000000000000000..751c1b5fc0f58422d5152ae88e732ab672a041bb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_207.dot
@@ -0,0 +1,60 @@
+digraph {
+	rankdir=RL
+	N0 [label="Edge Device Provisioning" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Telecom Edge Computing" color="#CFCFCF" fillcolor="#F6F6F6" shape=oval style=filled]
+	N2 [label="Network Optimization for Edge" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+	N3 [label="Retail Edge Computing" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N4 [label="Event_Driven Architectures at Edge" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N5 [label="Data Filtering at Edge" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N6 [label="Connectivity to Cloud" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N7 [label="Edge_to_Cloud Data Transfer Optimization" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Edge Gateway Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Local AI or ML Inference" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+		nest0_1 [label="Sensor Data Aggregation" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+		nest0_2 [label="Edge API Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_3 [label="Edge Security Analytics" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Remote Device Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Edge Device Deployment" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+		nest1_1 [label="Edge Computing Hardware Selection" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest1_2 [label="Orchestration of Edge Workloads" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label="optimizes resources" color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [label="deploys nodes" color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_207.txt b/test/graphviz/graph_hard/graphviz_207.txt
new file mode 100644
index 0000000000000000000000000000000000000000..312bed21681f3f368149441e9567343091a7bf56
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_207.txt
@@ -0,0 +1,32 @@
+<Connectivity to Cloud, connectedTo, Edge_to_Cloud Data Transfer Optimization>
+<Data Filtering at Edge, connectedTo, Connectivity to Cloud>
+<Edge API Management, connectedTo, Edge Security Analytics>
+<Edge API Management, partOf, Edge API Management>
+<Edge Computing Hardware Selection, connectedTo, Orchestration of Edge Workloads>
+<Edge Computing Hardware Selection, partOf, Edge Computing Hardware Selection>
+<Edge Device Deployment, connectedTo, Edge Computing Hardware Selection>
+<Edge Device Deployment, partOf, Edge Device Deployment>
+<Edge Device Provisioning, connectedTo, Connectivity to Cloud>
+<Edge Device Provisioning, connectedTo, Telecom Edge Computing>
+<Edge Security Analytics, connectedTo, Telecom Edge Computing>
+<Edge Security Analytics, partOf, Edge Security Analytics>
+<Event_Driven Architectures at Edge, connectedTo, Connectivity to Cloud>
+<Event_Driven Architectures at Edge, connectedTo, Data Filtering at Edge>
+<Event_Driven Architectures at Edge, connectedTo, Edge_to_Cloud Data Transfer Optimization>
+<Event_Driven Architectures at Edge, deploys nodes, Connectivity to Cloud>
+<Local AI or ML Inference, connectedTo, Sensor Data Aggregation>
+<Local AI or ML Inference, partOf, Local AI or ML Inference>
+<Network Optimization for Edge, connectedTo, Connectivity to Cloud>
+<Network Optimization for Edge, connectedTo, Data Filtering at Edge>
+<Network Optimization for Edge, connectedTo, Retail Edge Computing>
+<Orchestration of Edge Workloads, connectedTo, Telecom Edge Computing>
+<Orchestration of Edge Workloads, partOf, Orchestration of Edge Workloads>
+<Retail Edge Computing, connectedTo, Connectivity to Cloud>
+<Retail Edge Computing, connectedTo, Event_Driven Architectures at Edge>
+<Sensor Data Aggregation, connectedTo, Edge API Management>
+<Sensor Data Aggregation, partOf, Sensor Data Aggregation>
+<Telecom Edge Computing, connectedTo, Connectivity to Cloud>
+<Telecom Edge Computing, connectedTo, Edge Device Deployment>
+<Telecom Edge Computing, connectedTo, Local AI or ML Inference>
+<Telecom Edge Computing, connectedTo, Network Optimization for Edge>
+<Telecom Edge Computing, optimizes resources, Connectivity to Cloud>
diff --git a/test/graphviz/graph_hard/graphviz_209.dot b/test/graphviz/graph_hard/graphviz_209.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e8be6aa384a1ac9d3099cf60ca330b2f08a8d597
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_209.dot
@@ -0,0 +1,86 @@
+digraph {
+	rankdir=LR
+	N0 [label="Public Cloud Management" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Network Configuration in Cloud" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N2 [label="Hybrid Cloud Deployment" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+	N3 [label="Cloud_based VPN Setup" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N4 [label="Identity and Access Management" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N5 [label="Cloud Security" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N6 [label="Private Cloud Management" color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+	N7 [label="Cloud Native Application Development" color="#E91E63" fillcolor="#FCE4EC" shape=folder style=filled]
+	N8 [label="Compliance in Cloud" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+	N9 [label="Cloud FinOps" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N10 [label="Cloud Marketplace Integration" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N11 [label="Infrastructure as a Service" color="#E91E63" fillcolor="#FCE4EC" shape=folder style=filled]
+	N12 [label="Serverless Computing" color="#4CAF50" fillcolor="#C8E6C9" shape=plaintext style=filled]
+	N13 [label="DevOps on Cloud" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N14 [label="Cloud Automation" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N15 [label="Machine Learning as a Service" color="#E91E63" fillcolor="#FCE4EC" shape=oval style=filled]
+	N16 [label="Cloud Vendor Lock_in Mitigation" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N17 [label="Cloud Audit Trails" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N18 [label="Multi_Cloud Management" color="#4CAF50" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N19 [label="Cloud Firewall Configuration" color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+	N20 [label="Load Balancing in Cloud" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Data Storage in Cloud" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud Monitoring and Logging" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_1 [label="Platform as a Service" color="#E91E63" fillcolor="#FCE4EC" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Resource Tagging for Cost Allocation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="CI or CD Pipelines in Cloud" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest1_1 [label="Cloud Migration Strategy" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+		nest1_2 [label="Edge_to_Cloud Integration" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [label="integrates edge" color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N19 -> N20 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N17 -> nest0_0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N19 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N20 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N15 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N19 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [label="monitors performance" color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N20 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M0 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_21.txt b/test/graphviz/graph_hard/graphviz_21.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8e9dbf0df27419efd1b5186053a644dc9b444cc8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_21.txt
@@ -0,0 +1,30 @@
+<Alert Dispatch, connectedTo, Nuclear Reactor Control>
+<Carbon Capture, connectedTo, Power Backup>
+<Carbon Capture, partOf, Carbon Capture>
+<Consumption Logging, connectedTo, Energy Infrastructure Planning>
+<Consumption Logging, partOf, Consumption Logging>
+<Demand Forecast, connectedTo, Consumption Logging>
+<Demand Forecast, connectedTo, Peak Shaving>
+<Distributed Generation Management, partOf, Distributed Generation Management>
+<Distributed Generation Management, stores, Fuel Delivery>
+<Energy Efficiency Audit, connectedTo, Alert Dispatch>
+<Energy Efficiency Audit, connectedTo, Demand Forecast>
+<Energy Efficiency Audit, licenses, Peak Shaving>
+<Energy Infrastructure Planning, connectedTo, Carbon Capture>
+<Energy Infrastructure Planning, partOf, Energy Infrastructure Planning>
+<Energy Storage, connectedTo, Power Backup>
+<Energy Trading, connectedTo, Energy Storage>
+<Energy Trading, connectedTo, Nuclear Reactor Control>
+<Energy Trading, connectedTo, Peak Shaving>
+<Fuel Delivery, connectedTo, Nuclear Reactor Control>
+<Fuel Delivery, partOf, Fuel Delivery>
+<Generator Check, connectedTo, Grid Balancing>
+<Generator Check, connectedTo, Peak Shaving>
+<Grid Balancing, connectedTo, Distributed Generation Management>
+<Grid Balancing, connectedTo, Energy Trading>
+<Peak Shaving, connectedTo, Alert Dispatch>
+<Power Backup, connectedTo, Alert Dispatch>
+<Power Backup, connectedTo, Demand Forecast>
+<Power Backup, connectedTo, Energy Efficiency Audit>
+<Power Backup, connectedTo, Nuclear Reactor Control>
+<Power Backup, plans, Nuclear Reactor Control>
diff --git a/test/graphviz/graph_hard/graphviz_210.dot b/test/graphviz/graph_hard/graphviz_210.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e142e3879b1133bf1ea064b777b8f732291ffa13
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_210.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="API Management in Cloud" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Serverless Computing" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N2 [label="Cloud Monitoring and Logging" color="#FF9800" fillcolor="#FFE0B2" shape=parallelogram style=filled]
+	N3 [label="Private Cloud Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N4 [label="Cost Optimization in Cloud" color="#26A69A" fillcolor="#E0F2F1" shape=oval style=filled]
+	N5 [label="Disaster Recovery in Cloud" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N6 [label="Software as a Service" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N7 [label="Edge_to_Cloud Integration" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N8 [label="Container Orchestration" color="#FF9800" fillcolor="#FFE0B2" shape=oval style=filled]
+	N9 [label="Cloud Firewall Configuration" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N10 [label="Cloud Governance" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N11 [label="Cloud Audit Trails" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N12 [label="Virtual Machine Management" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Resource Tagging for Cost Allocation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud Architecture Design" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+		nest0_1 [label="Cloud Native Application Development" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Cloud Security" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Infrastructure as a Service" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest1_1 [label="Hybrid Cloud Deployment" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_2 [label="Cloud Migration Strategy" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest1_3 [label="Machine Learning as a Service" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label="tags resources" color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="migrates workloads" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="provides IaaS" color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [label="performs backups" color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [label="manages multi_clouds" color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label="orchestrates Kubernetes" color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_211.dot b/test/graphviz/graph_hard/graphviz_211.dot
new file mode 100644
index 0000000000000000000000000000000000000000..96223ccedb1933aaee44de668b04515edb1f1fa4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_211.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Group Policy Management" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N1 [label="Network Security" color="#2196F3" fillcolor="#BBDEFB" shape=plaintext style=filled]
+	N2 [label="Antivirus and Endpoint Protection" color="#26A69A" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N3 [label="Proxy Server Configuration" color="#FFCC80" fillcolor="#FFF0CC" shape=plaintext style=filled]
+	N4 [label="Mail Server Management" color="#26A69A" fillcolor="#E0F2F1" shape=plaintext style=filled]
+	N5 [label="Directory Services" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N6 [label="Hardware Maintenance" color="#FFCC80" fillcolor="#FFF0CC" shape=Mdiamond style=filled]
+	N7 [label="VPN Configuration" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N8 [label="Automation Scripting" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N9 [label="Network Performance Tuning" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N10 [label="Firewall Management" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N11 [label="Hardware Procurement" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+	N12 [label="Power and Cooling Management" color="#2196F3" fillcolor="#BBDEFB" shape=diamond style=filled]
+	N13 [label="Load Balancer Setup" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+	N14 [label="Environmental Monitoring" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Remote Access Solutions" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Data Center Management" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest0_1 [label="Capacity Planning" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest0_2 [label="Database Administration" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Backup and Recovery Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="User Account Management" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+		nest1_1 [label="Virtual Desktop Infrastructure" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+		nest1_2 [label="Network Design" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+		nest1_3 [label="Server Deployment" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [label="virtualizes resources" color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_212.dot b/test/graphviz/graph_hard/graphviz_212.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e823adf6dab9374b658384fea25beb30991f3cd1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_212.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=TD
+	N0 [label="Data Center Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N1 [label="Automation Scripting" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N2 [label="Cloud Integration with On_premise" color="#FFB2A5" fillcolor="#FFDCD6" shape=octagon style=filled]
+	N3 [label="Patch Management" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N4 [label=Virtualization color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N5 [label="Capacity Planning" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N6 [label="Firewall Management" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N7 [label="Mail Server Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N8 [label="Backup and Recovery Systems" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N9 [label="Access Control Systems" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N10 [label="Network Design" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N11 [label="Storage Solutions" color="#795548" fillcolor="#D7CCC8" shape=Mdiamond style=filled]
+	N12 [label="Software Licensing Management" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N13 [label="Virtual Desktop Infrastructure" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Remote Access Solutions" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Operating System Installation" color="#FFD54F" fillcolor="#FFF8E1" shape=oval style=filled]
+		nest0_1 [label="Web Server Configuration" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+		nest0_2 [label="Database Administration" color="#FFB2A5" fillcolor="#FFDCD6" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#795548" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Server Deployment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Troubleshooting and Support" color="#FFB2A5" fillcolor="#FFDCD6" shape=oval style=filled]
+		nest1_1 [label="User Account Management" color="#FFD54F" fillcolor="#FFF8E1" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N11 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N7 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	M2 -> N8 [color="#795548" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_213.txt b/test/graphviz/graph_hard/graphviz_213.txt
new file mode 100644
index 0000000000000000000000000000000000000000..96c5029757184bec39aec775b9bd888f526968f5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_213.txt
@@ -0,0 +1,44 @@
+<Access Control Systems, manages power, Software Licensing Management>
+<Antivirus and Endpoint Protection, manages access controls, Environmental Monitoring>
+<Automation Scripting, connectedTo, Access Control Systems>
+<Automation Scripting, connectedTo, User Account Management>
+<Cabling and Wiring, connectedTo, IT Asset Management>
+<Capacity Planning, connectedTo, Remote Access Solutions>
+<Capacity Planning, partOf, Capacity Planning>
+<Database Administration, connectedTo, Hardware Procurement>
+<Database Administration, partOf, Database Administration>
+<Disaster Recovery Planning, connectedTo, Firewall Management>
+<Disaster Recovery Planning, connectedTo, Monitoring and Alerting>
+<Disaster Recovery Planning, connectedTo, Operating System Installation>
+<Disaster Recovery Planning, connectedTo, Proxy Server Configuration>
+<Disaster Recovery Planning, installs software, VPN Configuration>
+<Environmental Monitoring, connectedTo, Group Policy Management>
+<Firewall Management, connectedTo, Antivirus and Endpoint Protection>
+<Hardware Maintenance, connectedTo, User Account Management>
+<Hardware Maintenance, connectedTo, Web Server Configuration>
+<Hardware Procurement, connectedTo, Patch Management>
+<Hardware Procurement, partOf, Hardware Procurement>
+<IT Asset Management, connectedTo, Proxy Server Configuration>
+<Monitoring and Alerting, implements disaster recovery, Capacity Planning>
+<Monitoring and Alerting, partOf, Monitoring and Alerting>
+<Network Performance Tuning, connectedTo, Cabling and Wiring>
+<Operating System Installation, connectedTo, Automation Scripting>
+<Patch Management, connectedTo, VPN Configuration>
+<Patch Management, partOf, Patch Management>
+<Proxy Server Configuration, connectedTo, Database Administration>
+<Proxy Server Configuration, manages storage, Troubleshooting and Support>
+<Rack and Cabinet Management, connectedTo, Software Licensing Management>
+<Rack and Cabinet Management, partOf, Rack and Cabinet Management>
+<Remote Access Solutions, connectedTo, Rack and Cabinet Management>
+<Remote Access Solutions, partOf, Remote Access Solutions>
+<Software Licensing Management, connectedTo, Network Performance Tuning>
+<Software Licensing Management, connectedTo, User Account Management>
+<Troubleshooting and Support, connectedTo, User Account Management>
+<User Account Management, configures load balancers, Firewall Management>
+<User Account Management, connectedTo, Antivirus and Endpoint Protection>
+<User Account Management, connectedTo, Environmental Monitoring>
+<User Account Management, connectedTo, Virtualization>
+<User Account Management, manages proxies, VPN Configuration>
+<VPN Configuration, connectedTo, Firewall Management>
+<Virtualization, connectedTo, VPN Configuration>
+<Web Server Configuration, connectedTo, Disaster Recovery Planning>
diff --git a/test/graphviz/graph_hard/graphviz_214.dot b/test/graphviz/graph_hard/graphviz_214.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c3bccdd109ed55a4c1ecac3308222c0a3115ed18
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_214.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=TD
+	N0 [label="Cloud Native Development" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N1 [label="Collaboration Tools" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N2 [label="Infrastructure Provisioning" color="#FFCC7A" fillcolor="#FFF6D9" shape=octagon style=filled]
+	N3 [label="Blue_Green Deployments" color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+	N4 [label="Continuous Integration" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N5 [label="Secrets Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+	N6 [label=ChatOps color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N7 [label="Feature Flags" color="#FF5722" fillcolor="#FFCCBC" shape=plaintext style=filled]
+	N8 [label="Infrastructure as Code" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label=Containerization labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Monitoring and Logging" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest0_1 [label="Continuous Delivery" color="#FFCC7A" fillcolor="#FFF6D9" shape=octagon style=filled]
+		nest0_2 [label="Automated Testing" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Chaos Engineering" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Environment Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+		nest1_1 [label="Dynamic Application Security Testing" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+		nest1_2 [label="Immutable Infrastructure" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest1_3 [label="Container Orchestration" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N6 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_214.txt b/test/graphviz/graph_hard/graphviz_214.txt
new file mode 100644
index 0000000000000000000000000000000000000000..10135661ed4b7a56df18cc9729b32ace6935b0b3
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_214.txt
@@ -0,0 +1,32 @@
+<Automated Testing, connectedTo, Continuous Integration>
+<Automated Testing, partOf, Automated Testing>
+<Blue_Green Deployments, connectedTo, Continuous Integration>
+<ChatOps, connectedTo, Environment Management>
+<ChatOps, connectedTo, Feature Flags>
+<Cloud Native Development, connectedTo, Collaboration Tools>
+<Cloud Native Development, connectedTo, Continuous Integration>
+<Cloud Native Development, connectedTo, Feature Flags>
+<Cloud Native Development, connectedTo, Infrastructure Provisioning>
+<Cloud Native Development, connectedTo, Secrets Management>
+<Collaboration Tools, connectedTo, Continuous Integration>
+<Collaboration Tools, connectedTo, Infrastructure Provisioning>
+<Collaboration Tools, connectedTo, Infrastructure as Code>
+<Collaboration Tools, connectedTo, Secrets Management>
+<Container Orchestration, connectedTo, ChatOps>
+<Container Orchestration, partOf, Container Orchestration>
+<Continuous Delivery, connectedTo, Automated Testing>
+<Continuous Delivery, partOf, Continuous Delivery>
+<Continuous Integration, connectedTo, Monitoring and Logging>
+<Continuous Integration, connectedTo, Secrets Management>
+<Dynamic Application Security Testing, connectedTo, Immutable Infrastructure>
+<Dynamic Application Security Testing, partOf, Dynamic Application Security Testing>
+<Environment Management, connectedTo, Dynamic Application Security Testing>
+<Environment Management, partOf, Environment Management>
+<Feature Flags, connectedTo, Infrastructure as Code>
+<Immutable Infrastructure, connectedTo, Container Orchestration>
+<Immutable Infrastructure, partOf, Immutable Infrastructure>
+<Infrastructure Provisioning, connectedTo, Blue_Green Deployments>
+<Infrastructure Provisioning, connectedTo, Continuous Integration>
+<Monitoring and Logging, connectedTo, Continuous Delivery>
+<Monitoring and Logging, partOf, Monitoring and Logging>
+<Secrets Management, connectedTo, ChatOps>
diff --git a/test/graphviz/graph_hard/graphviz_217.dot b/test/graphviz/graph_hard/graphviz_217.dot
new file mode 100644
index 0000000000000000000000000000000000000000..58bb7890785782705b65e4f4e4412451337e46d5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_217.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label=Coding color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Architecture Planning" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N2 [label="Backend Development" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="Performance Optimization" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N4 [label=Maintenance color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N5 [label="Cloud_Native Development" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+	N6 [label="Continuous Delivery" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N7 [label="Database Design" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N8 [label="Integration Testing" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N9 [label="System Design" color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+	N10 [label="Scalability Design" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Compiler Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Game Development" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_1 [label="Version Control" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_2 [label=Documentation color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="User Interface Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Requirements Gathering" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_1 [label=Refactoring color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N3 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [label="uses agile methodologies" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_218.txt b/test/graphviz/graph_hard/graphviz_218.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c5dd5d842d26a7ac281377c83309a95f6933c585
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_218.txt
@@ -0,0 +1,36 @@
+<API Development, connectedTo, Version Control>
+<API Development, partOf, API Development>
+<Bug Fixing, connectedTo, Continuous Delivery>
+<Compiler Design, connectedTo, Testing Frameworks>
+<Compiler Design, partOf, Compiler Design>
+<Containerization, connectedTo, Database Design>
+<Continuous Delivery, connectedTo, Version Control>
+<Data Structures Implementation, connectedTo, Bug Fixing>
+<Data Structures Implementation, connectedTo, Database Design>
+<Data Structures Implementation, connectedTo, Desktop Application Development>
+<Data Structures Implementation, connectedTo, System Design>
+<Data Structures Implementation, connectedTo, Version Control>
+<Database Design, connectedTo, Desktop Application Development>
+<Database Design, connectedTo, Refactoring>
+<Desktop Application Development, connectedTo, Bug Fixing>
+<Frontend Development, connectedTo, Data Structures Implementation>
+<Frontend Development, partOf, Frontend Development>
+<Mobile Application Development, connectedTo, Operating System Development>
+<Mobile Application Development, connectedTo, System Design>
+<Mobile Application Development, connectedTo, Version Control>
+<Operating System Development, connectedTo, Data Structures Implementation>
+<Operating System Development, connectedTo, System Design>
+<System Design, connectedTo, Desktop Application Development>
+<System Design, connectedTo, Technical Debt Management>
+<System Testing, designs APIs, API Development>
+<System Testing, partOf, System Testing>
+<Technical Debt Management, connectedTo, Unit Testing>
+<Technical Debt Management, partOf, Technical Debt Management>
+<Testing Frameworks, connectedTo, User Interface Design>
+<Testing Frameworks, partOf, Testing Frameworks>
+<Unit Testing, connectedTo, System Testing>
+<Unit Testing, partOf, Unit Testing>
+<User Interface Design, connectedTo, Frontend Development>
+<User Interface Design, partOf, User Interface Design>
+<Version Control, connectedTo, Compiler Design>
+<Version Control, connectedTo, Containerization>
diff --git a/test/graphviz/graph_hard/graphviz_219.txt b/test/graphviz/graph_hard/graphviz_219.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d2b5e8560fe7c7005cbab1682734fc994d8e4a55
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_219.txt
@@ -0,0 +1,29 @@
+<Agile Methodologies, connectedTo, Game Development>
+<Agile Methodologies, connectedTo, Mobile Application Development>
+<Architecture Planning, connectedTo, Performance Optimization>
+<Architecture Planning, partOf, Architecture Planning>
+<Containerization, compiles code, Requirements Gathering>
+<Containerization, connectedTo, Frontend Development>
+<Containerization, connectedTo, Mobile Application Development>
+<Containerization, ensures scalability, Microservices Architecture>
+<Data Structures Implementation, connectedTo, Agile Methodologies>
+<Frontend Development, connectedTo, Mobile Application Development>
+<Frontend Development, connectedTo, System Testing>
+<Game Development, connectedTo, Containerization>
+<Game Development, connectedTo, Integration Testing>
+<Game Development, connectedTo, Requirements Gathering>
+<Game Development, connectedTo, Technical Debt Management>
+<Game Development, manages data structures, Microservices Architecture>
+<Integration Testing, connectedTo, Requirements Gathering>
+<Microservices Architecture, connectedTo, Integration Testing>
+<Performance Optimization, connectedTo, System Testing>
+<Performance Optimization, partOf, Performance Optimization>
+<Requirements Gathering, connectedTo, Mobile Application Development>
+<System Testing, connectedTo, Microservices Architecture>
+<System Testing, connectedTo, Web Application Development>
+<Technical Debt Management, connectedTo, Architecture Planning>
+<Technical Debt Management, partOf, Technical Debt Management>
+<User Experience Design, connectedTo, Integration Testing>
+<User Experience Design, partOf, User Experience Design>
+<Web Application Development, connectedTo, User Experience Design>
+<Web Application Development, partOf, Web Application Development>
diff --git a/test/graphviz/graph_hard/graphviz_22.txt b/test/graphviz/graph_hard/graphviz_22.txt
new file mode 100644
index 0000000000000000000000000000000000000000..33a53f085ffbd1f397eb43c11d9aa50d0dfde381
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_22.txt
@@ -0,0 +1,41 @@
+<Arbitration Session, connectedTo, Intel Property Licensing>
+<Bail Hearing, connectedTo, Trademark Registration>
+<Bail Hearing, partOf, Bail Hearing>
+<Case Filing, certifies, Trial Session>
+<Case Filing, connectedTo, Due Diligence>
+<Child Custody, connectedTo, Case Filing>
+<Child Custody, connectedTo, Due Diligence>
+<Client Interview, connectedTo, Corporate Formation>
+<Closing Argument, connectedTo, Judgment Writing>
+<Copyright Infringement, connectedTo, Estate Planning>
+<Corporate Formation, connectedTo, Child Custody>
+<Cross_Examination, connectedTo, Bail Hearing>
+<Cross_Examination, partOf, Cross_Examination>
+<Divorce Proceedings, connectedTo, Legal Research>
+<Divorce Proceedings, partOf, Divorce Proceedings>
+<Enforcement, connectedTo, Sentencing>
+<Enforcement, educates, Due Diligence>
+<Estate Planning, connectedTo, Arbitration Session>
+<Immigration Petition, connectedTo, Divorce Proceedings>
+<Immigration Petition, partOf, Immigration Petition>
+<Intel Property Licensing, connectedTo, Cross_Examination>
+<Intel Property Licensing, connectedTo, Due Diligence>
+<Judgment Writing, connectedTo, Copyright Infringement>
+<Judgment Writing, connectedTo, Legal Consultation>
+<Legal Consultation, connectedTo, Arbitration Session>
+<Legal Consultation, connectedTo, Copyright Infringement>
+<Legal Consultation, connectedTo, Estate Planning>
+<Legal Consultation, connectedTo, Intel Property Licensing>
+<Legal Research, connectedTo, Corporate Formation>
+<Legal Research, partOf, Legal Research>
+<Patent Application, connectedTo, Arbitration Session>
+<Patent Application, connectedTo, Closing Argument>
+<Patent Application, connectedTo, Copyright Infringement>
+<Patent Application, connectedTo, Due Diligence>
+<Patent Application, connectedTo, Enforcement>
+<Sentencing, connectedTo, Closing Argument>
+<Sentencing, connectedTo, Copyright Infringement>
+<Sentencing, connectedTo, Immigration Petition>
+<Trademark Registration, connectedTo, Closing Argument>
+<Trademark Registration, partOf, Trademark Registration>
+<Trial Session, connectedTo, Patent Application>
diff --git a/test/graphviz/graph_hard/graphviz_220.txt b/test/graphviz/graph_hard/graphviz_220.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a5952406c66e7d789f7be86f00158b9b4b3ee772
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_220.txt
@@ -0,0 +1,41 @@
+<ASIC Design, connectedTo, High_Speed Digital Design>
+<ASIC Design, connectedTo, Intellectual Property Protection>
+<ASIC Design, connectedTo, Testing and Validation>
+<Assembly Line Optimization, connectedTo, Supply Chain Management for Components>
+<Assembly Line Optimization, partOf, Assembly Line Optimization>
+<Component Selection, connectedTo, Prototyping>
+<Component Selection, connectedTo, Thermal Management>
+<Component Selection, creates schematics, High_Speed Digital Design>
+<Electromagnetic Compatibility Testing, connectedTo, Component Selection>
+<Electromagnetic Compatibility Testing, connectedTo, High_Speed Digital Design>
+<Electromagnetic Compatibility Testing, connectedTo, Mixed_Signal Design>
+<Enclosure Design, connectedTo, Quality Control>
+<Firmware Development, connectedTo, Assembly Line Optimization>
+<Firmware Development, partOf, Firmware Development>
+<High_Speed Digital Design, connectedTo, Documentation>
+<High_Speed Digital Design, connectedTo, Enclosure Design>
+<High_Speed Digital Design, connectedTo, Optical Module Design>
+<High_Speed Digital Design, manages EMC, Quality Control>
+<Intellectual Property Protection, connectedTo, High_Speed Digital Design>
+<Intellectual Property Protection, connectedTo, Mixed_Signal Design>
+<Manufacturing Process Planning, connectedTo, Documentation>
+<Mixed_Signal Design, connectedTo, High_Speed Digital Design>
+<Mixed_Signal Design, designs mixed_signal, RF Circuit Design>
+<Optical Module Design, connectedTo, Enclosure Design>
+<Prototyping, connectedTo, Mixed_Signal Design>
+<Prototyping, connectedTo, Sensor Integration>
+<Quality Control, designs mechanicals, Manufacturing Process Planning>
+<RF Circuit Design, connectedTo, High_Speed Digital Design>
+<Regulatory Compliance, connectedTo, Schematic Capture>
+<Regulatory Compliance, partOf, Regulatory Compliance>
+<Schematic Capture, partOf, Schematic Capture>
+<Schematic Capture, selects components, High_Speed Digital Design>
+<Sensor Integration, connectedTo, Mixed_Signal Design>
+<Sensor Integration, lays out PCBs, Troubleshooting and Debugging>
+<Supply Chain Management for Components, connectedTo, Quality Control>
+<Supply Chain Management for Components, partOf, Supply Chain Management for Components>
+<Testing and Validation, connectedTo, Regulatory Compliance>
+<Testing and Validation, partOf, Testing and Validation>
+<Thermal Management, connectedTo, Firmware Development>
+<Thermal Management, partOf, Thermal Management>
+<Troubleshooting and Debugging, connectedTo, ASIC Design>
diff --git a/test/graphviz/graph_hard/graphviz_221.dot b/test/graphviz/graph_hard/graphviz_221.dot
new file mode 100644
index 0000000000000000000000000000000000000000..889613c802a291bac7772d67759b5a1a338a0fbd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_221.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Optical Module Design" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label=Prototyping color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N2 [label="Quality Control" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N3 [label=Documentation color="#DCE775" fillcolor="#FCFCE7" shape=folder style=filled]
+	N4 [label="Circuit Design" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N5 [label="Regulatory Compliance" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N6 [label="Troubleshooting and Debugging" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N7 [label="Testing and Validation" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N8 [label="Enclosure Design" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N9 [label="Thermal Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N10 [label="Manufacturing Process Planning" color="#DCE775" fillcolor="#FCFCE7" shape=Mdiamond style=filled]
+	N11 [label="Material Selection" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+	N12 [label="Electromagnetic Compatibility Testing" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_1 [label="ASIC Design" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+		nest0_2 [label="Signal Integrity Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=folder style=filled]
+		nest0_3 [label="High_Speed Digital Design" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
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+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
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+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Microcontroller Programming" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Low_Power Design" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+		nest1_1 [label="Power Management Design" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest1_2 [label="Actuator Control" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="analyzes signals" color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [label="designs mixed_signal" color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_223.dot b/test/graphviz/graph_hard/graphviz_223.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ccba99ccb7321e297819e43e057c8dafe4dcd4ae
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_223.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=TD
+	N0 [label="Camera Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Wearable Device Integration" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N2 [label=Wireframing color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+	N3 [label="Performance Optimization" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N4 [label="App Store Optimization" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N5 [label="Native App Development" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N6 [label="Database Design for Mobile" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+	N7 [label="Real_time Communication Features" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N8 [label="Biometric Authentication" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	N9 [label="Backend Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Payment Gateway Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Deployment to App Stores" color="#BDAFA8" fillcolor="#E4E0DF" shape=Mdiamond style=filled]
+		nest0_1 [label="Security Implementation" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+		nest0_2 [label="Testing and Debugging" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_3 [label="User Feedback Collection" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Widget Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Geolocation Services" color="#BDAFA8" fillcolor="#E4E0DF" shape=plaintext style=filled]
+		nest1_1 [label="Gamification Elements" color="#FFB2A5" fillcolor="#FFDCD6" shape=plaintext style=filled]
+		nest1_2 [label="User Onboarding Flows" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="optimizes ASO" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="manages permissions" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label="optimizes performance" color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_225.txt b/test/graphviz/graph_hard/graphviz_225.txt
new file mode 100644
index 0000000000000000000000000000000000000000..22ae513a118e9078f6e5566a95c94dc7aa4f913d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_225.txt
@@ -0,0 +1,46 @@
+<AR or VR Features in Mobile, connectedTo, App Store Optimization>
+<Accessibility Features, connectedTo, Camera Integration>
+<Accessibility Features, partOf, Accessibility Features>
+<Ad Monetization, connectedTo, Accessibility Features>
+<Ad Monetization, partOf, Ad Monetization>
+<Analytics Tracking, connectedTo, User Feedback Collection>
+<Analytics Tracking, partOf, Analytics Tracking>
+<App Store Optimization, connectedTo, Geolocation Services>
+<App Store Optimization, connectedTo, IoT Device Control via App>
+<App Store Optimization, connectedTo, Performance Optimization>
+<Camera Integration, connectedTo, Wireframing>
+<Cloud Backend for Mobile, connectedTo, Analytics Tracking>
+<Cloud Backend for Mobile, partOf, Cloud Backend for Mobile>
+<Concept Development, connectedTo, AR or VR Features in Mobile>
+<Concept Development, connectedTo, App Store Optimization>
+<Crash Reporting, connectedTo, App Store Optimization>
+<Crash Reporting, connectedTo, Concept Development>
+<Crash Reporting, connectedTo, IoT Device Control via App>
+<Crash Reporting, connectedTo, Performance Optimization>
+<Crash Reporting, connectedTo, User Experience Design>
+<Database Design for Mobile, connectedTo, App Store Optimization>
+<Database Design for Mobile, connectedTo, Concept Development>
+<Geolocation Services, connectedTo, Performance Optimization>
+<Native App Development, connectedTo, Camera Integration>
+<Native App Development, connectedTo, User Experience Design>
+<Payment Gateway Integration, connectedTo, Ad Monetization>
+<Payment Gateway Integration, partOf, Payment Gateway Integration>
+<Performance Optimization, connectedTo, IoT Device Control via App>
+<Push Notification Implementation, connectedTo, Camera Integration>
+<Push Notification Implementation, partOf, Push Notification Implementation>
+<Updates and Maintenance, connectedTo, Native App Development>
+<Updates and Maintenance, connectedTo, User Experience Design>
+<User Experience Design, connectedTo, App Store Optimization>
+<User Experience Design, connectedTo, Cloud Backend for Mobile>
+<User Experience Design, connectedTo, Database Design for Mobile>
+<User Experience Design, connectedTo, IoT Device Control via App>
+<User Feedback Collection, connectedTo, Push Notification Implementation>
+<User Feedback Collection, partOf, User Feedback Collection>
+<Wearable Device Integration, connectedTo, Payment Gateway Integration>
+<Wearable Device Integration, partOf, Wearable Device Integration>
+<Wireframing, connectedTo, Crash Reporting>
+<Wireframing, connectedTo, Database Design for Mobile>
+<Wireframing, connectedTo, Geolocation Services>
+<Wireframing, connectedTo, User Experience Design>
+<Wireframing, connectedTo, Wearable Device Integration>
+<Wireframing, develops native apps, Concept Development>
diff --git a/test/graphviz/graph_hard/graphviz_226.dot b/test/graphviz/graph_hard/graphviz_226.dot
new file mode 100644
index 0000000000000000000000000000000000000000..680d40c2bb2460206fe56c12b6f16e8113602074
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_226.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Campaign Management" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Influencer Collaboration" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N2 [label="Platform Algorithm Understanding" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N3 [label="Emerging Platform Exploration" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N4 [label="Personal Branding on Social Media" color="#FFCC80" fillcolor="#FFF0CC" shape=oval style=filled]
+	N5 [label="Direct Messaging Strategy" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N6 [label="Hashtag Research" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N7 [label="Story Format Content Creation" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N8 [label="Live Streaming on Social Media" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N9 [label="Audience Engagement" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N10 [label="Competitor Analysis" color="#AED581" fillcolor="#F0F4C3" shape=Mdiamond style=filled]
+	N11 [label="Engagement Rate Calculation" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N12 [label="Crisis Communication Plan" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N13 [label="Link_in_Bio Optimization" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N14 [label="User_Generated Content Curation" color="#FFCC80" fillcolor="#FFF0CC" shape=plaintext style=filled]
+	N15 [label="Content Moderation" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N16 [label="Follower Growth Monitoring" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N17 [label="Trend Monitoring" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Polls and Quizzes Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Reach and Impressions Tracking" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest0_1 [label="Platform Selection" color="#AED581" fillcolor="#F0F4C3" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Crisis Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Content Strategy" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+		nest1_1 [label="Customer Service on Social Media" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="runs polls" color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N15 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N14 [label="considers ethics" color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N15 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_228.dot b/test/graphviz/graph_hard/graphviz_228.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c58f13759b3593aaec8f6d04af8c5745fe2862c6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_228.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=LR
+	N0 [label="Community Management" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Crisis Communication Plan" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N2 [label="Reputation Management" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+	N3 [label="Competitor Analysis" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N4 [label="Reach and Impressions Tracking" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N5 [label="Content Creation" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N6 [label="Performance Analytics" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N7 [label="Trend Monitoring" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N8 [label="Audience Engagement" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Social Media Audits" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Content Moderation" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_1 [label="Follower Growth Monitoring" color="#FBC02D" fillcolor="#FFFDE7" shape=plaintext style=filled]
+		nest0_2 [label="Brand Voice Development" color="#AF56A6" fillcolor="#DDCEDD" shape=folder style=filled]
+		nest0_3 [label="Paid Social Media Advertising" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Ethical Use of Social Media" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Emerging Platform Exploration" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_1 [label="User_Generated Content Curation" color="#2196F3" fillcolor="#BBDEFB" shape=octagon style=filled]
+		nest1_2 [label=Cross_Promotion color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+		nest1_3 [label="Platform Algorithm Understanding" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [label="monitors trends" color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="explores new features" color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label="manages profiles" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_228.txt b/test/graphviz/graph_hard/graphviz_228.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c7d0a41df43d69861cd9a53122cb42aa96a99935
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_228.txt
@@ -0,0 +1,34 @@
+<Brand Voice Development, connectedTo, Paid Social Media Advertising>
+<Brand Voice Development, partOf, Brand Voice Development>
+<Community Management, connectedTo, Crisis Communication Plan>
+<Competitor Analysis, connectedTo, Audience Engagement>
+<Competitor Analysis, connectedTo, Emerging Platform Exploration>
+<Competitor Analysis, connectedTo, Performance Analytics>
+<Competitor Analysis, connectedTo, Reach and Impressions Tracking>
+<Content Creation, connectedTo, Performance Analytics>
+<Content Moderation, connectedTo, Follower Growth Monitoring>
+<Content Moderation, partOf, Content Moderation>
+<Crisis Communication Plan, connectedTo, Audience Engagement>
+<Crisis Communication Plan, connectedTo, Content Moderation>
+<Crisis Communication Plan, connectedTo, Performance Analytics>
+<Crisis Communication Plan, connectedTo, Reach and Impressions Tracking>
+<Crisis Communication Plan, connectedTo, Reputation Management>
+<Cross_Promotion, connectedTo, Platform Algorithm Understanding>
+<Cross_Promotion, partOf, Cross_Promotion>
+<Emerging Platform Exploration, monitors trends, User_Generated Content Curation>
+<Emerging Platform Exploration, partOf, Emerging Platform Exploration>
+<Follower Growth Monitoring, connectedTo, Brand Voice Development>
+<Follower Growth Monitoring, partOf, Follower Growth Monitoring>
+<Paid Social Media Advertising, connectedTo, Crisis Communication Plan>
+<Paid Social Media Advertising, partOf, Paid Social Media Advertising>
+<Performance Analytics, manages profiles, Trend Monitoring>
+<Platform Algorithm Understanding, connectedTo, Audience Engagement>
+<Platform Algorithm Understanding, partOf, Platform Algorithm Understanding>
+<Reach and Impressions Tracking, connectedTo, Audience Engagement>
+<Reach and Impressions Tracking, connectedTo, Content Creation>
+<Reach and Impressions Tracking, connectedTo, Performance Analytics>
+<Reputation Management, connectedTo, Audience Engagement>
+<Reputation Management, explores new features, Competitor Analysis>
+<Trend Monitoring, connectedTo, Audience Engagement>
+<User_Generated Content Curation, connectedTo, Cross_Promotion>
+<User_Generated Content Curation, partOf, User_Generated Content Curation>
diff --git a/test/graphviz/graph_hard/graphviz_23.txt b/test/graphviz/graph_hard/graphviz_23.txt
new file mode 100644
index 0000000000000000000000000000000000000000..30e1a4278d474224d0ad8216f56300c013deef80
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_23.txt
@@ -0,0 +1,47 @@
+<Amicus Brief Submission, connectedTo, Court Order Execution>
+<Amicus Brief Submission, connectedTo, Sentencing>
+<Appeal Submission, connectedTo, Due Diligence>
+<Appeal Submission, protects, Discovery Process>
+<Arbitration Session, connectedTo, Immigration Petition>
+<Arbitration Session, partOf, Arbitration Session>
+<Bankruptcy Filing, connectedTo, Due Diligence>
+<Bankruptcy Filing, connectedTo, Enforcement>
+<Bankruptcy Filing, connectedTo, Immigration Petition>
+<Bankruptcy Filing, connectedTo, Settlement Negotiation>
+<Client Interview, connectedTo, Jury Selection>
+<Client Interview, partOf, Client Interview>
+<Closing Argument, connectedTo, Evidence Collection>
+<Closing Argument, connectedTo, Jury Selection>
+<Closing Argument, connectedTo, Settlement Negotiation>
+<Court Order Execution, connectedTo, Client Interview>
+<Court Order Execution, partOf, Court Order Execution>
+<Cross_Examination, connectedTo, Arbitration Session>
+<Cross_Examination, partOf, Cross_Examination>
+<Discovery Process, connectedTo, Bankruptcy Filing>
+<Document Drafting, connectedTo, Due Diligence>
+<Document Drafting, connectedTo, Settlement Negotiation>
+<Document Drafting, connectedTo, Verdict Announcement>
+<Due Diligence, connectedTo, Immigration Petition>
+<Enforcement, connectedTo, Settlement Negotiation>
+<Evidence Collection, certifies, Cross_Examination>
+<Evidence Collection, partOf, Evidence Collection>
+<Intel Property Licensing, connectedTo, Plea Bargain>
+<Jury Selection, connectedTo, Witness Testimony>
+<Legal Research, connectedTo, Appeal Submission>
+<Legal Research, connectedTo, Bankruptcy Filing>
+<Legal Research, connectedTo, Discovery Process>
+<Legal Research, connectedTo, Due Diligence>
+<Legal Research, connectedTo, Enforcement>
+<Legal Research, drafts, Due Diligence>
+<Notarization, connectedTo, Intel Property Licensing>
+<Plea Bargain, connectedTo, Closing Argument>
+<Plea Bargain, connectedTo, Settlement Negotiation>
+<Pro Bono Work, connectedTo, Amicus Brief Submission>
+<Sentencing, connectedTo, Legal Research>
+<Settlement Negotiation, connectedTo, Due Diligence>
+<Verdict Announcement, connectedTo, Notarization>
+<Verdict Announcement, connectedTo, Settlement Negotiation>
+<Witness Testimony, connectedTo, Legal Research>
+<Witness Testimony, connectedTo, Pro Bono Work>
+<Witness Testimony, connectedTo, Sentencing>
+<Witness Testimony, connectedTo, Settlement Negotiation>
diff --git a/test/graphviz/graph_hard/graphviz_230.dot b/test/graphviz/graph_hard/graphviz_230.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b7d1b73b6cd0d431eb147edad0ce1afc7952352a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_230.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Google Analytics Integration" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Local SEO" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+	N2 [label="Voice Search Optimization" color="#AB47BC" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N3 [label="Content Quality Assessment" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N4 [label="Search Engine Optimization" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N5 [label="Search Result Display" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+	N6 [label="Technical SEO" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+	N7 [label="Search Engine Marketing Strategy" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N8 [label="Semantic Search" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N9 [label="Paid Search Advertising" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N10 [label="Featured Snippets Optimization" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N11 [label="Site Architecture Optimization" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N12 [label="User Experience for Search" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N13 [label="Competitor Keyword Analysis" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N14 [label="Negative SEO Prevention" color="#673AB7" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N15 [label="News Search" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N16 [label="Core Web Vitals Optimization" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N17 [label="Off_Page SEO" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N18 [label="Algorithm Updates Monitoring" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Google My Business Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Personalized Search Results" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest0_1 [label="Mobile_First Indexing" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest0_2 [label="Penalties Recovery" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="manages PPC" color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Query Processing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Indexing Content" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest1_1 [label="Crawling Websites" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest1_2 [label="Click_Through Rate Optimization" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [label="handles voice search" color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label="improves core vitals" color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="uses schema markup" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N14 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N15 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_230.txt b/test/graphviz/graph_hard/graphviz_230.txt
new file mode 100644
index 0000000000000000000000000000000000000000..533d2d7c660f9d7a233f6121e8fd0027577ac181
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_230.txt
@@ -0,0 +1,42 @@
+<Click_Through Rate Optimization, connectedTo, Content Quality Assessment>
+<Click_Through Rate Optimization, partOf, Click_Through Rate Optimization>
+<Competitor Keyword Analysis, connectedTo, Negative SEO Prevention>
+<Content Quality Assessment, connectedTo, Search Engine Optimization>
+<Core Web Vitals Optimization, connectedTo, Off_Page SEO>
+<Crawling Websites, improves core vitals, Click_Through Rate Optimization>
+<Crawling Websites, partOf, Crawling Websites>
+<Featured Snippets Optimization, connectedTo, Indexing Content>
+<Featured Snippets Optimization, connectedTo, Site Architecture Optimization>
+<Google Analytics Integration, connectedTo, Local SEO>
+<Google Analytics Integration, connectedTo, Paid Search Advertising>
+<Google Analytics Integration, connectedTo, User Experience for Search>
+<Indexing Content, handles voice search, Crawling Websites>
+<Indexing Content, partOf, Indexing Content>
+<Local SEO, connectedTo, Voice Search Optimization>
+<Mobile_First Indexing, manages PPC, Penalties Recovery>
+<Mobile_First Indexing, partOf, Mobile_First Indexing>
+<Negative SEO Prevention, connectedTo, News Search>
+<News Search, connectedTo, Algorithm Updates Monitoring>
+<News Search, connectedTo, Core Web Vitals Optimization>
+<News Search, connectedTo, Off_Page SEO>
+<Off_Page SEO, connectedTo, Algorithm Updates Monitoring>
+<Paid Search Advertising, connectedTo, Featured Snippets Optimization>
+<Penalties Recovery, connectedTo, Negative SEO Prevention>
+<Penalties Recovery, partOf, Penalties Recovery>
+<Personalized Search Results, connectedTo, Mobile_First Indexing>
+<Personalized Search Results, partOf, Personalized Search Results>
+<Search Engine Marketing Strategy, uses schema markup, Semantic Search>
+<Search Engine Optimization, connectedTo, Search Result Display>
+<Search Engine Optimization, connectedTo, User Experience for Search>
+<Search Result Display, connectedTo, Algorithm Updates Monitoring>
+<Search Result Display, connectedTo, Negative SEO Prevention>
+<Search Result Display, connectedTo, Paid Search Advertising>
+<Search Result Display, connectedTo, Search Engine Marketing Strategy>
+<Search Result Display, connectedTo, Technical SEO>
+<Semantic Search, connectedTo, Paid Search Advertising>
+<Semantic Search, connectedTo, User Experience for Search>
+<Site Architecture Optimization, connectedTo, User Experience for Search>
+<Technical SEO, connectedTo, Personalized Search Results>
+<Technical SEO, connectedTo, Search Engine Marketing Strategy>
+<User Experience for Search, connectedTo, Competitor Keyword Analysis>
+<Voice Search Optimization, connectedTo, Content Quality Assessment>
diff --git a/test/graphviz/graph_hard/graphviz_231.dot b/test/graphviz/graph_hard/graphviz_231.dot
new file mode 100644
index 0000000000000000000000000000000000000000..41ca1a66ae4d6803ba37473992bccb9fffea59fc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_231.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Negative SEO Prevention" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N1 [label="Competitor Keyword Analysis" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+	N2 [label="Off_Page SEO" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N3 [label="Penalties Recovery" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N4 [label="Algorithm Updates Monitoring" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N5 [label="Search Engine Optimization" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N6 [label="Core Web Vitals Optimization" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+	N7 [label="International SEO" color="#A1887F" fillcolor="#EFEBE9" shape=parallelogram style=filled]
+	N8 [label="Click_Through Rate Optimization" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N9 [label="Indexing Content" color="#BA68C8" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N10 [label="Personalized Search Results" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N11 [label="Search Engine Marketing Strategy" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N12 [label="Academic Search" color="#BA68C8" fillcolor="#F3E5F5" shape=plaintext style=filled]
+	N13 [label="Site Architecture Optimization" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="User Experience for Search" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Semantic Search" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest0_1 [label="News Search" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Google Analytics Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Technical SEO" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest1_1 [label="Video Search" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+		nest1_2 [label="Mobile_First Indexing" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label="optimizes on_page" color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="handles negative SEO" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest1_0 [label="manages PPC" color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [label="creates content" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [label="generates featured snippets" color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [label="designs site architecture" color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	M1 -> N13 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_232.dot b/test/graphviz/graph_hard/graphviz_232.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7b84893429ce86708c59baf9577867b951598fe6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_232.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=LR
+	N0 [label=De_provisioning color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Password Management" color="#9575CD" fillcolor="#EDE7F6" shape=folder style=filled]
+	N2 [label="Identity Threat Detection and Response" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N3 [label="Data Encryption for Identity" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N4 [label="Identity Proofing" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N5 [label="Access Governance" color="#9575CD" fillcolor="#EDE7F6" shape=octagon style=filled]
+	N6 [label="User Registration" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N7 [label="KYC Integration" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+	N8 [label="API Security for Identity" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N9 [label="Digital Signatures" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+	N10 [label=Non_Repudiation color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Verifiable Credentials" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Consent Management" color="#9575CD" fillcolor="#EDE7F6" shape=octagon style=filled]
+		nest0_1 [label="Digital Certificates" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Decentralized Identifiers" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Identity Lifecycle Management" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+		nest1_1 [label="Compliance with Data Protection Regulations" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_2 [label="Digital Wallets for Identity" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+		nest1_3 [label="Fraud Detection in Identity" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="performs KYCs" color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N5 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [label="stores attributes" color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label="authorizes access" color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_232.txt b/test/graphviz/graph_hard/graphviz_232.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b8a7135ee68aea4e2fb2bc25d02f8fc824d30940
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_232.txt
@@ -0,0 +1,38 @@
+<API Security for Identity, connectedTo, Digital Signatures>
+<Access Governance, connectedTo, API Security for Identity>
+<Access Governance, connectedTo, Digital Signatures>
+<Access Governance, connectedTo, KYC Integration>
+<Access Governance, connectedTo, Non_Repudiation>
+<Access Governance, connectedTo, User Registration>
+<Compliance with Data Protection Regulations, connectedTo, Digital Wallets for Identity>
+<Compliance with Data Protection Regulations, partOf, Compliance with Data Protection Regulations>
+<Consent Management, connectedTo, Digital Certificates>
+<Consent Management, partOf, Consent Management>
+<Data Encryption for Identity, connectedTo, Digital Signatures>
+<Data Encryption for Identity, connectedTo, Identity Proofing>
+<Data Encryption for Identity, connectedTo, KYC Integration>
+<De_provisioning, connectedTo, KYC Integration>
+<De_provisioning, performs KYCs, Password Management>
+<Digital Certificates, connectedTo, Password Management>
+<Digital Certificates, partOf, Digital Certificates>
+<Digital Signatures, connectedTo, Non_Repudiation>
+<Digital Wallets for Identity, connectedTo, Fraud Detection in Identity>
+<Digital Wallets for Identity, partOf, Digital Wallets for Identity>
+<Fraud Detection in Identity, connectedTo, Access Governance>
+<Fraud Detection in Identity, partOf, Fraud Detection in Identity>
+<Identity Lifecycle Management, connectedTo, Compliance with Data Protection Regulations>
+<Identity Lifecycle Management, partOf, Identity Lifecycle Management>
+<Identity Proofing, connectedTo, Access Governance>
+<Identity Proofing, connectedTo, Digital Signatures>
+<Identity Threat Detection and Response, authorizes access, Digital Signatures>
+<Identity Threat Detection and Response, connectedTo, API Security for Identity>
+<Identity Threat Detection and Response, connectedTo, Consent Management>
+<Identity Threat Detection and Response, connectedTo, Data Encryption for Identity>
+<Identity Threat Detection and Response, connectedTo, KYC Integration>
+<Identity Threat Detection and Response, stores attributes, Access Governance>
+<KYC Integration, connectedTo, API Security for Identity>
+<Password Management, connectedTo, API Security for Identity>
+<Password Management, connectedTo, Identity Lifecycle Management>
+<Password Management, connectedTo, Identity Threat Detection and Response>
+<User Registration, connectedTo, Digital Signatures>
+<User Registration, connectedTo, KYC Integration>
diff --git a/test/graphviz/graph_hard/graphviz_234.dot b/test/graphviz/graph_hard/graphviz_234.dot
new file mode 100644
index 0000000000000000000000000000000000000000..704f18cf33b3e17fabc47011804bffd1eb924325
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_234.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Credential Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N1 [label="Digital Certificates" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N2 [label="Access Governance" color="#FFA726" fillcolor="#FFF3E0" shape=oval style=filled]
+	N3 [label="API Security for Identity" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N4 [label="Single Sign_On" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N5 [label="Data Minimization Principles" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N6 [label="Federated Identity Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N7 [label="Identity as a Service" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N8 [label="Social Login Integration" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N9 [label="Identity Threat Detection and Response" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N10 [label="Fraud Detection in Identity" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N11 [label="Consent Management" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N12 [label="Privacy Management" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N13 [label="Adaptive Authentication" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N14 [label="Decentralized Identifiers" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N15 [label="Biometric Authentication" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Attribute Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Customer Identity and Access Management" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label="Privileged Access Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=oval style=filled]
+		nest0_2 [label="Identity Lifecycle Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label=Authentication labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Identity Proofing" color="#FFA726" fillcolor="#FFF3E0" shape=plaintext style=filled]
+		nest1_1 [label=Authorization color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_2 [label="User Provisioning" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+		nest1_3 [label="Data Encryption for Identity" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="performs KYCs" color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest0_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest1_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label="provides verifiable proofs" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [label="authorizes access" color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N14 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_234.txt b/test/graphviz/graph_hard/graphviz_234.txt
new file mode 100644
index 0000000000000000000000000000000000000000..125d9fd851f17164f8c60e5348a1961a64fcd45b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_234.txt
@@ -0,0 +1,45 @@
+<API Security for Identity, connectedTo, Adaptive Authentication>
+<API Security for Identity, connectedTo, Decentralized Identifiers>
+<API Security for Identity, connectedTo, Single Sign_On>
+<Access Governance, connectedTo, API Security for Identity>
+<Access Governance, connectedTo, Adaptive Authentication>
+<Access Governance, connectedTo, Decentralized Identifiers>
+<Adaptive Authentication, connectedTo, Decentralized Identifiers>
+<Authorization, connectedTo, User Provisioning>
+<Authorization, partOf, Authorization>
+<Consent Management, connectedTo, Privacy Management>
+<Credential Management, connectedTo, Digital Certificates>
+<Customer Identity and Access Management, connectedTo, Privileged Access Management>
+<Customer Identity and Access Management, partOf, Customer Identity and Access Management>
+<Data Encryption for Identity, connectedTo, Decentralized Identifiers>
+<Data Encryption for Identity, partOf, Data Encryption for Identity>
+<Data Minimization Principles, connectedTo, Federated Identity Management>
+<Decentralized Identifiers, connectedTo, Biometric Authentication>
+<Decentralized Identifiers, connectedTo, Customer Identity and Access Management>
+<Digital Certificates, connectedTo, Access Governance>
+<Digital Certificates, connectedTo, Decentralized Identifiers>
+<Federated Identity Management, connectedTo, Adaptive Authentication>
+<Federated Identity Management, connectedTo, Decentralized Identifiers>
+<Federated Identity Management, connectedTo, Identity Threat Detection and Response>
+<Federated Identity Management, connectedTo, Identity as a Service>
+<Federated Identity Management, provides verifiable proofs, Social Login Integration>
+<Fraud Detection in Identity, connectedTo, Consent Management>
+<Identity Lifecycle Management, connectedTo, Consent Management>
+<Identity Lifecycle Management, partOf, Identity Lifecycle Management>
+<Identity Proofing, connectedTo, Authorization>
+<Identity Proofing, partOf, Identity Proofing>
+<Identity Threat Detection and Response, authorizes access, Consent Management>
+<Identity Threat Detection and Response, connectedTo, Biometric Authentication>
+<Identity Threat Detection and Response, connectedTo, Decentralized Identifiers>
+<Identity Threat Detection and Response, connectedTo, Fraud Detection in Identity>
+<Identity Threat Detection and Response, connectedTo, Privacy Management>
+<Identity as a Service, connectedTo, Adaptive Authentication>
+<Identity as a Service, connectedTo, Social Login Integration>
+<Privacy Management, connectedTo, Adaptive Authentication>
+<Privacy Management, connectedTo, Identity Proofing>
+<Privileged Access Management, connectedTo, Identity Lifecycle Management>
+<Privileged Access Management, partOf, Privileged Access Management>
+<Single Sign_On, connectedTo, Data Minimization Principles>
+<Social Login Integration, performs KYCs, Identity Threat Detection and Response>
+<User Provisioning, connectedTo, Data Encryption for Identity>
+<User Provisioning, partOf, User Provisioning>
diff --git a/test/graphviz/graph_hard/graphviz_235.txt b/test/graphviz/graph_hard/graphviz_235.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f9a52849c785186554e6c4cbfaf9e541f2d54c38
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_235.txt
@@ -0,0 +1,42 @@
+<Accessibility Features, connectedTo, Virtual Classroom Facilitation>
+<Accessibility Features, partOf, Accessibility Features>
+<Accreditation Management, connectedTo, Bootcamp Development>
+<Accreditation Management, connectedTo, Professional Development Courses>
+<Assessment Design, connectedTo, Accreditation Management>
+<Blended Learning Models, connectedTo, Bootcamp Development>
+<Blended Learning Models, connectedTo, Certification Issuance>
+<Blended Learning Models, connectedTo, Learning Analytics>
+<Blended Learning Models, connectedTo, Parent or Guardian Communication>
+<Blended Learning Models, protects data privacy, Virtual Field Trips>
+<Bootcamp Development, connectedTo, Certification Issuance>
+<Certification Issuance, connectedTo, Enrollment and Retention Strategies>
+<Certification Issuance, connectedTo, Learning Analytics>
+<Certification Issuance, connectedTo, Professional Development Courses>
+<Certification Issuance, simulates labs, Virtual Labs and Simulations>
+<Collaborative Projects, connectedTo, Competency_Based Education>
+<Competency_Based Education, connectedTo, Discussion Forum Moderation>
+<Course Evaluation, connectedTo, Collaborative Projects>
+<Discussion Forum Moderation, connectedTo, Learning Analytics>
+<Discussion Forum Moderation, connectedTo, Personalized Learning Paths>
+<Discussion Forum Moderation, connectedTo, Professional Development Courses>
+<Discussion Forum Moderation, tracks progress, Blended Learning Models>
+<Instructor Training, connectedTo, Accessibility Features>
+<Instructor Training, partOf, Instructor Training>
+<Learning Analytics, connectedTo, Parent or Guardian Communication>
+<Micro_credential Programs, connectedTo, Collaborative Projects>
+<Micro_credential Programs, partOf, Micro_credential Programs>
+<Open Educational Resources Integration, connectedTo, Instructor Training>
+<Open Educational Resources Integration, partOf, Open Educational Resources Integration>
+<Parent or Guardian Communication, connectedTo, Enrollment and Retention Strategies>
+<Peer_to_Peer Learning, connectedTo, Micro_credential Programs>
+<Peer_to_Peer Learning, partOf, Peer_to_Peer Learning>
+<Personalized Learning Paths, connectedTo, Open Educational Resources Integration>
+<Personalized Learning Paths, partOf, Personalized Learning Paths>
+<Professional Development Courses, connectedTo, Learning Analytics>
+<Virtual Classroom Facilitation, connectedTo, Peer_to_Peer Learning>
+<Virtual Classroom Facilitation, connectedTo, Professional Development Courses>
+<Virtual Field Trips, connectedTo, Assessment Design>
+<Virtual Field Trips, connectedTo, Enrollment and Retention Strategies>
+<Virtual Field Trips, connectedTo, Professional Development Courses>
+<Virtual Field Trips, creates analytics dashboards, Virtual Labs and Simulations>
+<Virtual Labs and Simulations, connectedTo, Virtual Classroom Facilitation>
diff --git a/test/graphviz/graph_hard/graphviz_236.dot b/test/graphviz/graph_hard/graphviz_236.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d0bf8e61f02f90caca3a1779670ed65b832dec8a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_236.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Accreditation Management" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Course Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N2 [label="Virtual Classroom Facilitation" color="#AF56A6" fillcolor="#DDCEDD" shape=oval style=filled]
+	N3 [label="Content Creation" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N4 [label="Certification Issuance" color="#795548" fillcolor="#D7CCC8" shape=oval style=filled]
+	N5 [label="Learning Analytics" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N6 [label="Student Progress Tracking" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+	N7 [label="Technical Support for Students" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N8 [label="Test Preparation Courses" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N9 [label="Curriculum Development" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N10 [label="Micro_credential Programs" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N11 [label="Collaborative Projects" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N12 [label="Parent or Guardian Communication" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="AI in Online Education" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Peer_to_Peer Learning" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+		nest0_1 [label="Gamification in Education" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_2 [label="Blended Learning Models" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest0_3 [label="Synchronous Learning" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [label="uses AR or VR for learning" color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Online Tutoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Assessment Design" color="#795548" fillcolor="#D7CCC8" shape=octagon style=filled]
+		nest1_1 [label="Course Evaluation" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+		nest1_2 [label="Instructor Training" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label="personalizes learning" color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label="delivers lectures" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label="offers online tutoring" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_238.dot b/test/graphviz/graph_hard/graphviz_238.dot
new file mode 100644
index 0000000000000000000000000000000000000000..93feef2030c766b5255b2945e55f66770c5cc055
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_238.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=TD
+	N0 [label="Continuous Course Improvement" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Technical Infrastructure for Scale" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N2 [label="Video Lecture Production" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N3 [label="Employer Recognition" color="#A1D7CD" fillcolor="#EDF5F3" shape=octagon style=filled]
+	N4 [label="Corporate Training Solutions" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N5 [label="Course Pilot Testing" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Career Pathway Mapping" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N7 [label="Gamification for Engagement" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N8 [label="Mobile Learning Experience" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label="Platform Selection" color="#A1D7CD" fillcolor="#EDF5F3" shape=plaintext style=filled]
+	N10 [label="Verified Track Management" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N11 [label="Subscription Models" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N12 [label="Learner Feedback Analysis" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N13 [label="Skill_Based Learning Outcomes" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N14 [label="Industry Collaboration for Content" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N15 [label="Discussion Forum Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N16 [label="Completion Rate Optimization" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N17 [label="Marketing to Global Audience" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N18 [label="University Partnerships" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N19 [label="Micro_credential Stacking" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Instructor_Led Sessions" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Financial Aid for Learners" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+		nest0_1 [label="Self_Paced Learning Tracks" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Translation and Localization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Peer Grading Implementation" color="#A1D7CD" fillcolor="#EDF5F3" shape=octagon style=filled]
+		nest1_1 [label="Certificate of Completion Issuance" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+		nest1_2 [label="Course Retirement Planning" color="#DCE775" fillcolor="#F9FBE7" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [label="supports learners" color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [label="expands reach" color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N9 -> S2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S2 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label="issues statements of accomplishment" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_239.txt b/test/graphviz/graph_hard/graphviz_239.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0611fe6b87be1884c8898e0704ca76edf3398a2f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_239.txt
@@ -0,0 +1,28 @@
+<Content Licensing, connectedTo, Learner Support>
+<Corporate Training Solutions, connectedTo, Industry Collaboration for Content>
+<Corporate Training Solutions, connectedTo, Video Lecture Production>
+<Course Content Development, connectedTo, Mobile Learning Experience>
+<Course Content Development, partOf, Course Content Development>
+<Employer Recognition, connectedTo, Course Content Development>
+<Employer Recognition, partOf, Employer Recognition>
+<Gamification for Engagement, connectedTo, Translation and Localization>
+<Global Accessibility Features, connectedTo, Learner Feedback Analysis>
+<Global Accessibility Features, connectedTo, Translation and Localization>
+<Industry Collaboration for Content, connectedTo, Subscription Models>
+<Industry Collaboration for Content, partOf, Industry Collaboration for Content>
+<Learner Feedback Analysis, connectedTo, Mobile Learning Experience>
+<Learner Feedback Analysis, connectedTo, Translation and Localization>
+<Learner Support, connectedTo, Global Accessibility Features>
+<Mobile Learning Experience, connectedTo, Corporate Training Solutions>
+<Mobile Learning Experience, connectedTo, Gamification for Engagement>
+<Mobile Learning Experience, connectedTo, Peer Grading Implementation>
+<Mobile Learning Experience, connectedTo, Translation and Localization>
+<Mobile Learning Experience, connectedTo, Video Lecture Production>
+<Peer Grading Implementation, connectedTo, Instructor_Led Sessions>
+<Subscription Models, connectedTo, Gamification for Engagement>
+<Subscription Models, partOf, Subscription Models>
+<Translation and Localization, connectedTo, Peer Grading Implementation>
+<Translation and Localization, connectedTo, University Partnerships>
+<University Partnerships, connectedTo, Employer Recognition>
+<University Partnerships, partOf, University Partnerships>
+<Video Lecture Production, connectedTo, Gamification for Engagement>
diff --git a/test/graphviz/graph_hard/graphviz_240.dot b/test/graphviz/graph_hard/graphviz_240.dot
new file mode 100644
index 0000000000000000000000000000000000000000..59c1ddc95be86bbd947f189cefa7d4447b060861
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_240.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="Career Pathway Mapping" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Platform Selection" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	N2 [label="Peer Grading Implementation" color="#D2D2D2" fillcolor="#F0F0F0" shape=diamond style=filled]
+	N3 [label="University Partnerships" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N4 [label="Assessment Creation" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N5 [label="Financial Aid for Learners" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	N6 [label="Gamification for Engagement" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+	N7 [label="Skill_Based Learning Outcomes" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Corporate Training Solutions" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N9 [label="Discussion Forum Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N10 [label="Self_Paced Learning Tracks" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N11 [label="Course Pilot Testing" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Certificate of Completion Issuance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Course Promotion" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+		nest0_1 [label="Engagement Metrics Tracking" color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Mobile Learning Experience" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Course Retirement Planning" color="#673AB7" fillcolor="#D1C4E9" shape=octagon style=filled]
+		nest1_1 [label="Verified Track Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="offers assignments" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="manages registrations" color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="analyzes data" color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N2 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label="integrates videos" color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [label="develops content" color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_240.txt b/test/graphviz/graph_hard/graphviz_240.txt
new file mode 100644
index 0000000000000000000000000000000000000000..59278e1a6d66f81e9d4c327115ce6ff549f1eb30
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_240.txt
@@ -0,0 +1,30 @@
+<Assessment Creation, connectedTo, Discussion Forum Management>
+<Assessment Creation, connectedTo, Financial Aid for Learners>
+<Assessment Creation, connectedTo, Skill_Based Learning Outcomes>
+<Career Pathway Mapping, connectedTo, Discussion Forum Management>
+<Career Pathway Mapping, connectedTo, Platform Selection>
+<Corporate Training Solutions, manages registrations, Discussion Forum Management>
+<Course Promotion, connectedTo, Engagement Metrics Tracking>
+<Course Promotion, partOf, Course Promotion>
+<Course Retirement Planning, connectedTo, Verified Track Management>
+<Course Retirement Planning, partOf, Course Retirement Planning>
+<Discussion Forum Management, analyzes data, Self_Paced Learning Tracks>
+<Discussion Forum Management, connectedTo, Course Promotion>
+<Engagement Metrics Tracking, connectedTo, University Partnerships>
+<Engagement Metrics Tracking, partOf, Engagement Metrics Tracking>
+<Financial Aid for Learners, connectedTo, Discussion Forum Management>
+<Financial Aid for Learners, connectedTo, Gamification for Engagement>
+<Gamification for Engagement, connectedTo, Skill_Based Learning Outcomes>
+<Gamification for Engagement, develops content, Discussion Forum Management>
+<Peer Grading Implementation, connectedTo, University Partnerships>
+<Platform Selection, connectedTo, Peer Grading Implementation>
+<Self_Paced Learning Tracks, connectedTo, Course Pilot Testing>
+<Self_Paced Learning Tracks, connectedTo, Course Retirement Planning>
+<Skill_Based Learning Outcomes, offers assignments, Corporate Training Solutions>
+<University Partnerships, connectedTo, Assessment Creation>
+<University Partnerships, connectedTo, Discussion Forum Management>
+<University Partnerships, connectedTo, Gamification for Engagement>
+<University Partnerships, connectedTo, Skill_Based Learning Outcomes>
+<University Partnerships, integrates videos, Discussion Forum Management>
+<Verified Track Management, connectedTo, Peer Grading Implementation>
+<Verified Track Management, partOf, Verified Track Management>
diff --git a/test/graphviz/graph_hard/graphviz_241.dot b/test/graphviz/graph_hard/graphviz_241.dot
new file mode 100644
index 0000000000000000000000000000000000000000..782d4db9f2db0806cd8fdadae78db3aeba4355de
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_241.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=RL
+	N0 [label="Memory Techniques Training" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N1 [label="Subject Matter Review" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N2 [label="Study Environment Optimization" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N3 [label="Motivation Coaching" color="#9C27B0" fillcolor="#E1BEE7" shape=Mdiamond style=filled]
+	N4 [label="Time Management Coaching" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N5 [label="Professional Licensure Exam Prep" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N6 [label="Flashcard Creation" color="#9C27B0" fillcolor="#E1BEE7" shape=octagon style=filled]
+	N7 [label="Video Lecture Production" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+	N8 [label="Parent or Guardian Updates" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N9 [label="Exam Day Tips" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N10 [label="Test_Taking Strategies" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N11 [label="Certification Exam Prep" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N12 [label="Mock Exam Administration" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N13 [label="Interactive Exercises" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Performance Prediction Models" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Virtual Proctoring" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_1 [label="Performance Feedback" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+		nest0_2 [label="Study Material Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=prepares color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Science Concept Review" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Curriculum Development" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest1_1 [label="Graduate School Exam Prep" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+		nest1_2 [label="Adaptive Learning Algorithms" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=facilitates color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
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+	N7 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=provides color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N4 [label=coaches color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N10 [label=develops color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [label=improves color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_247.dot b/test/graphviz/graph_hard/graphviz_247.dot
new file mode 100644
index 0000000000000000000000000000000000000000..859bb7c052cd08664835504e8df0bc53ef66f4e6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_247.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Depression Treatment" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="Workplace Mental Health Programs" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N2 [label="Trauma Therapy" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N3 [label="Crisis Intervention" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N4 [label="Mental Health Education" color="#A188DB" fillcolor="#DED7F0" shape=folder style=filled]
+	N5 [label="Child & Adolescent Therapy" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N6 [label="Mindfulness Practice" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N7 [label="Schizophrenia Management" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N8 [label="Mental Health Screening" color="#AED581" fillcolor="#F0F4C3" shape=oval style=filled]
+	N9 [label="Grief Counseling" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N10 [label="Inpatient Treatment Coordination" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Eating Disorder Treatment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Digital Mental Health Tools" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+		nest0_1 [label="Advocacy for Mental Health" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+		nest0_2 [label="Therapy Session" color="#A188DB" fillcolor="#DED7F0" shape=oval style=filled]
+		nest0_3 [label="Treatment Plan Development" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Outpatient Program Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Group Therapy" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest1_1 [label="Art Therapy" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+		nest1_2 [label="Relapse Prevention" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest1_3 [label="Bipolar Disorder Management" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
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+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=educates color="#000000" dir=forward penwidth=1.5 style=solid]
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+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	N4 -> nest1_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S2 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [label=audits color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=reduces color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+}
diff --git a/test/graphviz/graph_hard/graphviz_247.txt b/test/graphviz/graph_hard/graphviz_247.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cae1cadc74dca58cf4a9bff161c3f8f1db84d8b9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_247.txt
@@ -0,0 +1,37 @@
+<Advocacy for Mental Health, connectedTo, Therapy Session>
+<Advocacy for Mental Health, partOf, Advocacy for Mental Health>
+<Art Therapy, connectedTo, Relapse Prevention>
+<Art Therapy, partOf, Art Therapy>
+<Bipolar Disorder Management, connectedTo, Mental Health Screening>
+<Bipolar Disorder Management, partOf, Bipolar Disorder Management>
+<Child & Adolescent Therapy, connectedTo, Digital Mental Health Tools>
+<Child & Adolescent Therapy, connectedTo, Mental Health Screening>
+<Child & Adolescent Therapy, connectedTo, Mindfulness Practice>
+<Crisis Intervention, connectedTo, Child & Adolescent Therapy>
+<Crisis Intervention, connectedTo, Mental Health Education>
+<Crisis Intervention, connectedTo, Mental Health Screening>
+<Depression Treatment, connectedTo, Workplace Mental Health Programs>
+<Digital Mental Health Tools, connectedTo, Advocacy for Mental Health>
+<Digital Mental Health Tools, partOf, Digital Mental Health Tools>
+<Grief Counseling, connectedTo, Inpatient Treatment Coordination>
+<Group Therapy, connectedTo, Art Therapy>
+<Group Therapy, partOf, Group Therapy>
+<Mental Health Education, connectedTo, Child & Adolescent Therapy>
+<Mental Health Education, connectedTo, Group Therapy>
+<Mental Health Screening, connectedTo, Grief Counseling>
+<Mindfulness Practice, educates, Schizophrenia Management>
+<Relapse Prevention, connectedTo, Bipolar Disorder Management>
+<Relapse Prevention, partOf, Relapse Prevention>
+<Schizophrenia Management, audits, Grief Counseling>
+<Schizophrenia Management, connectedTo, Inpatient Treatment Coordination>
+<Schizophrenia Management, connectedTo, Mental Health Screening>
+<Therapy Session, connectedTo, Treatment Plan Development>
+<Therapy Session, partOf, Therapy Session>
+<Trauma Therapy, connectedTo, Crisis Intervention>
+<Trauma Therapy, connectedTo, Grief Counseling>
+<Trauma Therapy, connectedTo, Mental Health Screening>
+<Trauma Therapy, connectedTo, Schizophrenia Management>
+<Treatment Plan Development, medicates, Crisis Intervention>
+<Treatment Plan Development, partOf, Treatment Plan Development>
+<Workplace Mental Health Programs, connectedTo, Trauma Therapy>
+<Workplace Mental Health Programs, reduces, Mental Health Screening>
diff --git a/test/graphviz/graph_hard/graphviz_248.txt b/test/graphviz/graph_hard/graphviz_248.txt
new file mode 100644
index 0000000000000000000000000000000000000000..683abf8c9fa6f013dce808008ee82dd8e9b5ad54
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_248.txt
@@ -0,0 +1,41 @@
+<Advocacy for Mental Health, connectedTo, Group Therapy>
+<Anxiety Management, connectedTo, Advocacy for Mental Health>
+<Anxiety Management, connectedTo, Treatment Plan Development>
+<Art Therapy, connectedTo, Eating Disorder Treatment>
+<Art Therapy, connectedTo, Treatment Plan Development>
+<Bipolar Disorder Management, connectedTo, Coping Skill Development>
+<Child & Adolescent Therapy, connectedTo, Post_Traumatic Stress Disorder Support>
+<Coping Skill Development, researches, Mental Health Screening>
+<Crisis Intervention, connectedTo, Digital Mental Health Tools>
+<Crisis Intervention, connectedTo, Treatment Plan Development>
+<Depression Treatment, connectedTo, Bipolar Disorder Management>
+<Dialectical Behavior Therapy, connectedTo, Anxiety Management>
+<Dialectical Behavior Therapy, connectedTo, Support Group Facilitation>
+<Digital Mental Health Tools, connectedTo, Mental Health Education>
+<Eating Disorder Treatment, connectedTo, Treatment Plan Development>
+<Eating Disorder Treatment, secures, Emotional Regulation Training>
+<Emotional Regulation Training, connectedTo, Dialectical Behavior Therapy>
+<Family Therapy, connectedTo, Treatment Plan Development>
+<Group Therapy, connectedTo, Child & Adolescent Therapy>
+<Group Therapy, connectedTo, Depression Treatment>
+<Group Therapy, connectedTo, Family Therapy>
+<Group Therapy, connectedTo, Treatment Plan Development>
+<Group Therapy, innovates, Coping Skill Development>
+<Medication Management, connectedTo, Substance Abuse Counseling>
+<Medication Management, partOf, Medication Management>
+<Mental Health Education, connectedTo, Advocacy for Mental Health>
+<Mental Health Education, connectedTo, Art Therapy>
+<Mental Health Education, connectedTo, Music Therapy>
+<Mental Health Education, connectedTo, Treatment Plan Development>
+<Mental Health Screening, connectedTo, Child & Adolescent Therapy>
+<Music Therapy, connectedTo, Art Therapy>
+<Music Therapy, connectedTo, Medication Management>
+<Recreational Therapy, connectedTo, Advocacy for Mental Health>
+<Recreational Therapy, partOf, Recreational Therapy>
+<Schizophrenia Management, connectedTo, Crisis Intervention>
+<Substance Abuse Counseling, connectedTo, Bipolar Disorder Management>
+<Substance Abuse Counseling, partOf, Substance Abuse Counseling>
+<Support Group Facilitation, develops, Recreational Therapy>
+<Support Group Facilitation, partOf, Support Group Facilitation>
+<Treatment Plan Development, connectedTo, Depression Treatment>
+<Workplace Mental Health Programs, educates, Schizophrenia Management>
diff --git a/test/graphviz/graph_hard/graphviz_249.txt b/test/graphviz/graph_hard/graphviz_249.txt
new file mode 100644
index 0000000000000000000000000000000000000000..54388bad8649a994df27158b01de93d2a7473547
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_249.txt
@@ -0,0 +1,35 @@
+<Child & Adolescent Therapy, connectedTo, Relapse Prevention>
+<Cognitive Behavioral Therapy, connectedTo, Digital Mental Health Tools>
+<Coping Skill Development, connectedTo, Mental Health Screening>
+<Depression Treatment, connectedTo, Grief Counseling>
+<Depression Treatment, connectedTo, Workplace Mental Health Programs>
+<Diagnosis and Assessment, innovates, Recreational Therapy>
+<Diagnosis and Assessment, partOf, Diagnosis and Assessment>
+<Digital Mental Health Tools, connectedTo, Mental Health Education>
+<Emotional Regulation Training, connectedTo, Diagnosis and Assessment>
+<Emotional Regulation Training, partOf, Emotional Regulation Training>
+<Group Therapy, connectedTo, Recreational Therapy>
+<Group Therapy, partOf, Group Therapy>
+<Medication Management, connectedTo, Grief Counseling>
+<Mental Health Education, connectedTo, Recreational Therapy>
+<Mental Health Screening, connectedTo, Depression Treatment>
+<Peer Support Programs, medicates, Trauma Therapy>
+<Post_Traumatic Stress Disorder Support, connectedTo, Group Therapy>
+<Post_Traumatic Stress Disorder Support, partOf, Post_Traumatic Stress Disorder Support>
+<Recreational Therapy, connectedTo, Emotional Regulation Training>
+<Recreational Therapy, trains, Child & Adolescent Therapy>
+<Relapse Prevention, connectedTo, Coping Skill Development>
+<Relapse Prevention, connectedTo, Grief Counseling>
+<Substance Abuse Counseling, connectedTo, Relapse Prevention>
+<Substance Abuse Counseling, connectedTo, Suicide Prevention>
+<Suicide Prevention, connectedTo, Cognitive Behavioral Therapy>
+<Suicide Prevention, connectedTo, Recreational Therapy>
+<Suicide Prevention, connectedTo, Relapse Prevention>
+<Suicide Prevention, facilitates, Medication Management>
+<Telehealth Counseling, connectedTo, Relapse Prevention>
+<Telehealth Counseling, connectedTo, Substance Abuse Counseling>
+<Trauma Therapy, connectedTo, Telehealth Counseling>
+<Trauma Therapy, protects, Treatment Plan Development>
+<Treatment Plan Development, guides, Post_Traumatic Stress Disorder Support>
+<Treatment Plan Development, partOf, Treatment Plan Development>
+<Workplace Mental Health Programs, connectedTo, Medication Management>
diff --git a/test/graphviz/graph_hard/graphviz_250.txt b/test/graphviz/graph_hard/graphviz_250.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f2035e7e51ffee4e44868f050c1d18357d922cb6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_250.txt
@@ -0,0 +1,41 @@
+<Child Nutrition, connectedTo, Personalized Nutrition Plans>
+<Child Nutrition, connectedTo, Public Health Nutrition Programs>
+<Child Nutrition, connectedTo, Sustainable Food Systems>
+<Child Nutrition, develops, Food Safety Education>
+<Child Nutrition, researches, Eating Habit Modification>
+<Detoxification Programs, connectedTo, Nutritional Counseling>
+<Detoxification Programs, partOf, Detoxification Programs>
+<Dietary Assessment, connectedTo, Recipe Adaptation>
+<Disease_Specific Nutrition, connectedTo, Public Health Nutrition Programs>
+<Disease_Specific Nutrition, partOf, Disease_Specific Nutrition>
+<Eating Habit Modification, connectedTo, Gut Microbiome Health>
+<Elderly Nutrition, connectedTo, Food Allergy Management>
+<Food Allergy Management, connectedTo, Sustainable Food Systems>
+<Food Preparation Guidance, connectedTo, Food Service Management Consulting>
+<Food Preparation Guidance, partOf, Food Preparation Guidance>
+<Food Safety Education, connectedTo, Public Health Nutrition Programs>
+<Food Safety Education, filters, Food Preparation Guidance>
+<Food Service Management Consulting, monitors, Detoxification Programs>
+<Food Service Management Consulting, partOf, Food Service Management Consulting>
+<Grocery Shopping Guidance, connectedTo, Nutrigenomics Research>
+<Grocery Shopping Guidance, connectedTo, Personalized Nutrition Plans>
+<Grocery Shopping Guidance, connectedTo, Public Health Nutrition Programs>
+<Gut Microbiome Health, connectedTo, Elderly Nutrition>
+<Gut Microbiome Health, connectedTo, Macronutrient Tracking>
+<Hydration Planning, connectedTo, Disease_Specific Nutrition>
+<Hydration Planning, partOf, Hydration Planning>
+<Inflammation and Diet, connectedTo, Personalized Nutrition Plans>
+<Inflammation and Diet, sources, Nutritional Counseling>
+<Macronutrient Tracking, connectedTo, Hydration Planning>
+<Macronutrient Tracking, partOf, Macronutrient Tracking>
+<Meal Planning, connectedTo, Grocery Shopping Guidance>
+<Metabolism Rate Assessment, connectedTo, Meal Planning>
+<Micronutrient Analysis, connectedTo, Metabolism Rate Assessment>
+<Nutrigenomics Research, connectedTo, Child Nutrition>
+<Nutritional Counseling, regulates, Personalized Nutrition Plans>
+<Personalized Nutrition Plans, connectedTo, Eating Habit Modification>
+<Public Health Nutrition Programs, connectedTo, Sports Nutrition>
+<Recipe Adaptation, connectedTo, Micronutrient Analysis>
+<Recipe Adaptation, connectedTo, Personalized Nutrition Plans>
+<Sports Nutrition, connectedTo, Inflammation and Diet>
+<Weight Management, connectedTo, Dietary Assessment>
diff --git a/test/graphviz/graph_hard/graphviz_252.dot b/test/graphviz/graph_hard/graphviz_252.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5dcef3155a69b47df00be53206d7c1bf735010cc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_252.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Food Waste Reduction" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N1 [label="Food Label Interpretation" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N2 [label="Public Health Nutrition Programs" color="#B0C5CD" fillcolor="#DFE7EB" shape=oval style=filled]
+	N3 [label="Inflammation and Diet" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N4 [label="Clinical Nutrition Support" color="#B0C5CD" fillcolor="#DFE7EB" shape=plaintext style=filled]
+	N5 [label="Gut Microbiome Health" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N6 [label="Metabolism Rate Assessment" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N7 [label="Food Service Management Consulting" color="#7E57C2" fillcolor="#EDE7F6" shape=folder style=filled]
+	N8 [label="Disease_Specific Nutrition" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N9 [label="Macronutrient Tracking" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N10 [label="Dietary Software Usage" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N11 [label="Food Fortification Strategies" color="#B0C5CD" fillcolor="#DFE7EB" shape=folder style=filled]
+	N12 [label="Personalized Nutrition Plans" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Supplement Recommendation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Detoxification Programs" color="#B0C5CD" fillcolor="#DFE7EB" shape=folder style=filled]
+		nest0_1 [label="Nutritional Biomarker Analysis" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Hydration Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Child Nutrition" color="#B0C5CD" fillcolor="#DFE7EB" shape=Mdiamond style=filled]
+		nest1_1 [label="Sports Nutrition" color="#B0C5CD" fillcolor="#DFE7EB" shape=octagon style=filled]
+		nest1_2 [label="Maternal Nutrition" color="#B0C5CD" fillcolor="#DFE7EB" shape=diamond style=filled]
+		nest1_3 [label="Food Allergy Management" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=prevents color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [label=cooks color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label=promotes color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [label=assesses color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=certifies color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=manages color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_252.txt b/test/graphviz/graph_hard/graphviz_252.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6ff2fa9e0d240fce539dee326adbae709aad6134
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_252.txt
@@ -0,0 +1,39 @@
+<Child Nutrition, connectedTo, Sports Nutrition>
+<Child Nutrition, partOf, Child Nutrition>
+<Clinical Nutrition Support, connectedTo, Dietary Software Usage>
+<Clinical Nutrition Support, connectedTo, Food Fortification Strategies>
+<Clinical Nutrition Support, connectedTo, Gut Microbiome Health>
+<Clinical Nutrition Support, connectedTo, Personalized Nutrition Plans>
+<Detoxification Programs, connectedTo, Nutritional Biomarker Analysis>
+<Detoxification Programs, partOf, Detoxification Programs>
+<Dietary Software Usage, connectedTo, Child Nutrition>
+<Dietary Software Usage, connectedTo, Food Fortification Strategies>
+<Disease_Specific Nutrition, connectedTo, Macronutrient Tracking>
+<Food Allergy Management, cooks, Public Health Nutrition Programs>
+<Food Allergy Management, partOf, Food Allergy Management>
+<Food Fortification Strategies, connectedTo, Personalized Nutrition Plans>
+<Food Label Interpretation, connectedTo, Dietary Software Usage>
+<Food Label Interpretation, connectedTo, Public Health Nutrition Programs>
+<Food Label Interpretation, manages, Metabolism Rate Assessment>
+<Food Service Management Consulting, connectedTo, Dietary Software Usage>
+<Food Service Management Consulting, connectedTo, Disease_Specific Nutrition>
+<Food Service Management Consulting, promotes, Food Fortification Strategies>
+<Food Waste Reduction, connectedTo, Metabolism Rate Assessment>
+<Food Waste Reduction, prevents, Food Label Interpretation>
+<Gut Microbiome Health, connectedTo, Dietary Software Usage>
+<Gut Microbiome Health, connectedTo, Metabolism Rate Assessment>
+<Inflammation and Diet, connectedTo, Clinical Nutrition Support>
+<Inflammation and Diet, connectedTo, Detoxification Programs>
+<Macronutrient Tracking, connectedTo, Dietary Software Usage>
+<Maternal Nutrition, connectedTo, Food Allergy Management>
+<Maternal Nutrition, partOf, Maternal Nutrition>
+<Metabolism Rate Assessment, connectedTo, Food Service Management Consulting>
+<Nutritional Biomarker Analysis, connectedTo, Food Service Management Consulting>
+<Nutritional Biomarker Analysis, partOf, Nutritional Biomarker Analysis>
+<Public Health Nutrition Programs, assesses, Disease_Specific Nutrition>
+<Public Health Nutrition Programs, certifies, Metabolism Rate Assessment>
+<Public Health Nutrition Programs, connectedTo, Clinical Nutrition Support>
+<Public Health Nutrition Programs, connectedTo, Inflammation and Diet>
+<Public Health Nutrition Programs, connectedTo, Personalized Nutrition Plans>
+<Sports Nutrition, connectedTo, Maternal Nutrition>
+<Sports Nutrition, partOf, Sports Nutrition>
diff --git a/test/graphviz/graph_hard/graphviz_254.txt b/test/graphviz/graph_hard/graphviz_254.txt
new file mode 100644
index 0000000000000000000000000000000000000000..be521575a044215c0de779c5e68a6c0320aa18f7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_254.txt
@@ -0,0 +1,39 @@
+<Biometric Feedback Integration, connectedTo, HIIT Workouts>
+<Biometric Feedback Integration, partOf, Biometric Feedback Integration>
+<Cardiovascular Training, connectedTo, Functional Fitness Training>
+<Cardiovascular Training, connectedTo, Senior Fitness Programs>
+<Endurance Training, connects, Workout Tracking Apps>
+<Endurance Training, partOf, Endurance Training>
+<Fitness Assessment, connectedTo, Personal Training>
+<Fitness Assessment, connectedTo, Sports_Specific Training>
+<Flexibility Training, connectedTo, Outdoor Fitness Activities>
+<HIIT Workouts, connectedTo, Cardiovascular Training>
+<HIIT Workouts, partOf, HIIT Workouts>
+<Hydration for Exercise, connectedTo, Cardiovascular Training>
+<Hydration for Exercise, connectedTo, Functional Fitness Training>
+<Hydration for Exercise, connectedTo, Nutrition for Fitness>
+<Injury Prevention, connectedTo, Hydration for Exercise>
+<Injury Prevention, designs, Outdoor Fitness Activities>
+<Injury Prevention, prevents, Flexibility Training>
+<Nutrition for Fitness, connectedTo, Cardiovascular Training>
+<Nutrition for Fitness, connectedTo, Functional Fitness Training>
+<Outdoor Fitness Activities, connectedTo, Fitness Assessment>
+<Outdoor Fitness Activities, connectedTo, Functional Fitness Training>
+<Outdoor Fitness Activities, connectedTo, Hydration for Exercise>
+<Personal Training, connectedTo, Yoga Instruction>
+<Personalized Exercise Prescriptions, connectedTo, Biometric Feedback Integration>
+<Personalized Exercise Prescriptions, connectedTo, Cardiovascular Training>
+<Personalized Exercise Prescriptions, connectedTo, Functional Fitness Training>
+<Personalized Exercise Prescriptions, connectedTo, Hydration for Exercise>
+<Posture Correction, connectedTo, Personalized Exercise Prescriptions>
+<Senior Fitness Programs, connectedTo, Functional Fitness Training>
+<Sports_Specific Training, consults, Endurance Training>
+<Sports_Specific Training, partOf, Sports_Specific Training>
+<Wearable Fitness Devices, connectedTo, Injury Prevention>
+<Wearable Fitness Devices, connectedTo, Outdoor Fitness Activities>
+<Workout Tracking Apps, connectedTo, Injury Prevention>
+<Workout Tracking Apps, partOf, Workout Tracking Apps>
+<Yoga Instruction, connectedTo, Posture Correction>
+<Youth Fitness Programs, connectedTo, Hydration for Exercise>
+<Youth Fitness Programs, connectedTo, Outdoor Fitness Activities>
+<Youth Fitness Programs, connectedTo, Wearable Fitness Devices>
diff --git a/test/graphviz/graph_hard/graphviz_255.dot b/test/graphviz/graph_hard/graphviz_255.dot
new file mode 100644
index 0000000000000000000000000000000000000000..488dc562239f8cd10d8a49050cb2bfde3c573512
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_255.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Strength Training" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Outdoor Fitness Activities" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N2 [label="Cardiovascular Training" color="#82DAFF" fillcolor="#C8EDFF" shape=Mdiamond style=filled]
+	N3 [label="Biometric Feedback Integration" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N4 [label="Injury Prevention" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N5 [label="Workout Tracking Apps" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N6 [label="Fitness Equipment Maintenance" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N7 [label="Online Fitness Coaching" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N8 [label="Community Fitness Challenges" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Workout Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fitness Assessment" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+		nest0_1 [label="Sports_Specific Training" color="#82DAFF" fillcolor="#C8EDFF" shape=Mdiamond style=filled]
+		nest0_2 [label="Senior Fitness Programs" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+		nest0_3 [label="Weightlifting Techniques" color="#82DAFF" fillcolor="#C8EDFF" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Group Fitness Classes" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Posture Correction" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+		nest1_1 [label="Hydration for Exercise" color="#82DAFF" fillcolor="#C8EDFF" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [label=consults color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_255.txt b/test/graphviz/graph_hard/graphviz_255.txt
new file mode 100644
index 0000000000000000000000000000000000000000..65d4a6baaf68093f440453d28f6416cbe38d97e9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_255.txt
@@ -0,0 +1,31 @@
+<Biometric Feedback Integration, connectedTo, Injury Prevention>
+<Biometric Feedback Integration, connectedTo, Posture Correction>
+<Cardiovascular Training, connectedTo, Biometric Feedback Integration>
+<Cardiovascular Training, connectedTo, Fitness Equipment Maintenance>
+<Fitness Assessment, connectedTo, Sports_Specific Training>
+<Fitness Assessment, partOf, Fitness Assessment>
+<Fitness Equipment Maintenance, connectedTo, Online Fitness Coaching>
+<Hydration for Exercise, connectedTo, Online Fitness Coaching>
+<Hydration for Exercise, partOf, Hydration for Exercise>
+<Injury Prevention, connectedTo, Fitness Assessment>
+<Injury Prevention, connectedTo, Workout Tracking Apps>
+<Online Fitness Coaching, connectedTo, Community Fitness Challenges>
+<Outdoor Fitness Activities, connectedTo, Biometric Feedback Integration>
+<Outdoor Fitness Activities, connectedTo, Cardiovascular Training>
+<Outdoor Fitness Activities, connectedTo, Community Fitness Challenges>
+<Outdoor Fitness Activities, connectedTo, Injury Prevention>
+<Posture Correction, connectedTo, Hydration for Exercise>
+<Posture Correction, partOf, Posture Correction>
+<Senior Fitness Programs, connectedTo, Weightlifting Techniques>
+<Senior Fitness Programs, partOf, Senior Fitness Programs>
+<Sports_Specific Training, connectedTo, Senior Fitness Programs>
+<Sports_Specific Training, partOf, Sports_Specific Training>
+<Strength Training, connectedTo, Community Fitness Challenges>
+<Strength Training, connectedTo, Fitness Equipment Maintenance>
+<Strength Training, connectedTo, Injury Prevention>
+<Strength Training, connectedTo, Online Fitness Coaching>
+<Strength Training, connectedTo, Outdoor Fitness Activities>
+<Strength Training, consults, Cardiovascular Training>
+<Weightlifting Techniques, connectedTo, Injury Prevention>
+<Weightlifting Techniques, partOf, Weightlifting Techniques>
+<Workout Tracking Apps, connectedTo, Fitness Equipment Maintenance>
diff --git a/test/graphviz/graph_hard/graphviz_256.dot b/test/graphviz/graph_hard/graphviz_256.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a26c2fe6479a7307b9a9d926b1f7f17901f45e20
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_256.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TD
+	N0 [label="Social Connection Enhancement" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Alternative Therapies" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N2 [label="Journaling for Wellness" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N3 [label="Emotional Well_being" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N4 [label="Gratitude Practice" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+	N5 [label="Community Wellness Programs" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+	N6 [label="Digital Detox" color="#4DD0E1" fillcolor="#C9F0F0" shape=Mdiamond style=filled]
+	N7 [label=Hydrotherapy color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+	N8 [label="Detox Programs" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+	N9 [label="Mindfulness Practice" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+	N10 [label="Gut Health for Wellness" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Biofeedback Training" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Sleep Optimization" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+		nest0_1 [label="Longevity Planning" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest0_2 [label="Proactive Health Management" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=balances color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Resilience Building" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Employee Wellness Programs" color="#BCB88A" fillcolor="#F5F5DC" shape=Mdiamond style=filled]
+		nest1_1 [label="Health Coaching" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+		nest1_2 [label="Burnout Prevention" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [label=programs color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=personalizes color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N6 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [label=assesses color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_258.dot b/test/graphviz/graph_hard/graphviz_258.dot
new file mode 100644
index 0000000000000000000000000000000000000000..450d653ab983721ed6e7037fd418379b9c68c7c5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_258.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Self_Care Routine Development" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N1 [label="Acupuncture Consultation" color="#B8C0F5" fillcolor="#ECF0FD" shape=folder style=filled]
+	N2 [label="Aromatherapy Usage" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	N3 [label="Behavior Change Support" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N4 [label="Stress Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=Mdiamond style=filled]
+	N5 [label="Gratitude Practice" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+	N6 [label=Hydrotherapy color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N7 [label="Biofeedback Training" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N8 [label="Breathwork Exercises" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+	N9 [label="Employee Wellness Programs" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+	N10 [label="Meditation Coaching" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N11 [label="Detox Programs" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N12 [label="Nutrition Guidance" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N13 [label="Journaling for Wellness" color="#C0CA33" fillcolor="#F9FBE7" shape=folder style=filled]
+	N14 [label="Digital Detox" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N15 [label="Spiritual Exploration" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N16 [label="Nature Connection" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Community Wellness Programs" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Alternative Therapies" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+		nest0_1 [label="Work_Life Balance Coaching" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Positive Psychology Application" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Financial Wellness Planning" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest1_1 [label="Holistic Health Assessment" color="#B8C0F5" fillcolor="#ECF0FD" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=monitors color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=researches color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [label=promotes color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N15 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [label=motivates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M1 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_258.txt b/test/graphviz/graph_hard/graphviz_258.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3377b3aba08eb0b0a02265e03a4e41c397635aaf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_258.txt
@@ -0,0 +1,38 @@
+<Acupuncture Consultation, connectedTo, Aromatherapy Usage>
+<Acupuncture Consultation, connectedTo, Biofeedback Training>
+<Alternative Therapies, connectedTo, Work_Life Balance Coaching>
+<Alternative Therapies, partOf, Alternative Therapies>
+<Aromatherapy Usage, connectedTo, Behavior Change Support>
+<Aromatherapy Usage, connectedTo, Breathwork Exercises>
+<Aromatherapy Usage, connectedTo, Journaling for Wellness>
+<Aromatherapy Usage, connectedTo, Nature Connection>
+<Aromatherapy Usage, motivates, Biofeedback Training>
+<Behavior Change Support, connectedTo, Stress Management>
+<Biofeedback Training, connectedTo, Breathwork Exercises>
+<Breathwork Exercises, connectedTo, Employee Wellness Programs>
+<Breathwork Exercises, connectedTo, Meditation Coaching>
+<Breathwork Exercises, connectedTo, Nutrition Guidance>
+<Breathwork Exercises, connectedTo, Spiritual Exploration>
+<Detox Programs, connectedTo, Nutrition Guidance>
+<Digital Detox, connectedTo, Spiritual Exploration>
+<Employee Wellness Programs, connectedTo, Financial Wellness Planning>
+<Employee Wellness Programs, connectedTo, Meditation Coaching>
+<Employee Wellness Programs, connectedTo, Spiritual Exploration>
+<Financial Wellness Planning, connectedTo, Holistic Health Assessment>
+<Financial Wellness Planning, partOf, Financial Wellness Planning>
+<Gratitude Practice, connectedTo, Hydrotherapy>
+<Holistic Health Assessment, connectedTo, Spiritual Exploration>
+<Holistic Health Assessment, partOf, Holistic Health Assessment>
+<Hydrotherapy, connectedTo, Biofeedback Training>
+<Hydrotherapy, connectedTo, Breathwork Exercises>
+<Journaling for Wellness, connectedTo, Digital Detox>
+<Meditation Coaching, monitors, Detox Programs>
+<Nutrition Guidance, connectedTo, Spiritual Exploration>
+<Nutrition Guidance, researches, Journaling for Wellness>
+<Self_Care Routine Development, connectedTo, Acupuncture Consultation>
+<Spiritual Exploration, connectedTo, Nature Connection>
+<Stress Management, connectedTo, Biofeedback Training>
+<Stress Management, connectedTo, Gratitude Practice>
+<Stress Management, promotes, Alternative Therapies>
+<Work_Life Balance Coaching, connectedTo, Detox Programs>
+<Work_Life Balance Coaching, partOf, Work_Life Balance Coaching>
diff --git a/test/graphviz/graph_hard/graphviz_260.dot b/test/graphviz/graph_hard/graphviz_260.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dc57996d05ee756a3fc436cc03cd1c87e131031a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_260.dot
@@ -0,0 +1,75 @@
+digraph {
+	rankdir=TD
+	N0 [label="Lighting Design" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N1 [label="Ergonomics Integration" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N2 [label="Sustainable Design Practices" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N3 [label="Kitchen Design" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N4 [label="Universal Design Principles" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N5 [label="Residential Interior Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N6 [label="Living Room Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N7 [label="Bedroom Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N8 [label="Space Planning" color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+	N9 [label="CAD Drafting" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N10 [label="3D Rendering" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N11 [label="Office Space Design" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N12 [label="Concept Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=diamond style=filled]
+	N13 [label="Budget Management" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N14 [label="Textile and Fabric Selection" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N15 [label="Retail Interior Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Smart Home Technology Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Project Management" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest0_1 [label="Custom Furniture Design" color="#26A69A" fillcolor="#E0F2F1" shape=parallelogram style=filled]
+		nest0_2 [label="Site Measurement" color="#E57373" fillcolor="#FFEBEE" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Client Consultation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Art and Accessory Curation" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+		nest1_1 [label="Ventilation Planning" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+		nest1_2 [label="Commercial Interior Design" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest1_3 [label="Building Code Compliance" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label=sketches color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [label=furnishes color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N10 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [label=designs color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_260.txt b/test/graphviz/graph_hard/graphviz_260.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9fcf32c2fdc2e0b75c71704fc41f5bb65636f49f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_260.txt
@@ -0,0 +1,42 @@
+<3D Rendering, connectedTo, Office Space Design>
+<Art and Accessory Curation, connectedTo, Ventilation Planning>
+<Art and Accessory Curation, partOf, Art and Accessory Curation>
+<Bedroom Design, connectedTo, 3D Rendering>
+<Bedroom Design, connectedTo, Office Space Design>
+<Bedroom Design, connectedTo, Space Planning>
+<Bedroom Design, connectedTo, Textile and Fabric Selection>
+<Bedroom Design, designs, Retail Interior Design>
+<Budget Management, connectedTo, Textile and Fabric Selection>
+<Building Code Compliance, connectedTo, 3D Rendering>
+<Building Code Compliance, partOf, Building Code Compliance>
+<CAD Drafting, connectedTo, 3D Rendering>
+<Commercial Interior Design, connectedTo, Building Code Compliance>
+<Commercial Interior Design, partOf, Commercial Interior Design>
+<Concept Development, connectedTo, Budget Management>
+<Custom Furniture Design, connectedTo, Site Measurement>
+<Custom Furniture Design, partOf, Custom Furniture Design>
+<Ergonomics Integration, connectedTo, Residential Interior Design>
+<Ergonomics Integration, connectedTo, Sustainable Design Practices>
+<Kitchen Design, connectedTo, Residential Interior Design>
+<Kitchen Design, connectedTo, Universal Design Principles>
+<Lighting Design, connectedTo, Ergonomics Integration>
+<Lighting Design, connectedTo, Residential Interior Design>
+<Living Room Design, connectedTo, Bedroom Design>
+<Living Room Design, connectedTo, Project Management>
+<Office Space Design, connectedTo, Budget Management>
+<Office Space Design, connectedTo, Concept Development>
+<Office Space Design, connectedTo, Retail Interior Design>
+<Office Space Design, connectedTo, Textile and Fabric Selection>
+<Project Management, connectedTo, Custom Furniture Design>
+<Project Management, partOf, Project Management>
+<Residential Interior Design, connectedTo, Living Room Design>
+<Residential Interior Design, furnishes, Art and Accessory Curation>
+<Site Measurement, connectedTo, Retail Interior Design>
+<Site Measurement, partOf, Site Measurement>
+<Space Planning, connectedTo, CAD Drafting>
+<Sustainable Design Practices, connectedTo, Kitchen Design>
+<Sustainable Design Practices, connectedTo, Residential Interior Design>
+<Textile and Fabric Selection, connectedTo, Retail Interior Design>
+<Universal Design Principles, connectedTo, Residential Interior Design>
+<Ventilation Planning, partOf, Ventilation Planning>
+<Ventilation Planning, sketches, Commercial Interior Design>
diff --git a/test/graphviz/graph_hard/graphviz_261.dot b/test/graphviz/graph_hard/graphviz_261.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6d0b089d85fd678eba87dd13db3f2d7a7b5336b6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_261.dot
@@ -0,0 +1,57 @@
+digraph {
+	rankdir=TD
+	N0 [label="Concept Development" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N1 [label="Installation Supervision" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+	N2 [label="Budget Management" color="#607D8B" fillcolor="#CFD8DC" shape=plaintext style=filled]
+	N3 [label="Office Space Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N4 [label="Universal Design Principles" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N5 [label="Building Code Compliance" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N6 [label="Commercial Interior Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=plaintext style=filled]
+	N7 [label="Wall Treatment Selection" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N8 [label="3D Rendering" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N9 [label="Acoustic Treatment" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N10 [label="Smart Home Technology Integration" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Bedroom Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Bathroom Design" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_1 [label="Flooring Specification" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Project Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Mood Board Creation" color="#607D8B" fillcolor="#CFD8DC" shape=plaintext style=filled]
+		nest1_1 [label="Furniture Selection" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest1_2 [label="Post_Occupancy Evaluation" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_262.dot b/test/graphviz/graph_hard/graphviz_262.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9c8e0f0a5faa7c3e876f5dd9bd7e9e8fd161eada
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_262.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=RL
+	N0 [label="Customer Support Translation" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N1 [label="Tone Recognition" color="#3F51B5" fillcolor="#C5CAE9" shape=octagon style=filled]
+	N2 [label="Neural Machine Translation" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N3 [label="Data Security for Translated Content" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N4 [label="Cross_Lingual Communication" color="#00BCD4" fillcolor="#B2EBF2" shape=plaintext style=filled]
+	N5 [label="Social Media Translation" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N6 [label="Continuous Learning Models for Translation" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	S0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Meeting Translation Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Custom Vocabulary Integration" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_1 [label="Wearable Translation Devices" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+		nest0_2 [label="Speaker Diarization" color="#4DB6AC" fillcolor="#E0F2F1" shape=octagon style=filled]
+		nest0_3 [label="Real_Time Document Translation" color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="API Integration for Translation Services" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Consecutive Interpretation" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+		nest1_1 [label="Emotion Detection in Speech" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_2 [label="Subtitling Generation" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=captures color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_262.txt b/test/graphviz/graph_hard/graphviz_262.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0f6906975a3835569a4a603b39334030669cb50e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_262.txt
@@ -0,0 +1,30 @@
+<Consecutive Interpretation, connectedTo, Emotion Detection in Speech>
+<Consecutive Interpretation, partOf, Consecutive Interpretation>
+<Cross_Lingual Communication, connectedTo, Social Media Translation>
+<Custom Vocabulary Integration, connectedTo, Wearable Translation Devices>
+<Custom Vocabulary Integration, partOf, Custom Vocabulary Integration>
+<Customer Support Translation, connectedTo, Cross_Lingual Communication>
+<Customer Support Translation, connectedTo, Data Security for Translated Content>
+<Customer Support Translation, connectedTo, Neural Machine Translation>
+<Customer Support Translation, connectedTo, Social Media Translation>
+<Customer Support Translation, connectedTo, Tone Recognition>
+<Data Security for Translated Content, connectedTo, Consecutive Interpretation>
+<Data Security for Translated Content, connectedTo, Continuous Learning Models for Translation>
+<Data Security for Translated Content, connectedTo, Cross_Lingual Communication>
+<Data Security for Translated Content, connectedTo, Custom Vocabulary Integration>
+<Data Security for Translated Content, connectedTo, Social Media Translation>
+<Emotion Detection in Speech, connectedTo, Subtitling Generation>
+<Emotion Detection in Speech, partOf, Emotion Detection in Speech>
+<Neural Machine Translation, captures, Data Security for Translated Content>
+<Neural Machine Translation, connectedTo, Continuous Learning Models for Translation>
+<Real_Time Document Translation, connectedTo, Data Security for Translated Content>
+<Real_Time Document Translation, partOf, Real_Time Document Translation>
+<Social Media Translation, connectedTo, Continuous Learning Models for Translation>
+<Speaker Diarization, connectedTo, Real_Time Document Translation>
+<Speaker Diarization, partOf, Speaker Diarization>
+<Subtitling Generation, connectedTo, Continuous Learning Models for Translation>
+<Subtitling Generation, partOf, Subtitling Generation>
+<Tone Recognition, connectedTo, Data Security for Translated Content>
+<Tone Recognition, connectedTo, Neural Machine Translation>
+<Wearable Translation Devices, connectedTo, Speaker Diarization>
+<Wearable Translation Devices, partOf, Wearable Translation Devices>
diff --git a/test/graphviz/graph_hard/graphviz_263.txt b/test/graphviz/graph_hard/graphviz_263.txt
new file mode 100644
index 0000000000000000000000000000000000000000..338d1a7620a0b278d8942cf6fc7200c5f23e32e7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_263.txt
@@ -0,0 +1,32 @@
+<API Integration for Translation Services, automates, Meeting Translation Systems>
+<API Integration for Translation Services, partOf, API Integration for Translation Services>
+<Custom Vocabulary Integration, connectedTo, Low_Latency Processing>
+<Custom Vocabulary Integration, connectedTo, Real_Time Captioning>
+<Custom Vocabulary Integration, connectedTo, Statistical Machine Translation>
+<Custom Vocabulary Integration, connectedTo, Subtitling Generation>
+<Custom Vocabulary Integration, connectedTo, Voice Biometrics>
+<Dialect Recognition, connectedTo, Glossary Management>
+<Dialect Recognition, partOf, Dialect Recognition>
+<Glossary Management, connectedTo, Social Media Translation>
+<Glossary Management, partOf, Glossary Management>
+<Language Detection, connectedTo, Tone Recognition>
+<Language Detection, partOf, Language Detection>
+<Legal Document Translation, connectedTo, Text_to_Speech Synthesis>
+<Low_Latency Processing, connectedTo, Voice Biometrics>
+<Meeting Translation Systems, licenses, Language Detection>
+<Meeting Translation Systems, partOf, Meeting Translation Systems>
+<Real_Time Captioning, connectedTo, Subtitling Generation>
+<Real_Time Captioning, optimizes, API Integration for Translation Services>
+<Rule_Based Machine Translation, connectedTo, Legal Document Translation>
+<Rule_Based Machine Translation, connectedTo, Low_Latency Processing>
+<Social Media Translation, connectedTo, Subtitling Generation>
+<Social Media Translation, partOf, Social Media Translation>
+<Statistical Machine Translation, connectedTo, Dialect Recognition>
+<Statistical Machine Translation, connectedTo, Low_Latency Processing>
+<Text_to_Speech Synthesis, connectedTo, Custom Vocabulary Integration>
+<Text_to_Speech Synthesis, connectedTo, Low_Latency Processing>
+<Text_to_Speech Synthesis, connectedTo, Subtitling Generation>
+<Text_to_Speech Synthesis, integrates, Real_Time Captioning>
+<Tone Recognition, connectedTo, Subtitling Generation>
+<Tone Recognition, partOf, Tone Recognition>
+<Voice Biometrics, connectedTo, Real_Time Captioning>
diff --git a/test/graphviz/graph_hard/graphviz_264.txt b/test/graphviz/graph_hard/graphviz_264.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0606d89dda277f58ccd692b99343a2cf3a0bba42
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_264.txt
@@ -0,0 +1,41 @@
+<API Integration for Translation Services, connectedTo, Customer Support Translation>
+<API Integration for Translation Services, connectedTo, Statistical Machine Translation>
+<API Integration for Translation Services, converts, Machine Translation Engine>
+<Accent Adaptation, connectedTo, API Integration for Translation Services>
+<Accent Adaptation, connectedTo, Sentiment Analysis in Translation>
+<Customer Support Translation, connectedTo, Tone Recognition>
+<Dialect Recognition, connectedTo, Speaker Diarization>
+<Domain_Specific Translation Models, connectedTo, Customer Support Translation>
+<Domain_Specific Translation Models, partOf, Domain_Specific Translation Models>
+<Emotion Detection in Speech, connectedTo, Rule_Based Machine Translation>
+<Language Detection, connectedTo, Meeting Translation Systems>
+<Language Detection, partOf, Language Detection>
+<Legal Document Translation, connectedTo, Subtitling Generation>
+<Legal Document Translation, partOf, Legal Document Translation>
+<Low_Latency Processing, connectedTo, Sentiment Analysis in Translation>
+<Machine Translation Engine, captures, Noise Reduction for Speech Input>
+<Machine Translation Engine, connectedTo, Dialect Recognition>
+<Meeting Translation Systems, connectedTo, Emotion Detection in Speech>
+<Meeting Translation Systems, partOf, Meeting Translation Systems>
+<Noise Reduction for Speech Input, connectedTo, Customer Support Translation>
+<Noise Reduction for Speech Input, connectedTo, Dialect Recognition>
+<Noise Reduction for Speech Input, connectedTo, Emotion Detection in Speech>
+<Noise Reduction for Speech Input, connectedTo, Pronunciation Correction>
+<Noise Reduction for Speech Input, connectedTo, Tone Recognition>
+<Pronunciation Correction, connectedTo, Dialect Recognition>
+<Real_Time Document Translation, connectedTo, Accent Adaptation>
+<Sentiment Analysis in Translation, connectedTo, Customer Support Translation>
+<Sentiment Analysis in Translation, connectedTo, Legal Document Translation>
+<Speaker Diarization, connectedTo, Low_Latency Processing>
+<Speaker Diarization, connectedTo, Sentiment Analysis in Translation>
+<Speaker Diarization, connectedTo, Text_to_Speech Synthesis>
+<Speech Recognition, adapts, Sentiment Analysis in Translation>
+<Speech Recognition, connectedTo, Real_Time Document Translation>
+<Statistical Machine Translation, connectedTo, Dialect Recognition>
+<Statistical Machine Translation, connectedTo, Machine Translation Engine>
+<Subtitling Generation, partOf, Subtitling Generation>
+<Subtitling Generation, tracks, Domain_Specific Translation Models>
+<Text_to_Speech Synthesis, connectedTo, Language Detection>
+<Text_to_Speech Synthesis, partOf, Text_to_Speech Synthesis>
+<Tone Recognition, connectedTo, Voice Biometrics>
+<Voice Biometrics, connectedTo, Emotion Detection in Speech>
diff --git a/test/graphviz/graph_hard/graphviz_265.txt b/test/graphviz/graph_hard/graphviz_265.txt
new file mode 100644
index 0000000000000000000000000000000000000000..828326d1bca4df12a5eae1fc513a2a60ac4ae462
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_265.txt
@@ -0,0 +1,34 @@
+<3D Modeling from Drone Data, connectedTo, Aerial Photography>
+<3D Modeling from Drone Data, connectedTo, Battery Management System>
+<3D Modeling from Drone Data, connectedTo, Drone Delivery Logistics>
+<3D Modeling from Drone Data, connectedTo, Drone Maintenance>
+<3D Modeling from Drone Data, connectedTo, Flight Planning Software>
+<Autonomous Flight, connectedTo, Flight Planning Software>
+<Autonomous Flight, partOf, Autonomous Flight>
+<Battery Management System, connectedTo, Drone Regulations Compliance>
+<Communication Systems, connectedTo, 3D Modeling from Drone Data>
+<Communication Systems, connectedTo, Drone Maintenance>
+<Communication Systems, connectedTo, Flight Planning Software>
+<Counter_Drone Systems, connectedTo, Geofencing Implementation>
+<Counter_Drone Systems, partOf, Counter_Drone Systems>
+<Drone Delivery Logistics, connectedTo, Aerial Photography>
+<Drone Delivery Logistics, connectedTo, Counter_Drone Systems>
+<Drone Maintenance, connectedTo, Aerial Photography>
+<Drone Maintenance, connectedTo, Battery Management System>
+<Drone Maintenance, secures, Drone Regulations Compliance>
+<Drone Regulations Compliance, connectedTo, Drone Delivery Logistics>
+<Drone Regulations Compliance, connectedTo, Ethical Drone Use>
+<Ethical Drone Use, connectedTo, Ground Control Station Development>
+<Ethical Drone Use, partOf, Ethical Drone Use>
+<Flight Planning Software, connectedTo, Drone Maintenance>
+<Geofencing Implementation, connectedTo, Sensor Integration>
+<Geofencing Implementation, partOf, Geofencing Implementation>
+<Ground Control Station Development, connectedTo, Autonomous Flight>
+<Ground Control Station Development, partOf, Ground Control Station Development>
+<Sensor Integration, connectedTo, Flight Planning Software>
+<Sensor Integration, partOf, Sensor Integration>
+<Wildlife Tracking, connectedTo, 3D Modeling from Drone Data>
+<Wildlife Tracking, connectedTo, Aerial Photography>
+<Wildlife Tracking, connectedTo, Communication Systems>
+<Wildlife Tracking, connectedTo, Drone Maintenance>
+<Wildlife Tracking, connectedTo, Flight Planning Software>
diff --git a/test/graphviz/graph_hard/graphviz_269.dot b/test/graphviz/graph_hard/graphviz_269.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ced54ee7e6dc47efc2b5db98a9f352831e7d850e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_269.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=BT
+	N0 [label="Software Development" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Vehicle_to_Vehicle Communication" color="#7E57C2" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N2 [label="Accident Reconstruction for AVs" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N3 [label="Pedestrian Detection" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Map Data Management" color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+	N5 [label="Object Detection and Classification" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N6 [label="Cybersecurity for AVs" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N7 [label="Insurance Models for AVs" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Path Planning" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N9 [label="Battery Management for EVs" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N10 [label="Vehicle_to_Infrastructure Communication" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N11 [label="Over_the_Air Updates" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N12 [label="Fail_Safe Systems" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N13 [label="Ethical Decision_Making" color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+	N14 [label="Automatic Emergency Braking" color="#73C6BC" fillcolor="#D0EFEE" shape=Mdiamond style=filled]
+	N15 [label="Charging Infrastructure" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N16 [label="Cloud Connectivity for AVs" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	S0 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Lane Keeping Assist" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fleet Management" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_1 [label="Localization and Mapping" color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Traffic Sign Recognition" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Redundancy in Sensors" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+		nest1_1 [label="Vehicle Diagnostics" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_2 [label="Public Acceptance and Trust" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=operates color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=simulates color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=upgrades color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=regulates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N11 [label=maintains color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N12 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [label=updates color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [label=drives color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=learns color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N6 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_269.txt b/test/graphviz/graph_hard/graphviz_269.txt
new file mode 100644
index 0000000000000000000000000000000000000000..49dbe593605aea65f16ae34ceaba3bbb107feeae
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_269.txt
@@ -0,0 +1,47 @@
+<Accident Reconstruction for AVs, connectedTo, Path Planning>
+<Accident Reconstruction for AVs, connectedTo, Pedestrian Detection>
+<Accident Reconstruction for AVs, learns, Insurance Models for AVs>
+<Automatic Emergency Braking, connectedTo, Charging Infrastructure>
+<Battery Management for EVs, connectedTo, Vehicle_to_Infrastructure Communication>
+<Charging Infrastructure, connectedTo, Cloud Connectivity for AVs>
+<Cybersecurity for AVs, connectedTo, Battery Management for EVs>
+<Cybersecurity for AVs, connectedTo, Insurance Models for AVs>
+<Cybersecurity for AVs, connectedTo, Path Planning>
+<Ethical Decision_Making, connectedTo, Automatic Emergency Braking>
+<Fail_Safe Systems, connectedTo, Automatic Emergency Braking>
+<Fail_Safe Systems, connectedTo, Cloud Connectivity for AVs>
+<Fail_Safe Systems, connectedTo, Ethical Decision_Making>
+<Fail_Safe Systems, updates, Charging Infrastructure>
+<Fleet Management, connectedTo, Localization and Mapping>
+<Fleet Management, partOf, Fleet Management>
+<Insurance Models for AVs, connectedTo, Battery Management for EVs>
+<Insurance Models for AVs, connectedTo, Fleet Management>
+<Insurance Models for AVs, connectedTo, Path Planning>
+<Localization and Mapping, connectedTo, Pedestrian Detection>
+<Localization and Mapping, partOf, Localization and Mapping>
+<Map Data Management, connectedTo, Object Detection and Classification>
+<Map Data Management, connectedTo, Path Planning>
+<Object Detection and Classification, regulates, Cybersecurity for AVs>
+<Over_the_Air Updates, connectedTo, Charging Infrastructure>
+<Over_the_Air Updates, connectedTo, Cloud Connectivity for AVs>
+<Over_the_Air Updates, connectedTo, Ethical Decision_Making>
+<Over_the_Air Updates, connectedTo, Fail_Safe Systems>
+<Over_the_Air Updates, drives, Automatic Emergency Braking>
+<Path Planning, connectedTo, Battery Management for EVs>
+<Path Planning, connectedTo, Redundancy in Sensors>
+<Pedestrian Detection, connectedTo, Insurance Models for AVs>
+<Pedestrian Detection, connectedTo, Map Data Management>
+<Pedestrian Detection, connectedTo, Path Planning>
+<Public Acceptance and Trust, maintains, Over_the_Air Updates>
+<Public Acceptance and Trust, partOf, Public Acceptance and Trust>
+<Redundancy in Sensors, operates, Vehicle Diagnostics>
+<Redundancy in Sensors, partOf, Redundancy in Sensors>
+<Software Development, connectedTo, Insurance Models for AVs>
+<Software Development, upgrades, Vehicle_to_Vehicle Communication>
+<Vehicle Diagnostics, partOf, Vehicle Diagnostics>
+<Vehicle Diagnostics, simulates, Public Acceptance and Trust>
+<Vehicle_to_Infrastructure Communication, connectedTo, Over_the_Air Updates>
+<Vehicle_to_Vehicle Communication, connectedTo, Accident Reconstruction for AVs>
+<Vehicle_to_Vehicle Communication, connectedTo, Battery Management for EVs>
+<Vehicle_to_Vehicle Communication, connectedTo, Object Detection and Classification>
+<Vehicle_to_Vehicle Communication, connectedTo, Path Planning>
diff --git a/test/graphviz/graph_hard/graphviz_27.dot b/test/graphviz/graph_hard/graphviz_27.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b1b4f4df1933081d5d71f15dad8f55d0186672e8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_27.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=TD
+	N0 [label="Delay Notification" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Sorting Center" color="#D2D2D2" fillcolor="#F0F0F0" shape=octagon style=filled]
+	N2 [label=Consolidation color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N3 [label="Air Cargo Handling" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N4 [label="Warehouse Entry" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N5 [label="Container Loading" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+	N6 [label="Last_mile Dispatch" color="#D2D2D2" fillcolor="#F0F0F0" shape=oval style=filled]
+	N7 [label="Damage Reporting" color="#FFCC7A" fillcolor="#FFF6D9" shape=oval style=filled]
+	N8 [label="Driver Check_in" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N9 [label="Package Labeling" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N10 [label="Delivery Confirmation" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+	N11 [label="Pallet Stacking" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N12 [label="Cargo Tracking" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+	N13 [label=Cross_docking color="#FFCC7A" fillcolor="#FFF6D9" shape=octagon style=filled]
+	N14 [label="Order Picking" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N15 [label="Global Trade Compliance" color="#FFC085" fillcolor="#FFDAB9" shape=Mdiamond style=filled]
+	N16 [label="Supply Chain Visibility" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N17 [label="Return Logistics" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Customs Clearance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Hub Transfer" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+		nest0_1 [label="Demand Forecasting Integration" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+		nest0_2 [label="Carrier Selection" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest0_3 [label="Route Optimization Software" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Invoice Matching" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Yard Management" color="#FFC085" fillcolor="#FFDAB9" shape=Mdiamond style=filled]
+		nest1_1 [label="Ocean Freight Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N16 -> nest1_0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N17 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N10 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_27.txt b/test/graphviz/graph_hard/graphviz_27.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b9898e393fcd84a3abfbd4c047565a7edaa4efea
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_27.txt
@@ -0,0 +1,38 @@
+<Air Cargo Handling, connectedTo, Warehouse Entry>
+<Cargo Tracking, connectedTo, Cross_docking>
+<Carrier Selection, connectedTo, Route Optimization Software>
+<Carrier Selection, partOf, Carrier Selection>
+<Consolidation, connectedTo, Air Cargo Handling>
+<Consolidation, connectedTo, Delivery Confirmation>
+<Container Loading, connectedTo, Last_mile Dispatch>
+<Cross_docking, connectedTo, Order Picking>
+<Damage Reporting, connectedTo, Driver Check_in>
+<Delay Notification, connectedTo, Sorting Center>
+<Delivery Confirmation, connectedTo, Pallet Stacking>
+<Demand Forecasting Integration, connectedTo, Carrier Selection>
+<Demand Forecasting Integration, partOf, Demand Forecasting Integration>
+<Driver Check_in, connectedTo, Package Labeling>
+<Global Trade Compliance, connectedTo, Hub Transfer>
+<Global Trade Compliance, connectedTo, Supply Chain Visibility>
+<Hub Transfer, connectedTo, Demand Forecasting Integration>
+<Hub Transfer, partOf, Hub Transfer>
+<Last_mile Dispatch, connectedTo, Damage Reporting>
+<Last_mile Dispatch, connectedTo, Delivery Confirmation>
+<Last_mile Dispatch, connectedTo, Package Labeling>
+<Last_mile Dispatch, connectedTo, Pallet Stacking>
+<Ocean Freight Management, connectedTo, Return Logistics>
+<Ocean Freight Management, partOf, Ocean Freight Management>
+<Order Picking, connectedTo, Global Trade Compliance>
+<Package Labeling, connectedTo, Delivery Confirmation>
+<Pallet Stacking, connectedTo, Cargo Tracking>
+<Route Optimization Software, connectedTo, Driver Check_in>
+<Route Optimization Software, partOf, Route Optimization Software>
+<Sorting Center, connectedTo, Consolidation>
+<Sorting Center, connectedTo, Delivery Confirmation>
+<Sorting Center, connectedTo, Last_mile Dispatch>
+<Sorting Center, connectedTo, Pallet Stacking>
+<Supply Chain Visibility, connectedTo, Return Logistics>
+<Supply Chain Visibility, connectedTo, Yard Management>
+<Warehouse Entry, connectedTo, Container Loading>
+<Yard Management, connectedTo, Ocean Freight Management>
+<Yard Management, partOf, Yard Management>
diff --git a/test/graphviz/graph_hard/graphviz_270.dot b/test/graphviz/graph_hard/graphviz_270.dot
new file mode 100644
index 0000000000000000000000000000000000000000..90843325955a97d01b9f84ada5f079bbd4311625
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_270.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=BT
+	N0 [label="Public Acceptance and Trust" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N1 [label="Simulation and Testing" color="#E91E63" fillcolor="#FCE4EC" shape=plaintext style=filled]
+	N2 [label="Software Development" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N3 [label="Vehicle_to_Vehicle Communication" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N4 [label="Ethical Decision_Making" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N5 [label="Adaptive Cruise Control" color="#E91E63" fillcolor="#FCE4EC" shape=folder style=filled]
+	N6 [label="Over_the_Air Updates" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Localization and Mapping" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N8 [label="Vehicle_to_Infrastructure Communication" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	S0 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Object Detection and Classification" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Edge Computing for AVs" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+		nest0_1 [label="Regulatory Compliance" color="#D3EB9F" fillcolor="#F8FDD3" shape=Mdiamond style=filled]
+		nest0_2 [label="Traffic Sign Recognition" color="#E91E63" fillcolor="#FCE4EC" shape=plaintext style=filled]
+		nest0_3 [label="Driver Monitoring Systems" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Fail_Safe Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Lane Keeping Assist" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+		nest1_1 [label="Cybersecurity for AVs" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest1_2 [label="Redundancy in Sensors" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_270.txt b/test/graphviz/graph_hard/graphviz_270.txt
new file mode 100644
index 0000000000000000000000000000000000000000..534456b0e13b16b70205f5d71507ed838e506a7b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_270.txt
@@ -0,0 +1,31 @@
+<Adaptive Cruise Control, connectedTo, Over_the_Air Updates>
+<Cybersecurity for AVs, connectedTo, Redundancy in Sensors>
+<Cybersecurity for AVs, partOf, Cybersecurity for AVs>
+<Driver Monitoring Systems, connectedTo, Vehicle_to_Infrastructure Communication>
+<Driver Monitoring Systems, partOf, Driver Monitoring Systems>
+<Edge Computing for AVs, connectedTo, Regulatory Compliance>
+<Edge Computing for AVs, partOf, Edge Computing for AVs>
+<Ethical Decision_Making, connectedTo, Adaptive Cruise Control>
+<Ethical Decision_Making, connectedTo, Lane Keeping Assist>
+<Ethical Decision_Making, connectedTo, Localization and Mapping>
+<Ethical Decision_Making, connectedTo, Over_the_Air Updates>
+<Ethical Decision_Making, connectedTo, Vehicle_to_Infrastructure Communication>
+<Lane Keeping Assist, connectedTo, Cybersecurity for AVs>
+<Lane Keeping Assist, partOf, Lane Keeping Assist>
+<Localization and Mapping, connectedTo, Vehicle_to_Infrastructure Communication>
+<Over_the_Air Updates, connectedTo, Edge Computing for AVs>
+<Over_the_Air Updates, connectedTo, Localization and Mapping>
+<Public Acceptance and Trust, connectedTo, Simulation and Testing>
+<Redundancy in Sensors, connectedTo, Adaptive Cruise Control>
+<Redundancy in Sensors, partOf, Redundancy in Sensors>
+<Regulatory Compliance, connectedTo, Traffic Sign Recognition>
+<Regulatory Compliance, partOf, Regulatory Compliance>
+<Simulation and Testing, connectedTo, Software Development>
+<Software Development, connectedTo, Localization and Mapping>
+<Software Development, connectedTo, Vehicle_to_Vehicle Communication>
+<Traffic Sign Recognition, connectedTo, Driver Monitoring Systems>
+<Traffic Sign Recognition, partOf, Traffic Sign Recognition>
+<Vehicle_to_Vehicle Communication, connectedTo, Adaptive Cruise Control>
+<Vehicle_to_Vehicle Communication, connectedTo, Ethical Decision_Making>
+<Vehicle_to_Vehicle Communication, connectedTo, Localization and Mapping>
+<Vehicle_to_Vehicle Communication, connectedTo, Vehicle_to_Infrastructure Communication>
diff --git a/test/graphviz/graph_hard/graphviz_274.txt b/test/graphviz/graph_hard/graphviz_274.txt
new file mode 100644
index 0000000000000000000000000000000000000000..68c5fc3dcc83ea195f1d1b542ac50e73c446685e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_274.txt
@@ -0,0 +1,45 @@
+<Access Control Systems, connectedTo, Ticketing System Integration>
+<Automated Parking Garages, connectedTo, Event Parking Management>
+<Automated Parking Garages, partOf, Automated Parking Garages>
+<Billing and Reconciliation, connectedTo, Edge Computing for Parking Data>
+<Billing and Reconciliation, partOf, Billing and Reconciliation>
+<Cloud_based Parking Platforms, connectedTo, Demand Forecasting>
+<Demand Forecasting, connectedTo, Dynamic Pricing>
+<Dynamic Pricing, connectedTo, Integration with Navigation Apps>
+<Edge Computing for Parking Data, connectedTo, Cloud_based Parking Platforms>
+<Edge Computing for Parking Data, partOf, Edge Computing for Parking Data>
+<Electric Vehicle Charging Integration, connectedTo, On_Street Parking Management>
+<Enforcement and Fines Management, connectedTo, IoT Sensors for Parking>
+<Event Parking Management, connectedTo, Valet Parking Automation>
+<Event Parking Management, partOf, Event Parking Management>
+<Integration with Navigation Apps, connectedTo, Navigation to Open Space>
+<IoT Sensors for Parking, connectedTo, Dynamic Pricing>
+<IoT Sensors for Parking, connectedTo, On_Street Parking Management>
+<IoT Sensors for Parking, connectedTo, Smart City Integration for Parking>
+<IoT Sensors for Parking, connectedTo, Ticketing System Integration>
+<IoT Sensors for Parking, connectedTo, Violation Detection>
+<License Plate Recognition, connectedTo, Demand Forecasting>
+<License Plate Recognition, connectedTo, On_Street Parking Management>
+<License Plate Recognition, connectedTo, Reservations System>
+<License Plate Recognition, connectedTo, Ticketing System Integration>
+<License Plate Recognition, identifies, Space Detection>
+<On_Street Parking Management, connectedTo, Cloud_based Parking Platforms>
+<On_Street Parking Management, connectedTo, Demand Forecasting>
+<On_Street Parking Management, connectedTo, Navigation to Open Space>
+<On_Street Parking Management, connectedTo, Space Detection>
+<On_Street Parking Management, connectedTo, Violation Detection>
+<Parking Guidance Systems, connectedTo, Automated Parking Garages>
+<Parking Guidance Systems, partOf, Parking Guidance Systems>
+<Permit Management, connectedTo, License Plate Recognition>
+<Permit Management, connectedTo, Ticketing System Integration>
+<Reservations System, connectedTo, Enforcement and Fines Management>
+<Reservations System, connectedTo, Parking Guidance Systems>
+<Reservations System, connectedTo, Ticketing System Integration>
+<Smart City Integration for Parking, connectedTo, Access Control Systems>
+<Space Detection, connectedTo, Cloud_based Parking Platforms>
+<Ticketing System Integration, connectedTo, Electric Vehicle Charging Integration>
+<Ticketing System Integration, installs, Violation Detection>
+<Ticketing System Integration, reserves, Billing and Reconciliation>
+<Valet Parking Automation, integrates, Reservations System>
+<Valet Parking Automation, partOf, Valet Parking Automation>
+<Violation Detection, connectedTo, Space Detection>
diff --git a/test/graphviz/graph_hard/graphviz_275.dot b/test/graphviz/graph_hard/graphviz_275.dot
new file mode 100644
index 0000000000000000000000000000000000000000..32c49b98d4b8b1fa630428f6f4bc75cb58c36eaf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_275.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=BT
+	N0 [label="Customer Support" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Revenue Management" color="#FFF176" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N2 [label="Maintenance of Systems" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N3 [label="Navigation to Open Space" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N4 [label="Environmental Impact Monitoring" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Automated Parking Garages" color="#FFF176" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N6 [label="Emergency Vehicle Access Management" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N7 [label="Off_Street Parking Management" color="#FFF176" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N8 [label="Vacancy Monitoring" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N9 [label="Automated Payment" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N10 [label="Barrier Gate Control" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N11 [label="Billing and Reconciliation" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N12 [label="Data Analytics for Parking Usage" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N13 [label="Mobile Parking Apps" color="#FFE470" fillcolor="#FFFAE0" shape=Mdiamond style=filled]
+	N14 [label="Permit Management" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N15 [label="Ticketing System Integration" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N16 [label="Fleet Parking Solutions" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N17 [label="Edge Computing for Parking Data" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N18 [label="Enforcement and Fines Management" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	S0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="License Plate Recognition" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Access Control Systems" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_1 [label="Violation Detection" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Smart City Integration for Parking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Demand Forecasting" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_1 [label="Cloud_based Parking Platforms" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest1_2 [label="IoT Sensors for Parking" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+		nest1_3 [label="User Experience Design for Apps" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=identifies color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N17 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest1_0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [label=repairs color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N12 -> S1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [label=develops color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_278.txt b/test/graphviz/graph_hard/graphviz_278.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b7b4a7aabf968061eaaa34fb7c5eb04a28ea4489
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_278.txt
@@ -0,0 +1,42 @@
+<API Integration for Partners, connectedTo, Audience Segmentation>
+<API Integration for Partners, connectedTo, Ticket Sales>
+<API Integration for Partners, personalizes, Post_Event Feedback Collection>
+<Access Control, connectedTo, Theme Park Ticketing>
+<Access Control, partOf, Access Control>
+<Agent Network Management, connectedTo, Fraud Prevention>
+<Audience Segmentation, connectedTo, Concert Ticketing>
+<Audience Segmentation, connectedTo, Group Booking Management>
+<Audience Segmentation, connectedTo, Personalized Ticket Offers>
+<Audience Segmentation, payments, Festival Ticketing>
+<Concert Ticketing, connectedTo, Seat Mapping>
+<Customer Relationship Management Integration, connectedTo, Dynamic Pricing>
+<Dynamic Pricing, connectedTo, Group Booking Management>
+<Event Creation, connectedTo, Venue Capacity Management>
+<Event Creation, partOf, Event Creation>
+<Fan Loyalty Programs, connectedTo, Public Transport Ticketing>
+<Fan Loyalty Programs, partOf, Fan Loyalty Programs>
+<Festival Ticketing, connectedTo, Queue Management>
+<Fraud Prevention, connectedTo, Festival Ticketing>
+<Group Booking Management, connectedTo, Post_Event Feedback Collection>
+<Payment Processing, connectedTo, Access Control>
+<Payment Processing, partOf, Payment Processing>
+<Personalized Ticket Offers, connectedTo, Payment Processing>
+<Personalized Ticket Offers, partOf, Personalized Ticket Offers>
+<Post_Event Feedback Collection, connects, Scalper Prevention>
+<Public Transport Ticketing, connectedTo, Agent Network Management>
+<Queue Management, responds, Customer Relationship Management Integration>
+<Refund Management, connectedTo, API Integration for Partners>
+<Scalper Prevention, publishes, Waiting List Management>
+<Seat Mapping, connectedTo, Analytics on Sales Data>
+<Seat Mapping, connectedTo, Dynamic Pricing>
+<Seat Mapping, connectedTo, Festival Ticketing>
+<Seat Mapping, connectedTo, Public Transport Ticketing>
+<Seat Mapping, validates, Waiting List Management>
+<Theme Park Ticketing, connectedTo, Agent Network Management>
+<Theme Park Ticketing, connectedTo, Audience Segmentation>
+<Ticket Sales, connectedTo, Agent Network Management>
+<Ticket Sales, connectedTo, Theme Park Ticketing>
+<Venue Capacity Management, connectedTo, Fan Loyalty Programs>
+<Venue Capacity Management, partOf, Venue Capacity Management>
+<Waiting List Management, connectedTo, Analytics on Sales Data>
+<Waiting List Management, connectedTo, Event Creation>
diff --git a/test/graphviz/graph_hard/graphviz_279.dot b/test/graphviz/graph_hard/graphviz_279.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3c92f284a21293ae1c416d051ec2c4ca3d601f72
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_279.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="API Integration for Partners" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Concert Ticketing" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N2 [label="Sports Event Ticketing" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N3 [label="Public Transport Ticketing" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N4 [label="Mobile Ticketing" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N5 [label="Theater Ticketing" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N6 [label="Promotional Code Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=plaintext style=filled]
+	N7 [label="Waiting List Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N8 [label="Ticket Sales" color="#6FE1D5" fillcolor="#C9EFEC" shape=parallelogram style=filled]
+	N9 [label="Pricing Configuration" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N10 [label="Agent Network Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N11 [label="Ticket Delivery" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N12 [label="Blockchain Ticketing for Authenticity" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N13 [label="Theme Park Ticketing" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N14 [label="Refund Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N15 [label="Dynamic Pricing" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Museum Ticketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Resale Market Integration" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest0_1 [label="Order Confirmation" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+		nest0_2 [label="Personalized Ticket Offers" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Box Office Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Scalper Prevention" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest1_1 [label="Group Booking Management" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+		nest1_2 [label="Event Creation" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest0_0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N9 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N15 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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diff --git a/test/graphviz/graph_hard/graphviz_280.dot b/test/graphviz/graph_hard/graphviz_280.dot
new file mode 100644
index 0000000000000000000000000000000000000000..735c83ee16e3b5e66de1bcdeacd364380ca5efc0
--- /dev/null
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diff --git a/test/graphviz/graph_hard/graphviz_281.dot b/test/graphviz/graph_hard/graphviz_281.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3d4b14b6a0ba34152518bfee58c10763d664c534
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_281.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=BT
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+	N1 [label="Public Trust Building" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
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diff --git a/test/graphviz/graph_hard/graphviz_282.txt b/test/graphviz/graph_hard/graphviz_282.txt
new file mode 100644
index 0000000000000000000000000000000000000000..db43d12a1b844533b4a7ac45dda0be3ba53b6226
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_282.txt
@@ -0,0 +1,34 @@
+<Accessibility Features, connectedTo, Cryptographic Security>
+<Accessibility Features, connectedTo, System Certification>
+<Auditability, connectedTo, Voter Registration>
+<Auditability, partOf, Auditability>
+<Blockchain for Voting, connectedTo, Hardware Tamper Detection>
+<Cryptographic Security, connectedTo, Election Official Training>
+<Cryptographic Security, connectedTo, Voter Authentication>
+<Election Official Training, connectedTo, Touchscreen Voting Machines>
+<Hardware Tamper Detection, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Legal Framework Compliance, connectedTo, Blockchain for Voting>
+<Penetration Testing, connectedTo, Post_Election Audits>
+<Penetration Testing, partOf, Penetration Testing>
+<Post_Election Audits, connectedTo, System Certification>
+<Results Aggregation, connectedTo, Legal Framework Compliance>
+<Results Aggregation, partOf, Results Aggregation>
+<Software Integrity Checks, connectedTo, Auditability>
+<Software Integrity Checks, develops, Legal Framework Compliance>
+<System Certification, monitors, Software Integrity Checks>
+<Touchscreen Voting Machines, connectedTo, System Certification>
+<Touchscreen Voting Machines, connectedTo, Vote Counting>
+<Touchscreen Voting Machines, recovers, Blockchain for Voting>
+<Touchscreen Voting Machines, resists, System Certification>
+<Vote Counting, connectedTo, Hardware Tamper Detection>
+<Vote Counting, connectedTo, Legal Framework Compliance>
+<Vote Counting, connectedTo, System Certification>
+<Vote Counting, transmits, Blockchain for Voting>
+<Vote Counting, validates, Post_Election Audits>
+<Voter Authentication, connectedTo, Penetration Testing>
+<Voter Authentication, partOf, Voter Authentication>
+<Voter Education Programs, connectedTo, Results Aggregation>
+<Voter Education Programs, partOf, Voter Education Programs>
+<Voter Registration, connectedTo, Voter Education Programs>
+<Voter Registration, partOf, Voter Registration>
+<Zero_Knowledge Proofs for Privacy, connectedTo, Public Trust Building>
diff --git a/test/graphviz/graph_hard/graphviz_283.txt b/test/graphviz/graph_hard/graphviz_283.txt
new file mode 100644
index 0000000000000000000000000000000000000000..43feecb91e77cdec03437b23c8093972c045e7d9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_283.txt
@@ -0,0 +1,35 @@
+<Behavioral Economics in Policy, connectedTo, Forecasting and Scenario Planning>
+<Behavioral Economics in Policy, partOf, Behavioral Economics in Policy>
+<Ethical Considerations, connectedTo, International Policy Analysis>
+<Ethical Considerations, connectedTo, Recommendation Formulation>
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+<Impact Assessment, connectedTo, Report Drafting>
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+<Implementation Plan Development, partOf, Implementation Plan Development>
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+<Policy Learning, connectedTo, Evidence_Based Policymaking>
+<Policy Learning, connectedTo, International Policy Analysis>
+<Policy Learning, connectedTo, Recommendation Formulation>
+<Policy Simulation Models, connectedTo, Implementation Plan Development>
+<Policy Simulation Models, partOf, Policy Simulation Models>
+<Presentation Skills, connectedTo, International Policy Analysis>
+<Presentation Skills, connectedTo, Policy Learning>
+<Presentation Skills, connectedTo, Problem Identification>
+<Problem Identification, connectedTo, Policy Learning>
+<Public Opinion Research, connectedTo, Policy Simulation Models>
+<Public Opinion Research, partOf, Public Opinion Research>
+<Quantitative Analysis, connectedTo, Policy Learning>
+<Quantitative Analysis, connectedTo, Presentation Skills>
+<Recommendation Formulation, consults, Forecasting and Scenario Planning>
+<Regulatory Impact Assessment, connectedTo, Forecasting and Scenario Planning>
+<Regulatory Impact Assessment, connectedTo, Recommendation Formulation>
+<Regulatory Impact Assessment, connectedTo, Risk Assessment>
+<Report Drafting, connectedTo, International Policy Analysis>
+<Report Drafting, partOf, Report Drafting>
diff --git a/test/graphviz/graph_hard/graphviz_285.txt b/test/graphviz/graph_hard/graphviz_285.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8f644e53101423d3c6cb1664c20cdcffd86c4f6a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_285.txt
@@ -0,0 +1,41 @@
+<Advocacy Strategy, connectedTo, Problem Identification>
+<Advocacy Strategy, partOf, Advocacy Strategy>
+<Behavioral Economics in Policy, audits, Policy Simulation Models>
+<Behavioral Economics in Policy, connectedTo, Option Generation>
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+<Ethical Considerations, connectedTo, Behavioral Economics in Policy>
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+<Legal Review, connectedTo, Ethical Considerations>
+<Legal Review, connectedTo, National Policy Development>
+<Legal Review, connectedTo, Policy Evaluation>
+<Monitoring and Evaluation Framework, connectedTo, Political Feasibility Assessment>
+<Monitoring and Evaluation Framework, partOf, Monitoring and Evaluation Framework>
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+<National Policy Development, connectedTo, Interagency Coordination>
+<National Policy Development, connectedTo, Policy Evaluation>
+<National Policy Development, connectedTo, Quantitative Analysis>
+<Non_profit Policy Influence, connectedTo, Presentation Skills>
+<Non_profit Policy Influence, partOf, Non_profit Policy Influence>
+<Option Generation, connectedTo, Monitoring and Evaluation Framework>
+<Option Generation, partOf, Option Generation>
+<Policy Advocacy and Lobbying, connectedTo, Non_profit Policy Influence>
+<Policy Advocacy and Lobbying, partOf, Policy Advocacy and Lobbying>
+<Policy Evaluation, connectedTo, Policy Simulation Models>
+<Policy Evaluation, connectedTo, Problem Identification>
+<Political Feasibility Assessment, connectedTo, Advocacy Strategy>
+<Political Feasibility Assessment, partOf, Political Feasibility Assessment>
+<Presentation Skills, connectedTo, Policy Simulation Models>
+<Presentation Skills, partOf, Presentation Skills>
+<Problem Identification, connectedTo, Policy Simulation Models>
+<Problem Identification, models, Criteria Establishment>
+<Qualitative Analysis, connectedTo, Policy Evaluation>
+<Qualitative Analysis, connectedTo, Policy Simulation Models>
+<Qualitative Analysis, connectedTo, Report Drafting>
+<Quantitative Analysis, connectedTo, Policy Advocacy and Lobbying>
+<Quantitative Analysis, partOf, Quantitative Analysis>
+<Report Drafting, connectedTo, Policy Evaluation>
+<Report Drafting, consults, Legal Review>
diff --git a/test/graphviz/graph_hard/graphviz_287.dot b/test/graphviz/graph_hard/graphviz_287.dot
new file mode 100644
index 0000000000000000000000000000000000000000..eb3052dae45b9a5bd6b6a20af6656d6bf74ee522
--- /dev/null
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+		nest0_2 [label="Experiment Design" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Research Ethics Application" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Open Science Practices" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest1_1 [label="Manuscript Writing" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=researches color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N9 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [label="data management" color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [label=assesses color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [label=innovates color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [label=interprets color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_288.txt b/test/graphviz/graph_hard/graphviz_288.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1133d6626d46addb3d77e141e4e2e6c36f9b43e4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_288.txt
@@ -0,0 +1,37 @@
+<Academic Mentorship, connectedTo, Hypothesis Formulation>
+<Academic Mentorship, connectedTo, Literature Review>
+<Academic Mentorship, connectedTo, Open Science Practices>
+<Academic Mentorship, connectedTo, Plagiarism Detection>
+<Academic Mentorship, connectedTo, Systematic Review>
+<Data Analysis, connectedTo, Research Design>
+<Experiment Design, connectedTo, Academic Mentorship>
+<Experiment Design, connectedTo, Meta_Analysis>
+<Funding Agency Reporting, connectedTo, Data Analysis>
+<Grant Proposal Writing, connectedTo, Power Analysis>
+<Grant Proposal Writing, partOf, Grant Proposal Writing>
+<Hypothesis Formulation, connectedTo, Systematic Review>
+<Intellectual Property in Research, connectedTo, Academic Mentorship>
+<Literature Review, connectedTo, Plagiarism Detection>
+<Meta_Analysis, connectedTo, Poster Session Preparation>
+<Open Science Practices, connectedTo, Survey Design>
+<Open Science Practices, partOf, Open Science Practices>
+<Peer Review Process, connectedTo, Thesis or Dissertation Writing>
+<Peer Review Process, partOf, Peer Review Process>
+<Plagiarism Detection, connectedTo, Hypothesis Formulation>
+<Poster Session Preparation, collaborates, Power Analysis>
+<Poster Session Preparation, connectedTo, Plagiarism Detection>
+<Poster Session Preparation, connectedTo, Systematic Review>
+<Poster Session Preparation, researches, Hypothesis Formulation>
+<Power Analysis, connectedTo, Funding Agency Reporting>
+<Research Design, connectedTo, Academic Mentorship>
+<Research Design, connectedTo, Systematic Review>
+<Research Design, connectedTo, Thesis or Dissertation Writing>
+<Sampling Techniques, connectedTo, Theory Development>
+<Sampling Techniques, partOf, Sampling Techniques>
+<Survey Design, innovates, Grant Proposal Writing>
+<Survey Design, partOf, Survey Design>
+<Theory Development, connectedTo, Peer Review Process>
+<Theory Development, partOf, Theory Development>
+<Thesis or Dissertation Writing, connectedTo, Intellectual Property in Research>
+<Thesis or Dissertation Writing, connectedTo, Sampling Techniques>
+<Thesis or Dissertation Writing, connectedTo, Systematic Review>
diff --git a/test/graphviz/graph_hard/graphviz_289.dot b/test/graphviz/graph_hard/graphviz_289.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e292f1320437f9fe7c687c2c8c1776b5f46140fa
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_289.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=LR
+	N0 [label="Electronic Resource Management" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Subject Indexing" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N2 [label="Search Functionality" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N3 [label="User Training on Systems" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N4 [label="Cataloging and Classification" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N5 [label="Mobile App for Library" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N6 [label=Acquisitions color="#F44336" fillcolor="#FFCDD2" shape=folder style=filled]
+	N7 [label="Archival Integration" color="#A2D0FF" fillcolor="#E8F0FF" shape=folder style=filled]
+	N8 [label="Metadata Creation" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N9 [label="Resource Sharing Networks" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N10 [label="User Account Management" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N11 [label="Interlibrary Loan" color="#A2D0FF" fillcolor="#E8F0FF" shape=folder style=filled]
+	N12 [label="Integrated Library Systems" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N13 [label="Personalized Recommendations" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	N14 [label="Database Management" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N15 [label="Preservation of Materials" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N16 [label="RFID System Implementation" color="#A2D0FF" fillcolor="#E8F0FF" shape=plaintext style=filled]
+	N17 [label="Self_Checkout Kiosks" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	N18 [label="Digitization Projects" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N19 [label="System Security" color="#F44336" fillcolor="#FFCDD2" shape=plaintext style=filled]
+	N20 [label="Digital Resource Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Open Access Repository Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Discovery Layers" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+		nest0_1 [label="Library Management Systems" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Circulation Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Library Website Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+		nest1_1 [label="Linked Data for Libraries" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=implements color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [label=assists color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N19 -> N20 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N17 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest1_0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N19 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N16 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N20 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N19 [label=reports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [label=reserves color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [label=digitizes color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	M1 -> N20 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	M2 -> N18 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_29.dot b/test/graphviz/graph_hard/graphviz_29.dot
new file mode 100644
index 0000000000000000000000000000000000000000..68d8099f4b95142144c025165187c939b4b14ce7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_29.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=RL
+	N0 [label="Broadband Provisioning" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Plan Suspension" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N2 [label="Bandwidth Allocation" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N3 [label="Service Complaint" color="#D2D2D2" fillcolor="#F0F0F0" shape=folder style=filled]
+	N4 [label="Video Conferencing" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N5 [label="Network Upgrade" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N6 [label="Bill Generation" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+	N7 [label="Contract Termination" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N8 [label="Service Level Agreement" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N9 [label="Outage Detection" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N10 [label="Service Activation Request" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N11 [label="Mobile Top_up" color="#D2D2D2" fillcolor="#F0F0F0" shape=folder style=filled]
+	N12 [label="Fiber Optic Deployment" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N13 [label="SIM Registration" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Antenna Maintenance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="SMS Delivery" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+		nest0_1 [label="Customer Relationship Management" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest0_2 [label="Fraudulent Call Blocking" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest0_3 [label="Roaming Activation" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Plan Renewal" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Base Station Installation" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+		nest1_1 [label="Spectrum Management" color="#03A9F4" fillcolor="#B3E5FC" shape=folder style=filled]
+		nest1_2 [label="Plan Selection" color="#03A9F4" fillcolor="#B3E5FC" shape=folder style=filled]
+		nest1_3 [label="Speed Throttling" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N10 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S2 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_29.txt b/test/graphviz/graph_hard/graphviz_29.txt
new file mode 100644
index 0000000000000000000000000000000000000000..43f8fb38b661927565b2073548ebaa7aef273fe5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_29.txt
@@ -0,0 +1,38 @@
+<Bandwidth Allocation, connectedTo, Service Complaint>
+<Base Station Installation, connectedTo, Spectrum Management>
+<Base Station Installation, partOf, Base Station Installation>
+<Bill Generation, connectedTo, Contract Termination>
+<Bill Generation, connectedTo, Service Activation Request>
+<Bill Generation, connectedTo, Service Level Agreement>
+<Broadband Provisioning, connectedTo, Bandwidth Allocation>
+<Broadband Provisioning, connectedTo, Fiber Optic Deployment>
+<Broadband Provisioning, connectedTo, Mobile Top_up>
+<Broadband Provisioning, connectedTo, Plan Suspension>
+<Broadband Provisioning, connectedTo, Service Complaint>
+<Contract Termination, connectedTo, Service Level Agreement>
+<Customer Relationship Management, connectedTo, Fraudulent Call Blocking>
+<Customer Relationship Management, partOf, Customer Relationship Management>
+<Fiber Optic Deployment, connectedTo, SIM Registration>
+<Fraudulent Call Blocking, connectedTo, Roaming Activation>
+<Fraudulent Call Blocking, partOf, Fraudulent Call Blocking>
+<Mobile Top_up, connectedTo, Fiber Optic Deployment>
+<Network Upgrade, connectedTo, Bill Generation>
+<Outage Detection, connectedTo, Service Activation Request>
+<Plan Selection, connectedTo, Speed Throttling>
+<Plan Selection, partOf, Plan Selection>
+<Plan Suspension, connectedTo, Bandwidth Allocation>
+<Plan Suspension, connectedTo, Base Station Installation>
+<Plan Suspension, connectedTo, Service Complaint>
+<Roaming Activation, connectedTo, Bandwidth Allocation>
+<Roaming Activation, partOf, Roaming Activation>
+<SMS Delivery, connectedTo, Customer Relationship Management>
+<SMS Delivery, partOf, SMS Delivery>
+<Service Activation Request, connectedTo, Mobile Top_up>
+<Service Activation Request, connectedTo, SMS Delivery>
+<Service Complaint, connectedTo, Video Conferencing>
+<Service Level Agreement, connectedTo, Outage Detection>
+<Spectrum Management, connectedTo, Plan Selection>
+<Spectrum Management, partOf, Spectrum Management>
+<Speed Throttling, connectedTo, Service Activation Request>
+<Speed Throttling, partOf, Speed Throttling>
+<Video Conferencing, connectedTo, Network Upgrade>
diff --git a/test/graphviz/graph_hard/graphviz_290.txt b/test/graphviz/graph_hard/graphviz_290.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c17d7b0e453201fd4f3fb6b5343daa2e9a5be190
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_290.txt
@@ -0,0 +1,30 @@
+<Acquisitions, connectedTo, Preservation of Materials>
+<Acquisitions, connectedTo, Reporting and Analytics>
+<Acquisitions, connectedTo, Subject Indexing>
+<Data Migration, connectedTo, Digital Resource Management>
+<Digital Resource Management, connectedTo, Personalized Recommendations>
+<Discovery Layers, connectedTo, Circulation Management>
+<Federated Search, connectedTo, Digital Resource Management>
+<Federated Search, partOf, Federated Search>
+<Library Website Management, accesses, Self_Checkout Kiosks>
+<Library Website Management, partOf, Library Website Management>
+<Open Access Repository Management, connectedTo, Data Migration>
+<Open Access Repository Management, connectedTo, Personalized Recommendations>
+<Open Access Repository Management, indexes, Digital Resource Management>
+<Personalized Recommendations, connectedTo, Discovery Layers>
+<Personalized Recommendations, connectedTo, System Security>
+<Preservation of Materials, connectedTo, Library Website Management>
+<Preservation of Materials, partOf, Preservation of Materials>
+<Reporting and Analytics, connectedTo, Open Access Repository Management>
+<Self_Checkout Kiosks, connectedTo, Personalized Recommendations>
+<Self_Checkout Kiosks, partOf, Self_Checkout Kiosks>
+<Serials Control, connectedTo, Open Access Repository Management>
+<Serials Control, connectedTo, Personalized Recommendations>
+<Serials Control, connectedTo, Subject Indexing>
+<Serials Control, connectedTo, Technical Support for Systems>
+<Serials Control, migrates, Reporting and Analytics>
+<Subject Indexing, connectedTo, Reporting and Analytics>
+<System Security, displays, Federated Search>
+<System Security, partOf, System Security>
+<Technical Support for Systems, connectedTo, Subject Indexing>
+<Technical Support for Systems, trains, Acquisitions>
diff --git a/test/graphviz/graph_hard/graphviz_291.dot b/test/graphviz/graph_hard/graphviz_291.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3634114b8f9a5ec5277d800db1455ef7d5f50c8f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_291.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=LR
+	N0 [label="Federated Search" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Interlibrary Loan" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N2 [label="Library Management Systems" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N3 [label="AI in Library Services" color="#03A9F4" fillcolor="#B3E5FC" shape=hexagon style=filled]
+	N4 [label="Discovery Layers" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N5 [label="System Upgrades" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N6 [label="Technical Support for Systems" color="#90A4AE" fillcolor="#ECEFF1" shape=oval style=filled]
+	N7 [label="Automated Materials Handling" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N8 [label="Self_Checkout Kiosks" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N9 [label="Database Management" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N10 [label="Digital Resource Management" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N11 [label="Data Migration" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="User Training on Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Search Functionality" color="#03A9F4" fillcolor="#B3E5FC" shape=oval style=filled]
+		nest0_1 [label="Archival Integration" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+		nest0_2 [label="System Security" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Resource Sharing Networks" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Authority Control" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest1_1 [label="Personalized Recommendations" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=integrates color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=migrates color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=digitizes color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=reports color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N10 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S2 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=develops color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_292.txt b/test/graphviz/graph_hard/graphviz_292.txt
new file mode 100644
index 0000000000000000000000000000000000000000..41917f1be56271ab4163ca74172195953b9ccd14
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_292.txt
@@ -0,0 +1,34 @@
+<Access and Reference Services, connectedTo, Appraisal and Selection>
+<Acquisition and Accessioning, connectedTo, Access and Reference Services>
+<Acquisition and Accessioning, connectedTo, Appraisal and Selection>
+<Acquisition and Accessioning, connectedTo, Conservation Treatment>
+<Acquisition and Accessioning, connectedTo, Database Management>
+<Acquisition and Accessioning, connectedTo, Digitization of Records>
+<Acquisition and Accessioning, connectedTo, Disaster Preparedness for Archives>
+<Appraisal and Selection, connectedTo, Born_Digital Archiving>
+<Appraisal and Selection, connectedTo, Metadata Creation>
+<Authority Control for Archival Names, connectedTo, Legal and Ethical Compliance>
+<Authority Control for Archival Names, partOf, Authority Control for Archival Names>
+<Conservation Treatment, connectedTo, Born_Digital Archiving>
+<Conservation Treatment, connectedTo, Database Management>
+<Database Management, connectedTo, Ethical Use of Archival Materials>
+<Database Management, monitors, Exhibition Curation>
+<Digitization of Records, connectedTo, Access and Reference Services>
+<Digitization of Records, connectedTo, Authority Control for Archival Names>
+<Digitization of Records, connectedTo, Born_Digital Archiving>
+<Disaster Preparedness for Archives, acquires, Conservation Treatment>
+<Disaster Preparedness for Archives, connectedTo, Database Management>
+<Environmental Control, connectedTo, Born_Digital Archiving>
+<Environmental Control, partOf, Environmental Control>
+<Ethical Use of Archival Materials, connectedTo, Metadata Creation>
+<Ethical Use of Archival Materials, transcribes, Digitization of Records>
+<Ethical Use of Archival Materials, validates, Access and Reference Services>
+<Exhibition Curation, connectedTo, Long_Term Digital Preservation>
+<Exhibition Curation, partOf, Exhibition Curation>
+<Legal and Ethical Compliance, partOf, Legal and Ethical Compliance>
+<Legal and Ethical Compliance, preserves, Born_Digital Archiving>
+<Long_Term Digital Preservation, connectedTo, Environmental Control>
+<Long_Term Digital Preservation, partOf, Long_Term Digital Preservation>
+<Metadata Creation, conserves, Born_Digital Archiving>
+<Researchers Support, connectedTo, Acquisition and Accessioning>
+<Researchers Support, connectedTo, Database Management>
diff --git a/test/graphviz/graph_hard/graphviz_293.dot b/test/graphviz/graph_hard/graphviz_293.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c1583a517023a4f86d36597de32c11e79ce15712
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_293.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Public Access Systems" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Exhibition Curation" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N2 [label="Serialization and Item Control" color="#FBC02D" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N3 [label="Subject Indexing for Archives" color="#FFC107" fillcolor="#FFECB3" shape=folder style=filled]
+	N4 [label="Acquisition and Accessioning" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Arrangement and Description" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N6 [label="Environmental Control" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N7 [label="Researchers Support" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N8 [label="Records Retention Scheduling" color="#FFF176" fillcolor="#FFFDE7" shape=folder style=filled]
+	N9 [label="User Interface for Digital Archives" color="#FFF176" fillcolor="#FFFDE7" shape=folder style=filled]
+	N10 [label="Intellectual Property Rights Management" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N11 [label="Community Archiving Projects" color="#FFF176" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N12 [label="Digital Asset Management" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N13 [label="Database Management" color="#FFF176" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N14 [label="Access and Reference Services" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N15 [label="Emulation for Obsolete Formats" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N16 [label="Born_Digital Archiving" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+	N17 [label="Long_Term Digital Preservation" color="#FFF176" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N18 [label="Metadata Creation" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N19 [label="Digital Forensics for Archives" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Disaster Preparedness for Archives" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Archival Advocacy" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_1 [label="Preservation Planning" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_2 [label="Records Transfer Processes" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Legal and Ethical Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Provenance Tracking" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_1 [label="Security of Holdings" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N13 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N12 -> S0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N14 -> S2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S2 -> N18 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N12 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_294.txt b/test/graphviz/graph_hard/graphviz_294.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fe366e4b102a60917b932b2f9bdb853071ef1112
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_294.txt
@@ -0,0 +1,31 @@
+<Born_Digital Archiving, connectedTo, Outreach and Education>
+<Born_Digital Archiving, connectedTo, Subject Indexing for Archives>
+<Conservation Treatment, connectedTo, Records Transfer Processes>
+<Conservation Treatment, partOf, Conservation Treatment>
+<Database Management, connectedTo, Born_Digital Archiving>
+<Digital Asset Management, connectedTo, Emulation for Obsolete Formats>
+<Digital Asset Management, connectedTo, Subject Indexing for Archives>
+<Digital Forensics for Archives, disseminates, Exhibition Curation>
+<Digital Forensics for Archives, partOf, Digital Forensics for Archives>
+<Disaster Preparedness for Archives, connectedTo, Conservation Treatment>
+<Disaster Preparedness for Archives, partOf, Disaster Preparedness for Archives>
+<Emulation for Obsolete Formats, connectedTo, Database Management>
+<Emulation for Obsolete Formats, connectedTo, Security of Holdings>
+<Exhibition Curation, connectedTo, Emulation for Obsolete Formats>
+<Exhibition Curation, partOf, Exhibition Curation>
+<Legal and Ethical Compliance, connectedTo, Records Transfer Processes>
+<Outreach and Education, connectedTo, Digital Forensics for Archives>
+<Outreach and Education, connectedTo, Security of Holdings>
+<Outreach and Education, retrieves, Public Access Systems>
+<Provenance Tracking, partOf, Provenance Tracking>
+<Provenance Tracking, publishes, Disaster Preparedness for Archives>
+<Public Access Systems, connectedTo, Legal and Ethical Compliance>
+<Public Access Systems, connectedTo, Records Transfer Processes>
+<Public Access Systems, connectedTo, Security of Holdings>
+<Public Access Systems, connectedTo, Subject Indexing for Archives>
+<Records Transfer Processes, connectedTo, Subject Indexing for Archives>
+<Security of Holdings, connectedTo, Legal and Ethical Compliance>
+<Security of Holdings, connectedTo, Subject Indexing for Archives>
+<Security of Holdings, connectedTo, Web Archiving>
+<Web Archiving, connectedTo, Provenance Tracking>
+<Web Archiving, partOf, Web Archiving>
diff --git a/test/graphviz/graph_hard/graphviz_295.dot b/test/graphviz/graph_hard/graphviz_295.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b1cb84e2779d63415176c84d14c602039cf90a9a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_295.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=TD
+	N0 [label="Exhibition Design" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N1 [label="Digital Storytelling" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N2 [label="Gamification of Museum Experiences" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N3 [label="Virtual Reality Experiences" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N4 [label="Wayfinding Systems" color="#E91E63" fillcolor="#FCE4EC" shape=Mdiamond style=filled]
+	N5 [label="Interactive Display Development" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N6 [label="Multisensory Exhibits" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N7 [label="Digital Signage" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N8 [label="Exhibition Lighting Design" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N9 [label="Crowdsourcing for Collections" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N10 [label="Digital Preservation Strategies" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="User Experience Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cybersecurity for Museum Data" color="#E91E63" fillcolor="#FCE4EC" shape=plaintext style=filled]
+		nest0_1 [label="Collection Digitization" color="#CDDC39" fillcolor="#E6EE9C" shape=plaintext style=filled]
+		nest0_2 [label="Online Shop Integration" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest0_3 [label="3D Scanning of Artifacts" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=exhibits color="#E91E63" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Security Systems Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Member Management Systems" color="#E91E63" fillcolor="#FCE4EC" shape=folder style=filled]
+		nest1_1 [label="Research Databases Access" color="#E91E63" fillcolor="#FCE4EC" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=tracks color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=curates color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_295.txt b/test/graphviz/graph_hard/graphviz_295.txt
new file mode 100644
index 0000000000000000000000000000000000000000..dcbe33bc5fa3301ca6f789503efbf0541e35b5b8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_295.txt
@@ -0,0 +1,33 @@
+<3D Scanning of Artifacts, connectedTo, Digital Storytelling>
+<3D Scanning of Artifacts, partOf, 3D Scanning of Artifacts>
+<Collection Digitization, exhibits, Online Shop Integration>
+<Collection Digitization, partOf, Collection Digitization>
+<Crowdsourcing for Collections, curates, Digital Preservation Strategies>
+<Cybersecurity for Museum Data, connectedTo, Collection Digitization>
+<Cybersecurity for Museum Data, partOf, Cybersecurity for Museum Data>
+<Digital Signage, connectedTo, Crowdsourcing for Collections>
+<Digital Signage, connectedTo, Exhibition Lighting Design>
+<Digital Storytelling, connectedTo, Crowdsourcing for Collections>
+<Digital Storytelling, connectedTo, Digital Preservation Strategies>
+<Digital Storytelling, connectedTo, Gamification of Museum Experiences>
+<Digital Storytelling, connectedTo, Virtual Reality Experiences>
+<Exhibition Design, connectedTo, Digital Storytelling>
+<Exhibition Lighting Design, connectedTo, Crowdsourcing for Collections>
+<Gamification of Museum Experiences, tracks, Virtual Reality Experiences>
+<Interactive Display Development, connectedTo, Crowdsourcing for Collections>
+<Interactive Display Development, connectedTo, Digital Preservation Strategies>
+<Interactive Display Development, connectedTo, Digital Signage>
+<Interactive Display Development, connectedTo, Exhibition Lighting Design>
+<Interactive Display Development, connectedTo, Member Management Systems>
+<Interactive Display Development, connectedTo, Multisensory Exhibits>
+<Member Management Systems, connectedTo, Research Databases Access>
+<Member Management Systems, partOf, Member Management Systems>
+<Multisensory Exhibits, connectedTo, Cybersecurity for Museum Data>
+<Multisensory Exhibits, connectedTo, Digital Signage>
+<Online Shop Integration, connectedTo, 3D Scanning of Artifacts>
+<Online Shop Integration, partOf, Online Shop Integration>
+<Research Databases Access, connectedTo, Gamification of Museum Experiences>
+<Research Databases Access, partOf, Research Databases Access>
+<Virtual Reality Experiences, connectedTo, Crowdsourcing for Collections>
+<Virtual Reality Experiences, connectedTo, Wayfinding Systems>
+<Wayfinding Systems, connectedTo, Interactive Display Development>
diff --git a/test/graphviz/graph_hard/graphviz_296.dot b/test/graphviz/graph_hard/graphviz_296.dot
new file mode 100644
index 0000000000000000000000000000000000000000..423c50082175a65c5ddfebce6814dcdd1d58c674
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_296.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=LR
+	N0 [label="Virtual Tours" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Online Shop Integration" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N2 [label="RFID for Object Tracking" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N3 [label="Member Management Systems" color="#AED581" fillcolor="#F0F4C3" shape=folder style=filled]
+	N4 [label="Research Databases Access" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+	N5 [label="Wayfinding Systems" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N6 [label="Soundscape Design" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N7 [label="User Experience Design" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N8 [label="Interactive Kiosks" color="#9575CD" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+	N9 [label="Crowdsourcing for Collections" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N10 [label="Visitor Flow Analysis" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N11 [label="Collection Digitization" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N12 [label="Gamification of Museum Experiences" color="#61CAC3" fillcolor="#C2E8E6" shape=Mdiamond style=filled]
+	N13 [label="3D Printing for Replicas" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N14 [label="Interactive Display Development" color="#AED581" fillcolor="#F0F4C3" shape=folder style=filled]
+	N15 [label="Educational Technology Integration" color="#61CAC3" fillcolor="#C2E8E6" shape=octagon style=filled]
+	N16 [label="Digital Preservation Strategies" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N17 [label="3D Scanning of Artifacts" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Environmental Control Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Accessibility Technology for Visitors" color="#AED581" fillcolor="#F0F4C3" shape=Mdiamond style=filled]
+		nest0_1 [label="Virtual Reality Experiences" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest0_2 [label="Predictive Maintenance for Tech" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_3 [label="Visitor Analytics" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Database Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Robotics in Exhibits" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest1_1 [label="Multisensory Exhibits" color="#9575CD" fillcolor="#EDE7F6" shape=plaintext style=filled]
+		nest1_2 [label="Community Engagement Platforms" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=exhibits color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [label=designs color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label=manages color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label=scans color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N13 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N14 -> M1 [label=upgrades color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N17 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_296.txt b/test/graphviz/graph_hard/graphviz_296.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7d1e3781a4e546464be1f728108c636f68c68658
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_296.txt
@@ -0,0 +1,42 @@
+<3D Printing for Replicas, connectedTo, 3D Scanning of Artifacts>
+<3D Printing for Replicas, connectedTo, Interactive Display Development>
+<Accessibility Technology for Visitors, connectedTo, Virtual Reality Experiences>
+<Accessibility Technology for Visitors, partOf, Accessibility Technology for Visitors>
+<Collection Digitization, connectedTo, Gamification of Museum Experiences>
+<Community Engagement Platforms, connectedTo, RFID for Object Tracking>
+<Community Engagement Platforms, partOf, Community Engagement Platforms>
+<Crowdsourcing for Collections, connectedTo, Accessibility Technology for Visitors>
+<Crowdsourcing for Collections, connectedTo, Visitor Flow Analysis>
+<Digital Preservation Strategies, connectedTo, 3D Scanning of Artifacts>
+<Educational Technology Integration, connectedTo, Digital Preservation Strategies>
+<Gamification of Museum Experiences, connectedTo, 3D Printing for Replicas>
+<Interactive Display Development, connectedTo, Educational Technology Integration>
+<Interactive Display Development, upgrades, 3D Scanning of Artifacts>
+<Interactive Kiosks, connectedTo, Crowdsourcing for Collections>
+<Member Management Systems, connectedTo, Research Databases Access>
+<Multisensory Exhibits, connectedTo, Community Engagement Platforms>
+<Multisensory Exhibits, partOf, Multisensory Exhibits>
+<Online Shop Integration, connectedTo, RFID for Object Tracking>
+<Predictive Maintenance for Tech, connectedTo, Visitor Analytics>
+<Predictive Maintenance for Tech, partOf, Predictive Maintenance for Tech>
+<RFID for Object Tracking, connectedTo, Member Management Systems>
+<RFID for Object Tracking, connectedTo, Robotics in Exhibits>
+<RFID for Object Tracking, connectedTo, User Experience Design>
+<Research Databases Access, connectedTo, Soundscape Design>
+<Research Databases Access, connectedTo, User Experience Design>
+<Research Databases Access, connectedTo, Wayfinding Systems>
+<Research Databases Access, scans, Interactive Kiosks>
+<Robotics in Exhibits, connectedTo, Multisensory Exhibits>
+<Robotics in Exhibits, partOf, Robotics in Exhibits>
+<Soundscape Design, connectedTo, 3D Scanning of Artifacts>
+<Soundscape Design, connectedTo, User Experience Design>
+<User Experience Design, connectedTo, Interactive Kiosks>
+<Virtual Reality Experiences, connectedTo, Predictive Maintenance for Tech>
+<Virtual Reality Experiences, partOf, Virtual Reality Experiences>
+<Virtual Tours, exhibits, Online Shop Integration>
+<Visitor Analytics, designs, Research Databases Access>
+<Visitor Analytics, partOf, Visitor Analytics>
+<Visitor Flow Analysis, connectedTo, Collection Digitization>
+<Wayfinding Systems, connectedTo, Gamification of Museum Experiences>
+<Wayfinding Systems, connectedTo, Soundscape Design>
+<Wayfinding Systems, manages, Crowdsourcing for Collections>
diff --git a/test/graphviz/graph_hard/graphviz_297.dot b/test/graphviz/graph_hard/graphviz_297.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ad35fc3627bf0193bbd49739cf73fc1f6d6dba21
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_297.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=BT
+	N0 [label="Ticketing and Visitor Systems" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Research Databases Access" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N2 [label="Online Shop Integration" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N3 [label="Accessibility Technology for Visitors" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N4 [label="Predictive Maintenance for Tech" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N5 [label="Wayfinding Systems" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N6 [label="Mobile App Development" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N7 [label="Member Management Systems" color="#FFA726" fillcolor="#FFF3E0" shape=oval style=filled]
+	N8 [label="3D Printing for Replicas" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	S0 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Conservation Technology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Database Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+		nest0_1 [label="Robotics in Exhibits" color="#B8C0F5" fillcolor="#ECF0FD" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Digital Preservation Strategies" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Security Systems Integration" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+		nest1_1 [label="Multisensory Exhibits" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+		nest1_2 [label="Content Management Systems" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest1_3 [label="Visitor Analytics" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=notifies color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=entertains color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label=documents color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_298.txt b/test/graphviz/graph_hard/graphviz_298.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9f8ffcfafbc7bded9805bbe50e3040d1150e0fe1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_298.txt
@@ -0,0 +1,43 @@
+<Anti_Bribery and Corruption Compliance, connectedTo, Compliance Hotlines>
+<Anti_Bribery and Corruption Compliance, partOf, Anti_Bribery and Corruption Compliance>
+<Anti_Money Laundering Compliance, connectedTo, Stakeholder Engagement on Ethics>
+<Anti_Money Laundering Compliance, partOf, Anti_Money Laundering Compliance>
+<Bias Mitigation, connectedTo, Ethical Decision_Making Frameworks>
+<CSR Reporting, connectedTo, Monitoring and Enforcement>
+<Code of Conduct Implementation, connectedTo, Stakeholder Engagement on Ethics>
+<Compliance Hotlines, connectedTo, Financial Regulations Compliance>
+<Compliance Hotlines, partOf, Compliance Hotlines>
+<Compliance Software Implementation, connectedTo, Incident Response Planning>
+<Compliance Software Implementation, data, CSR Reporting>
+<Compliance Software Implementation, educates, Ethical Decision_Making Frameworks>
+<Compliance Software Implementation, enforces, Ethical Decision_Making Frameworks>
+<Compliance Software Implementation, guides, Stakeholder Engagement on Ethics>
+<Conflict of Interest Management, connectedTo, Financial Regulations Compliance>
+<Consumer Protection Compliance, fairness, Code of Conduct Implementation>
+<Corporate Governance Standards, connectedTo, ESG Integration>
+<Corporate Governance Standards, connectedTo, Environmental Compliance>
+<Corporate Governance Standards, connectedTo, Financial Regulations Compliance>
+<Data Privacy Compliance, connectedTo, CSR Reporting>
+<ESG Integration, certifies, Conflict of Interest Management>
+<ESG Integration, connectedTo, Third_Party Due Diligence>
+<Environmental Compliance, connectedTo, Anti_Bribery and Corruption Compliance>
+<Environmental Compliance, partOf, Environmental Compliance>
+<Ethical AI Guidelines, connectedTo, Anti_Money Laundering Compliance>
+<Ethical AI Guidelines, partOf, Ethical AI Guidelines>
+<Ethical Decision_Making Frameworks, connectedTo, Reporting Mechanisms>
+<Ethical Leadership Development, connectedTo, Corporate Governance Standards>
+<Financial Regulations Compliance, connectedTo, Consumer Protection Compliance>
+<Incident Response Planning, connectedTo, Ethical Decision_Making Frameworks>
+<Incident Response Planning, connectedTo, Financial Regulations Compliance>
+<Incident Response Planning, procedures, Bias Mitigation>
+<Monitoring and Enforcement, connectedTo, Ethical Leadership Development>
+<Monitoring and Enforcement, connectedTo, Financial Regulations Compliance>
+<Monitoring and Enforcement, connectedTo, Regulatory Interpretation>
+<Monitoring and Enforcement, connectedTo, Stakeholder Engagement on Ethics>
+<Regulatory Interpretation, connectedTo, Ethical Leadership Development>
+<Reporting Mechanisms, connectedTo, Data Privacy Compliance>
+<Reporting Mechanisms, connectedTo, Financial Regulations Compliance>
+<Reporting Mechanisms, connectedTo, Risk Assessment>
+<Stakeholder Engagement on Ethics, connectedTo, Risk Assessment>
+<Third_Party Due Diligence, connectedTo, Ethical AI Guidelines>
+<Third_Party Due Diligence, partOf, Third_Party Due Diligence>
diff --git a/test/graphviz/graph_hard/graphviz_3.dot b/test/graphviz/graph_hard/graphviz_3.dot
new file mode 100644
index 0000000000000000000000000000000000000000..baa370d47e2cf8aa29ebe171a3927c56d5ac2349
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_3.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="Dispute Resolution" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Venture Capital Funding" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N2 [label="Wealth Management" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N3 [label="Merger and Acquisition" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N4 [label="Financial Reporting" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N5 [label="Income Verification" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N6 [label="Securities Trading" color="#D3EB9F" fillcolor="#F8FDD3" shape=Mdiamond style=filled]
+	N7 [label="Loan Processing" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N8 [label="Investment Planning" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+	N9 [label="Debt Collection" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N10 [label="Market Analysis" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N11 [label="Forex Trading" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Blockchain Verification" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="KYC Validation" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+		nest0_1 [label="Account Verification" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Fraud Check" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Transaction Audit" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_1 [label="Cryptocurrency Exchange" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+		nest1_2 [label="Fund Disbursement" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N9 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label=screens color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=models color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [label=executes color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [label=optimizes color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_3.txt b/test/graphviz/graph_hard/graphviz_3.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9c3cd2d430671f033d1921da2b3e6769792db8e8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_3.txt
@@ -0,0 +1,39 @@
+<Account Verification, connectedTo, Debt Collection>
+<Account Verification, partOf, Account Verification>
+<Cryptocurrency Exchange, connectedTo, Fund Disbursement>
+<Cryptocurrency Exchange, partOf, Cryptocurrency Exchange>
+<Debt Collection, connectedTo, Market Analysis>
+<Dispute Resolution, connectedTo, Merger and Acquisition>
+<Dispute Resolution, connectedTo, Securities Trading>
+<Dispute Resolution, connectedTo, Venture Capital Funding>
+<Financial Reporting, connectedTo, Income Verification>
+<Financial Reporting, connectedTo, Investment Planning>
+<Financial Reporting, connectedTo, Market Analysis>
+<Financial Reporting, connectedTo, Securities Trading>
+<Financial Reporting, models, Debt Collection>
+<Financial Reporting, screens, Securities Trading>
+<Fund Disbursement, connectedTo, Income Verification>
+<Fund Disbursement, partOf, Fund Disbursement>
+<Income Verification, connectedTo, Securities Trading>
+<Investment Planning, connectedTo, Debt Collection>
+<KYC Validation, connectedTo, Account Verification>
+<KYC Validation, partOf, KYC Validation>
+<Loan Processing, connectedTo, Forex Trading>
+<Loan Processing, connectedTo, Investment Planning>
+<Loan Processing, connectedTo, Market Analysis>
+<Loan Processing, executes, Debt Collection>
+<Market Analysis, connectedTo, Forex Trading>
+<Market Analysis, connectedTo, KYC Validation>
+<Merger and Acquisition, connectedTo, Financial Reporting>
+<Merger and Acquisition, connectedTo, Securities Trading>
+<Securities Trading, connectedTo, Loan Processing>
+<Transaction Audit, connectedTo, Cryptocurrency Exchange>
+<Transaction Audit, partOf, Transaction Audit>
+<Venture Capital Funding, connectedTo, Financial Reporting>
+<Venture Capital Funding, connectedTo, Investment Planning>
+<Venture Capital Funding, connectedTo, Merger and Acquisition>
+<Venture Capital Funding, connectedTo, Wealth Management>
+<Venture Capital Funding, optimizes, Debt Collection>
+<Wealth Management, connectedTo, Merger and Acquisition>
+<Wealth Management, connectedTo, Securities Trading>
+<Wealth Management, connectedTo, Transaction Audit>
diff --git a/test/graphviz/graph_hard/graphviz_300.dot b/test/graphviz/graph_hard/graphviz_300.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7a0d834fef69e556b2820984921b6004bdef46bc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_300.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=LR
+	N0 [label="Consumer Protection Compliance" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N1 [label="Ethics Committee Formation" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N2 [label="Information Security Compliance" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N3 [label="CSR Reporting" color="#BA68C8" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+	N4 [label="Third_Party Due Diligence" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N5 [label="Legal Advisory" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N6 [label="Code of Conduct Implementation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N7 [label="Stakeholder Engagement on Ethics" color="#FF8A65" fillcolor="#FBE9E7" shape=oval style=filled]
+	N8 [label="Ethical Decision_Making Frameworks" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N9 [label="Internal Investigations" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N10 [label="Ethical Leadership Development" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N11 [label="Product Safety Compliance" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Transparent Communication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Data Privacy Compliance" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+		nest0_1 [label="Fair Competition Compliance" color="#FF8A65" fillcolor="#FBE9E7" shape=plaintext style=filled]
+		nest0_2 [label="Corporate Governance Standards" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Compliance Software Implementation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Ethics" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_1 [label="Sanctions Compliance" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+		nest1_2 [label="Regulatory Interpretation" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest1_3 [label="Ethical AI Guidelines" color="#FF8A65" fillcolor="#FBE9E7" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=secures color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=privacy color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [label=reviews color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M2 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_301.dot b/test/graphviz/graph_hard/graphviz_301.dot
new file mode 100644
index 0000000000000000000000000000000000000000..484c95b4e244d504a3f09d1bea4a590c58c6098c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_301.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Toolmark Analysis" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Mobile Device Forensics" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N2 [label="Handwriting Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N3 [label="Laboratory Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+	N4 [label="Toxicology Testing" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N5 [label="Malware Analysis" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N6 [label="Forensic Entomology" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N7 [label="Cold Case Review" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N8 [label="Evidence Preservation" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+	N9 [label="Bloodstain Pattern Analysis" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N10 [label="Forensic Anthropology" color="#FFE470" fillcolor="#FFFAE0" shape=Mdiamond style=filled]
+	N11 [label="Expert Witness Testimony" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N12 [label="Digital Forensics" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N13 [label="Forensic Photography" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N14 [label="Network Forensics" color="#CFCFCF" fillcolor="#F6F6F6" shape=parallelogram style=filled]
+	N15 [label="Forensic Odontology" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N16 [label="Fingerprint Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N17 [label="Forensic Accounting" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+	N18 [label="Polygraph Examination" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N19 [label="Forensic Interviewing" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Ballistics Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cloud Forensics" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest0_1 [label="Facial Recognition" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+		nest0_2 [label="Trace Evidence Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+		nest0_3 [label="Evidence Collection" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Forensic Botany" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Courtroom Presentation" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+		nest1_1 [label="Voice Recognition" color="#CFCFCF" fillcolor="#F6F6F6" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N19 [label=DNA_profiles color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> S0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N13 -> S1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S1 -> N19 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N19 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N18 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_301.txt b/test/graphviz/graph_hard/graphviz_301.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a584cc4f4bed06e48e5d8652164fb8c10d6ed64d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_301.txt
@@ -0,0 +1,42 @@
+<Bloodstain Pattern Analysis, connectedTo, Forensic Anthropology>
+<Bloodstain Pattern Analysis, connectedTo, Forensic Interviewing>
+<Cloud Forensics, connectedTo, Facial Recognition>
+<Cloud Forensics, partOf, Cloud Forensics>
+<Cold Case Review, connectedTo, Evidence Preservation>
+<Courtroom Presentation, connectedTo, Voice Recognition>
+<Courtroom Presentation, partOf, Courtroom Presentation>
+<Digital Forensics, connectedTo, Forensic Photography>
+<Evidence Collection, connectedTo, Toxicology Testing>
+<Evidence Collection, partOf, Evidence Collection>
+<Evidence Preservation, connectedTo, Bloodstain Pattern Analysis>
+<Expert Witness Testimony, connectedTo, Digital Forensics>
+<Facial Recognition, connectedTo, Trace Evidence Analysis>
+<Facial Recognition, partOf, Facial Recognition>
+<Fingerprint Analysis, connectedTo, Forensic Accounting>
+<Forensic Accounting, connectedTo, Polygraph Examination>
+<Forensic Anthropology, connectedTo, Expert Witness Testimony>
+<Forensic Anthropology, connectedTo, Forensic Interviewing>
+<Forensic Entomology, connectedTo, Cold Case Review>
+<Forensic Odontology, connectedTo, Fingerprint Analysis>
+<Forensic Photography, connectedTo, Forensic Interviewing>
+<Forensic Photography, connectedTo, Network Forensics>
+<Forensic Photography, connectedTo, Polygraph Examination>
+<Handwriting Analysis, connectedTo, Cloud Forensics>
+<Handwriting Analysis, connectedTo, Laboratory Analysis>
+<Laboratory Analysis, connectedTo, Courtroom Presentation>
+<Laboratory Analysis, connectedTo, Polygraph Examination>
+<Laboratory Analysis, connectedTo, Toxicology Testing>
+<Malware Analysis, connectedTo, Forensic Entomology>
+<Mobile Device Forensics, connectedTo, Handwriting Analysis>
+<Network Forensics, connectedTo, Fingerprint Analysis>
+<Network Forensics, connectedTo, Forensic Accounting>
+<Network Forensics, connectedTo, Forensic Odontology>
+<Network Forensics, connectedTo, Polygraph Examination>
+<Polygraph Examination, connectedTo, Forensic Interviewing>
+<Toolmark Analysis, connectedTo, Mobile Device Forensics>
+<Toxicology Testing, connectedTo, Malware Analysis>
+<Toxicology Testing, connectedTo, Polygraph Examination>
+<Trace Evidence Analysis, connectedTo, Evidence Collection>
+<Trace Evidence Analysis, partOf, Trace Evidence Analysis>
+<Voice Recognition, DNA_profiles, Forensic Interviewing>
+<Voice Recognition, partOf, Voice Recognition>
diff --git a/test/graphviz/graph_hard/graphviz_302.txt b/test/graphviz/graph_hard/graphviz_302.txt
new file mode 100644
index 0000000000000000000000000000000000000000..26f79414dddf5fd1a251d0886e8e67de78fda7ea
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_302.txt
@@ -0,0 +1,34 @@
+<Chain of Custody Management, connectedTo, Toxicology Testing>
+<Chain of Custody Management, partOf, Chain of Custody Management>
+<Cloud Forensics, connectedTo, Data Recovery>
+<Cloud Forensics, partOf, Cloud Forensics>
+<Cold Case Review, connectedTo, Crime Database Search>
+<Crime Database Search, connectedTo, Forensic Entomology>
+<Cyber Crime Investigation, connectedTo, Chain of Custody Management>
+<Cyber Crime Investigation, partOf, Cyber Crime Investigation>
+<Data Recovery, connectedTo, Crime Database Search>
+<Data Recovery, connectedTo, Forensic Photography>
+<Data Recovery, connectedTo, Voice Recognition>
+<Document Examination, compares, Data Recovery>
+<Document Examination, connectedTo, Crime Database Search>
+<Facial Recognition, connectedTo, Cloud Forensics>
+<Facial Recognition, partOf, Facial Recognition>
+<Forensic Entomology, connectedTo, Voice Recognition>
+<Forensic Photography, connectedTo, Cold Case Review>
+<Forensic Photography, connectedTo, Crime Database Search>
+<Forensic Photography, connectedTo, Evidence Preservation>
+<Forensic Photography, connectedTo, Malware Analysis>
+<Forensic Photography, connectedTo, Vehicle Forensics>
+<Forensic Photography, connectedTo, Voice Recognition>
+<Laboratory Analysis, connectedTo, Evidence Preservation>
+<Laboratory Analysis, connectedTo, Malware Analysis>
+<Laboratory Analysis, connectedTo, Vehicle Forensics>
+<Laboratory Analysis, fingerprints, Facial Recognition>
+<Malware Analysis, connectedTo, Evidence Preservation>
+<Mobile Device Forensics, connectedTo, Toxicology Testing>
+<Toxicology Testing, connectedTo, Laboratory Analysis>
+<Vehicle Forensics, connectedTo, Cyber Crime Investigation>
+<Vehicle Forensics, connectedTo, Malware Analysis>
+<Voice Recognition, connectedTo, Malware Analysis>
+<Voice Recognition, connectedTo, Mobile Device Forensics>
+<Voice Recognition, connectedTo, Vehicle Forensics>
diff --git a/test/graphviz/graph_hard/graphviz_303.txt b/test/graphviz/graph_hard/graphviz_303.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ffc80b57bac274ccb3ebaffd9de50837649034bd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_303.txt
@@ -0,0 +1,41 @@
+<Arson Investigation, connectedTo, Forensic Odontology>
+<Arson Investigation, partOf, Arson Investigation>
+<Bloodstain Pattern Analysis, connectedTo, Crime Database Search>
+<Bloodstain Pattern Analysis, connectedTo, Handwriting Analysis>
+<Chain of Custody Management, connectedTo, Data Recovery>
+<Chain of Custody Management, connectedTo, Forensic Anthropology>
+<Chain of Custody Management, connectedTo, Forensic Psychology>
+<Chain of Custody Management, connectedTo, Network Forensics>
+<Chain of Custody Management, crime_scenes, Forensic Odontology>
+<Cloud Forensics, connectedTo, Cyber Crime Investigation>
+<Crime Database Search, connectedTo, Handwriting Analysis>
+<Crime Database Search, connectedTo, Legal Standards Compliance>
+<Cyber Crime Investigation, analyzes, Laboratory Analysis>
+<Cyber Crime Investigation, connectedTo, Handwriting Analysis>
+<Data Recovery, connectedTo, Forensic Odontology>
+<Evidence Collection, DNA_profiles, Data Recovery>
+<Evidence Collection, connectedTo, Chain of Custody Management>
+<Evidence Collection, connectedTo, Forensic Psychology>
+<Facial Recognition, connectedTo, Bloodstain Pattern Analysis>
+<Facial Recognition, connectedTo, Handwriting Analysis>
+<Forensic Anthropology, connectedTo, Data Recovery>
+<Forensic Anthropology, connectedTo, Forensic Odontology>
+<Forensic Anthropology, connectedTo, Forensic Psychology>
+<Forensic Botany, connectedTo, Mobile Device Forensics>
+<Forensic Botany, partOf, Forensic Botany>
+<Forensic Interviewing, connectedTo, Forensic Anthropology>
+<Forensic Interviewing, partOf, Forensic Interviewing>
+<Forensic Psychology, connectedTo, Data Recovery>
+<Handwriting Analysis, detects, Evidence Collection>
+<Laboratory Analysis, connectedTo, Forensic Botany>
+<Laboratory Analysis, partOf, Laboratory Analysis>
+<Legal Standards Compliance, connectedTo, Cloud Forensics>
+<Legal Standards Compliance, researches, Handwriting Analysis>
+<Mobile Device Forensics, connectedTo, Forensic Interviewing>
+<Mobile Device Forensics, partOf, Mobile Device Forensics>
+<Network Forensics, advises, Trace Evidence Analysis>
+<Network Forensics, connectedTo, Forensic Anthropology>
+<Trace Evidence Analysis, partOf, Trace Evidence Analysis>
+<Trace Evidence Analysis, toxicology, Vehicle Forensics>
+<Vehicle Forensics, connectedTo, Arson Investigation>
+<Vehicle Forensics, partOf, Vehicle Forensics>
diff --git a/test/graphviz/graph_hard/graphviz_305.txt b/test/graphviz/graph_hard/graphviz_305.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d1df975227836db896a92a7dc57087f88c6f3344
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_305.txt
@@ -0,0 +1,34 @@
+<Airport Security, connectedTo, Risk_Based Security Measures>
+<Airport Security, vulnerabilities_reduces, Homeland Security Planning>
+<Behavioral Threat Assessment, connectedTo, Counter_Propaganda>
+<Behavioral Threat Assessment, connectedTo, Military Counterterrorism>
+<Behavioral Threat Assessment, partOf, Behavioral Threat Assessment>
+<Biometric Screening, connectedTo, Transportation Security>
+<Bomb Disposal, connectedTo, Counter_Propaganda>
+<Bomb Disposal, partOf, Bomb Disposal>
+<Counter_Propaganda, connectedTo, Behavioral Threat Assessment>
+<Counter_Propaganda, partOf, Counter_Propaganda>
+<Crisis Response Planning, connectedTo, Military Counterterrorism>
+<Homeland Security Planning, connectedTo, Terrorism Financing Interdiction>
+<Homeland Security Planning, partOf, Homeland Security Planning>
+<Insider Threat Programs, connectedTo, Airport Security>
+<Insider Threat Programs, connectedTo, Biometric Screening>
+<Insider Threat Programs, connectedTo, Crisis Response Planning>
+<Intelligence Analysis, connectedTo, Airport Security>
+<Intelligence Analysis, connectedTo, Threat Assessment>
+<International Cooperation, connectedTo, Airport Security>
+<International Cooperation, connectedTo, Insider Threat Programs>
+<Military Counterterrorism, connectedTo, Port Security>
+<Port Security, connectedTo, Biometric Screening>
+<Post_Incident Recovery, connectedTo, Risk Analysis>
+<Psychological Operations, connectedTo, Airport Security>
+<Psychological Operations, connectedTo, International Cooperation>
+<Public Awareness Campaigns, connectedTo, Post_Incident Recovery>
+<Risk_Based Security Measures, connectedTo, Crisis Response Planning>
+<Terrorism Financing Interdiction, connectedTo, International Cooperation>
+<Terrorism Financing Interdiction, connectedTo, Risk_Based Security Measures>
+<Terrorism Financing Interdiction, partOf, Terrorism Financing Interdiction>
+<Threat Assessment, connectedTo, Homeland Security Planning>
+<Threat Assessment, technologies_applies, Psychological Operations>
+<Transportation Security, connectedTo, Bomb Disposal>
+<Transportation Security, connectedTo, Public Awareness Campaigns>
diff --git a/test/graphviz/graph_hard/graphviz_307.dot b/test/graphviz/graph_hard/graphviz_307.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f53e50251a276f2f5d1320f619814cff6438dbca
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_307.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=TD
+	N0 [label="Environmental Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Physical Security Integration" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N2 [label="Sensor Network Deployment" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N3 [label="GPS Tracking" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N4 [label="Network Monitoring" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Real_time Alerts" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+	N6 [label="Internet Traffic Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+	N7 [label="Anomaly Detection" color="#8C9EFF" fillcolor="#D3D7EB" shape=plaintext style=filled]
+	N8 [label="Night Vision Technology" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N9 [label="Traffic Surveillance" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N10 [label="Asset Tracking" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Audio Surveillance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Biometric Data Analysis" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest0_1 [label="Automated Threat Detection" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Remote Sensing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="CCTV Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+		nest1_1 [label="Data Storage and Retention" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+		nest1_2 [label="Drone Surveillance" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_3 [label="Cyber Surveillance" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=records color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=installs color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=tracks color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label=verifies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_308.dot b/test/graphviz/graph_hard/graphviz_308.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ce5f3ce4aa7742ce6d40b3fc1a9c55dcb124e2a9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_308.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=BT
+	N0 [label="Video Analytics" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Behavioral Analytics" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N2 [label="Wildlife Tracking" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+	N3 [label="Legal Compliance" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N4 [label="Security Personnel Operations" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N5 [label="Data Collection" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N6 [label="Internet Traffic Monitoring" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N7 [label="Audio Surveillance" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N8 [label="Facial Recognition Systems" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N9 [label="Border Surveillance" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N10 [label="Perimeter Security" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N11 [label="Ethical Guidelines" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N12 [label="Privacy Concerns Mitigation" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N13 [label="Network Monitoring" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N14 [label="Anomaly Detection" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Data Storage and Retention" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Environmental Monitoring" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest0_1 [label="GPS Tracking" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_2 [label="Asset Tracking" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+		nest0_3 [label="Remote Sensing" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=captures color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="CCTV Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Social Media Monitoring" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+		nest1_1 [label="Public Space Monitoring" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+		nest1_2 [label="Biometric Data Analysis" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+		nest1_3 [label="Automated Threat Detection" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=identifies color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=tracks color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [label=analyzes color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N12 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_308.txt b/test/graphviz/graph_hard/graphviz_308.txt
new file mode 100644
index 0000000000000000000000000000000000000000..11b97ff956e03072795d26cd9823bfa534680733
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_308.txt
@@ -0,0 +1,39 @@
+<Asset Tracking, connectedTo, Remote Sensing>
+<Asset Tracking, partOf, Asset Tracking>
+<Audio Surveillance, tracks, Facial Recognition Systems>
+<Automated Threat Detection, connectedTo, Legal Compliance>
+<Automated Threat Detection, partOf, Automated Threat Detection>
+<Behavioral Analytics, connectedTo, Social Media Monitoring>
+<Behavioral Analytics, connectedTo, Wildlife Tracking>
+<Biometric Data Analysis, connectedTo, Automated Threat Detection>
+<Biometric Data Analysis, connectedTo, Privacy Concerns Mitigation>
+<Biometric Data Analysis, partOf, Biometric Data Analysis>
+<Border Surveillance, connectedTo, Perimeter Security>
+<Data Collection, identifies, Internet Traffic Monitoring>
+<Environmental Monitoring, connectedTo, GPS Tracking>
+<Environmental Monitoring, partOf, Environmental Monitoring>
+<Ethical Guidelines, connectedTo, Anomaly Detection>
+<Ethical Guidelines, connectedTo, Network Monitoring>
+<Ethical Guidelines, connectedTo, Privacy Concerns Mitigation>
+<Facial Recognition Systems, connectedTo, Border Surveillance>
+<Facial Recognition Systems, connectedTo, Ethical Guidelines>
+<GPS Tracking, captures, Asset Tracking>
+<GPS Tracking, partOf, GPS Tracking>
+<Internet Traffic Monitoring, connectedTo, Audio Surveillance>
+<Legal Compliance, connectedTo, Environmental Monitoring>
+<Legal Compliance, connectedTo, Security Personnel Operations>
+<Network Monitoring, connectedTo, Anomaly Detection>
+<Perimeter Security, connectedTo, Anomaly Detection>
+<Perimeter Security, connectedTo, Ethical Guidelines>
+<Perimeter Security, connectedTo, Network Monitoring>
+<Privacy Concerns Mitigation, connectedTo, Network Monitoring>
+<Public Space Monitoring, connectedTo, Biometric Data Analysis>
+<Public Space Monitoring, partOf, Public Space Monitoring>
+<Remote Sensing, connectedTo, Behavioral Analytics>
+<Remote Sensing, partOf, Remote Sensing>
+<Security Personnel Operations, analyzes, Ethical Guidelines>
+<Security Personnel Operations, connectedTo, Data Collection>
+<Social Media Monitoring, connectedTo, Public Space Monitoring>
+<Social Media Monitoring, partOf, Social Media Monitoring>
+<Video Analytics, connectedTo, Behavioral Analytics>
+<Wildlife Tracking, connectedTo, Legal Compliance>
diff --git a/test/graphviz/graph_hard/graphviz_309.dot b/test/graphviz/graph_hard/graphviz_309.dot
new file mode 100644
index 0000000000000000000000000000000000000000..59b64b2406116f042d8106956c7d5624091775c4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_309.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Social Media Monitoring" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="Data Collection" color="#90A4AE" fillcolor="#ECEFF1" shape=octagon style=filled]
+	N2 [label="Access Control Systems" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N3 [label="Asset Tracking" color="#73C6BC" fillcolor="#D0EFEE" shape=Mdiamond style=filled]
+	N4 [label="Perimeter Security" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N5 [label="Satellite Imaging" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N6 [label="Sensor Network Deployment" color="#73C6BC" fillcolor="#D0EFEE" shape=octagon style=filled]
+	N7 [label="Automated Threat Detection" color="#FFE470" fillcolor="#FFFAE0" shape=octagon style=filled]
+	N8 [label="Audio Surveillance" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N9 [label="Predictive Policing" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N10 [label="Internet Traffic Monitoring" color="#FFE470" fillcolor="#FFFAE0" shape=Mdiamond style=filled]
+	N11 [label="Border Surveillance" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N12 [label="Wildlife Tracking" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="CCTV Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="GPS Tracking" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+		nest0_1 [label="Industrial Surveillance" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_2 [label="Video Analytics" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Legal Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Anomaly Detection" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+		nest1_1 [label="Cyber Surveillance" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=secures color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=tracks color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> nest0_0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N3 [label=automates color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_309.txt b/test/graphviz/graph_hard/graphviz_309.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9af38c4f6bba30acdd7e4aebb9953219204c26c8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_309.txt
@@ -0,0 +1,34 @@
+<Access Control Systems, connectedTo, Asset Tracking>
+<Access Control Systems, connectedTo, Perimeter Security>
+<Anomaly Detection, connectedTo, Cyber Surveillance>
+<Anomaly Detection, partOf, Anomaly Detection>
+<Asset Tracking, connectedTo, Perimeter Security>
+<Audio Surveillance, connectedTo, Predictive Policing>
+<Automated Threat Detection, connectedTo, Audio Surveillance>
+<Border Surveillance, connectedTo, GPS Tracking>
+<Border Surveillance, connectedTo, Wildlife Tracking>
+<Cyber Surveillance, automates, Asset Tracking>
+<Cyber Surveillance, partOf, Cyber Surveillance>
+<Data Collection, connectedTo, Access Control Systems>
+<Data Collection, connectedTo, Anomaly Detection>
+<Data Collection, connectedTo, Automated Threat Detection>
+<Data Collection, connectedTo, Perimeter Security>
+<Data Collection, connectedTo, Predictive Policing>
+<GPS Tracking, connectedTo, Industrial Surveillance>
+<GPS Tracking, partOf, GPS Tracking>
+<Industrial Surveillance, connectedTo, Video Analytics>
+<Industrial Surveillance, partOf, Industrial Surveillance>
+<Internet Traffic Monitoring, connectedTo, Border Surveillance>
+<Perimeter Security, connectedTo, Predictive Policing>
+<Perimeter Security, secures, Satellite Imaging>
+<Predictive Policing, connectedTo, Internet Traffic Monitoring>
+<Satellite Imaging, connectedTo, Audio Surveillance>
+<Satellite Imaging, connectedTo, Predictive Policing>
+<Satellite Imaging, connectedTo, Wildlife Tracking>
+<Satellite Imaging, tracks, Sensor Network Deployment>
+<Sensor Network Deployment, connectedTo, Automated Threat Detection>
+<Sensor Network Deployment, connectedTo, Predictive Policing>
+<Social Media Monitoring, connectedTo, Data Collection>
+<Social Media Monitoring, connectedTo, Predictive Policing>
+<Video Analytics, connectedTo, Asset Tracking>
+<Video Analytics, partOf, Video Analytics>
diff --git a/test/graphviz/graph_hard/graphviz_31.txt b/test/graphviz/graph_hard/graphviz_31.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a13c3cef9a55fec6c84141f12c34a36bfad05827
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_31.txt
@@ -0,0 +1,34 @@
+<Animal Health Monitoring, partOf, Animal Health Monitoring>
+<Animal Health Monitoring, sensors, Farm Maintenance>
+<Aquaculture Farming, connectedTo, Crop Monitoring>
+<Aquaculture Farming, connectedTo, Subsidy Application>
+<Barn Cleaning, connectedTo, Aquaculture Farming>
+<Barn Cleaning, connectedTo, Crop Monitoring>
+<Barn Cleaning, connectedTo, Greenhouse Control>
+<Barn Cleaning, monitors, Weed Removal>
+<Crop Monitoring, connectedTo, Forestry Management>
+<Farm Maintenance, connectedTo, Seed Sowing>
+<Farm Maintenance, partOf, Farm Maintenance>
+<Fencing Installation, connectedTo, Irrigation Scheduling>
+<Fencing Installation, partOf, Fencing Installation>
+<Food Processing, connectedTo, Animal Health Monitoring>
+<Food Processing, connectedTo, Produce Sorting>
+<Forestry Management, connectedTo, Food Processing>
+<Forestry Management, connectedTo, Harvesting>
+<Forestry Management, connectedTo, Produce Sorting>
+<Greenhouse Control, connectedTo, Weed Removal>
+<Harvesting, connectedTo, Food Processing>
+<Irrigation Scheduling, connectedTo, Weather Tracking>
+<Irrigation Scheduling, partOf, Irrigation Scheduling>
+<Seed Sowing, connectedTo, Yield Prediction>
+<Seed Sowing, partOf, Seed Sowing>
+<Subsidy Application, connectedTo, Crop Monitoring>
+<Subsidy Application, connectedTo, Fencing Installation>
+<Subsidy Application, connectedTo, Forestry Management>
+<Weather Tracking, connectedTo, Aquaculture Farming>
+<Weather Tracking, partOf, Weather Tracking>
+<Weed Removal, connectedTo, Aquaculture Farming>
+<Weed Removal, connectedTo, Crop Monitoring>
+<Weed Removal, connectedTo, Forestry Management>
+<Yield Prediction, connectedTo, Forestry Management>
+<Yield Prediction, partOf, Yield Prediction>
diff --git a/test/graphviz/graph_hard/graphviz_310.dot b/test/graphviz/graph_hard/graphviz_310.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cb1c05ec1e9ce5c33d09f2ef5d2ffb5409311691
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_310.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Domestic Violence Prevention" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N1 [label="Reintegration Programs" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N2 [label="Crime Data Analysis" color="#9C27B0" fillcolor="#E1BEE7" shape=octagon style=filled]
+	N3 [label="Drug Prevention Initiatives" color="#BDBDBD" fillcolor="#F5F5F5" shape=Mdiamond style=filled]
+	N4 [label="Crisis Intervention" color="#9C27B0" fillcolor="#E1BEE7" shape=octagon style=filled]
+	N5 [label="Identity Theft Prevention" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N6 [label="School Safety Programs" color="#9C27B0" fillcolor="#E1BEE7" shape=folder style=filled]
+	N7 [label="Police_Community Relations" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+	N8 [label="Cybercrime Prevention" color="#FF9800" fillcolor="#FFE0B2" shape=parallelogram style=filled]
+	N9 [label="Conflict Resolution Training" color="#FF9800" fillcolor="#FFE0B2" shape=Mdiamond style=filled]
+	N10 [label="Environmental Design" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	S0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Vehicle Theft Prevention" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Situational Crime Prevention" color="#9C27B0" fillcolor="#E1BEE7" shape=folder style=filled]
+		nest0_1 [label="Technology for Prevention" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest0_2 [label="Public Awareness Campaigns" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Robbery Prevention" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Security Lighting" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+		nest1_1 [label="Deterrence Strategies" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+		nest1_2 [label="Policy Development for Prevention" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N9 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [label=reports color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N6 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [label=hotspots color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label=prevents color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	M2 -> N8 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_311.dot b/test/graphviz/graph_hard/graphviz_311.dot
new file mode 100644
index 0000000000000000000000000000000000000000..120829b3504a9143503869aece5dfe7f66ce6560
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_311.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=BT
+	N0 [label="Gang Intervention" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N1 [label="Behavioral Science in Prevention" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N2 [label="Crime Data Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N3 [label="Conflict Resolution Training" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N4 [label="Target Hardening" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N5 [label="Environmental Design" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+	N6 [label="Early Intervention Programs" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N7 [label="Restorative Justice" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N8 [label="Drug Prevention Initiatives" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+	N9 [label="Neighborhood Watch Programs" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N10 [label="Vehicle Theft Prevention" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N11 [label="Cybercrime Prevention" color="#26A69A" fillcolor="#E0F2F1" shape=folder style=filled]
+	N12 [label="Community Policing" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N13 [label="Public Awareness Campaigns" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N14 [label="Robbery Prevention" color="#26A69A" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N15 [label="Hotspot Policing" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+	N16 [label="Identity Theft Prevention" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Security Lighting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Reintegration Programs" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+		nest0_1 [label="Law Enforcement Training" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest0_2 [label="School Safety Programs" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest0_3 [label="Patrol Operations" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Crime Prevention Through Education" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Domestic Violence Prevention" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_1 [label="Sexual Assault Prevention" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+		nest1_2 [label="Mediation Services" color="#AABEC6" fillcolor="#E0E6E9" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N16 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N13 -> M2 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	M2 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_311.txt b/test/graphviz/graph_hard/graphviz_311.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c36bc9318f8bad301f1ec9cb75f5aad98ce06f6c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_311.txt
@@ -0,0 +1,47 @@
+<Behavioral Science in Prevention, connectedTo, Crime Data Analysis>
+<Behavioral Science in Prevention, connectedTo, Drug Prevention Initiatives>
+<Behavioral Science in Prevention, connectedTo, Identity Theft Prevention>
+<Behavioral Science in Prevention, connectedTo, Target Hardening>
+<Community Policing, connectedTo, Public Awareness Campaigns>
+<Conflict Resolution Training, connectedTo, Drug Prevention Initiatives>
+<Conflict Resolution Training, connectedTo, Hotspot Policing>
+<Conflict Resolution Training, connectedTo, Neighborhood Watch Programs>
+<Conflict Resolution Training, connectedTo, Public Awareness Campaigns>
+<Conflict Resolution Training, connectedTo, Restorative Justice>
+<Conflict Resolution Training, connectedTo, Target Hardening>
+<Crime Data Analysis, connectedTo, Conflict Resolution Training>
+<Crime Data Analysis, connectedTo, Drug Prevention Initiatives>
+<Crime Data Analysis, connectedTo, Reintegration Programs>
+<Crime Data Analysis, connectedTo, Target Hardening>
+<Cybercrime Prevention, connectedTo, Community Policing>
+<Domestic Violence Prevention, connectedTo, Sexual Assault Prevention>
+<Domestic Violence Prevention, partOf, Domestic Violence Prevention>
+<Drug Prevention Initiatives, connectedTo, Neighborhood Watch Programs>
+<Early Intervention Programs, connectedTo, Drug Prevention Initiatives>
+<Early Intervention Programs, connectedTo, Restorative Justice>
+<Environmental Design, connectedTo, Early Intervention Programs>
+<Gang Intervention, connectedTo, Behavioral Science in Prevention>
+<Hotspot Policing, connectedTo, Identity Theft Prevention>
+<Law Enforcement Training, connectedTo, School Safety Programs>
+<Law Enforcement Training, partOf, Law Enforcement Training>
+<Mediation Services, connectedTo, Identity Theft Prevention>
+<Mediation Services, partOf, Mediation Services>
+<Neighborhood Watch Programs, connectedTo, Vehicle Theft Prevention>
+<Patrol Operations, connectedTo, Early Intervention Programs>
+<Patrol Operations, partOf, Patrol Operations>
+<Public Awareness Campaigns, connectedTo, Identity Theft Prevention>
+<Public Awareness Campaigns, connectedTo, Robbery Prevention>
+<Reintegration Programs, connectedTo, Law Enforcement Training>
+<Reintegration Programs, partOf, Reintegration Programs>
+<Restorative Justice, connectedTo, Drug Prevention Initiatives>
+<Robbery Prevention, connectedTo, Hotspot Policing>
+<School Safety Programs, connectedTo, Patrol Operations>
+<School Safety Programs, partOf, School Safety Programs>
+<Sexual Assault Prevention, connectedTo, Mediation Services>
+<Sexual Assault Prevention, partOf, Sexual Assault Prevention>
+<Target Hardening, connectedTo, Domestic Violence Prevention>
+<Target Hardening, connectedTo, Environmental Design>
+<Target Hardening, connectedTo, Hotspot Policing>
+<Target Hardening, connectedTo, Public Awareness Campaigns>
+<Target Hardening, connectedTo, Vehicle Theft Prevention>
+<Vehicle Theft Prevention, connectedTo, Cybercrime Prevention>
diff --git a/test/graphviz/graph_hard/graphviz_312.dot b/test/graphviz/graph_hard/graphviz_312.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1c341a45a763074a0c7caa5e11be0cf9423d5457
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_312.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=RL
+	N0 [label="Sexual Assault Prevention" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Target Hardening" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N2 [label="Community Policing" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N3 [label="Domestic Violence Prevention" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="Deterrence Strategies" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N5 [label="Gang Intervention" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N6 [label="Reintegration Programs" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N7 [label="Neighborhood Watch Programs" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N8 [label="Technology for Prevention" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N9 [label="Rehabilitation Programs" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N10 [label="Youth Programs" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N11 [label="Cybercrime Prevention" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Fraud Prevention" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Identity Theft Prevention" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+		nest0_1 [label="Data Sharing Initiatives" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest0_2 [label="Patrol Operations" color="#FFCC7A" fillcolor="#FFF6D9" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Security Lighting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Law Enforcement Training" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+		nest1_1 [label="CCTV Installation" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=communicates color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=educates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_312.txt b/test/graphviz/graph_hard/graphviz_312.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6b0dcdfb25c41442f48d1f48f0068bec39135ad
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_312.txt
@@ -0,0 +1,29 @@
+<CCTV Installation, connectedTo, Neighborhood Watch Programs>
+<CCTV Installation, partOf, CCTV Installation>
+<Community Policing, communicates, Domestic Violence Prevention>
+<Data Sharing Initiatives, connectedTo, Patrol Operations>
+<Data Sharing Initiatives, connectedTo, Rehabilitation Programs>
+<Data Sharing Initiatives, partOf, Data Sharing Initiatives>
+<Deterrence Strategies, connectedTo, Cybercrime Prevention>
+<Deterrence Strategies, connectedTo, Gang Intervention>
+<Deterrence Strategies, connectedTo, Youth Programs>
+<Domestic Violence Prevention, educates, Deterrence Strategies>
+<Gang Intervention, connectedTo, Identity Theft Prevention>
+<Gang Intervention, connectedTo, Reintegration Programs>
+<Identity Theft Prevention, connectedTo, Data Sharing Initiatives>
+<Identity Theft Prevention, connectedTo, Reintegration Programs>
+<Identity Theft Prevention, partOf, Identity Theft Prevention>
+<Law Enforcement Training, connectedTo, CCTV Installation>
+<Law Enforcement Training, partOf, Law Enforcement Training>
+<Neighborhood Watch Programs, connectedTo, Law Enforcement Training>
+<Neighborhood Watch Programs, connectedTo, Technology for Prevention>
+<Patrol Operations, connectedTo, Reintegration Programs>
+<Patrol Operations, partOf, Patrol Operations>
+<Rehabilitation Programs, connectedTo, Youth Programs>
+<Reintegration Programs, connectedTo, Neighborhood Watch Programs>
+<Sexual Assault Prevention, connectedTo, Deterrence Strategies>
+<Sexual Assault Prevention, connectedTo, Target Hardening>
+<Sexual Assault Prevention, connectedTo, Technology for Prevention>
+<Target Hardening, connectedTo, Community Policing>
+<Technology for Prevention, connectedTo, Rehabilitation Programs>
+<Youth Programs, connectedTo, Cybercrime Prevention>
diff --git a/test/graphviz/graph_hard/graphviz_314.dot b/test/graphviz/graph_hard/graphviz_314.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9099ccf601ad47d67c27c77c329d627c5d92aa3b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_314.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Carbon Sequestration in Habitats" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Wildlife Rescue and Rehabilitation" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N2 [label="Marine Conservation" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+	N3 [label="Fundraising for Conservation" color="#4285F4" fillcolor="#D0E0F8" shape=parallelogram style=filled]
+	N4 [label="Species Monitoring" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N5 [label="Data Management for Conservation" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N6 [label="Genetic Diversity Analysis" color="#4285F4" fillcolor="#D0E0F8" shape=folder style=filled]
+	N7 [label="Community Engagement" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N8 [label="Rewilding Initiatives" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N9 [label="Ecological Survey" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N10 [label="Invasive Species Control" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+	N11 [label="Remote Sensing for Conservation" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N12 [label="Ecosystem Services Valuation" color="#4285F4" fillcolor="#D0E0F8" shape=octagon style=filled]
+	N13 [label="Wetland Restoration" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N14 [label="Reintroduction Programs" color="#4285F4" fillcolor="#D0E0F8" shape=folder style=filled]
+	N15 [label="Conservation Education" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	S0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Anti_Poaching Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Satellite Tracking of Animals" color="#9C27B0" fillcolor="#E1BEE7" shape=plaintext style=filled]
+		nest0_1 [label="Human_Wildlife Conflict Mitigation" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_2 [label="Freshwater Conservation" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Grassland Conservation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Pollution Impact Assessment" color="#4285F4" fillcolor="#D0E0F8" shape=Mdiamond style=filled]
+		nest1_1 [label="Translocation of Species" color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+		nest1_2 [label="Law Enforcement" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest1_3 [label="Sustainable Resource Management" color="#9C27B0" fillcolor="#E1BEE7" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=sustainable_uses color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=community_engages color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest0_0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N8 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N12 -> S0 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=studies color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [label=manages color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_317.txt b/test/graphviz/graph_hard/graphviz_317.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ad655235c0b81cf71d269795edef744331769891
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_317.txt
@@ -0,0 +1,38 @@
+<Acoustic Oceanography, connectedTo, Marine Biodiversity Assessment>
+<Biological Oceanography, connectedTo, Seabed Resource Exploration>
+<Data Visualization, connectedTo, Deep_Sea Exploration>
+<Data Visualization, partOf, Data Visualization>
+<Deep_Sea Exploration, connectedTo, Physical Oceanography>
+<Deep_Sea Exploration, partOf, Deep_Sea Exploration>
+<Fisheries Management, connectedTo, Biological Oceanography>
+<Fisheries Management, connectedTo, Marine Geology>
+<Fisheries Management, connectedTo, Ocean Renewable Energy>
+<Fisheries Management, connectedTo, Polar Oceanography>
+<Marine Geology, connectedTo, Biological Oceanography>
+<Marine Pollution Monitoring, connectedTo, Polar Oceanography>
+<Marine Pollution Monitoring, researches, Ocean Drilling Programs>
+<Marine Protected Area Planning, connectedTo, Acoustic Oceanography>
+<Marine Protected Area Planning, connectedTo, Marine Pollution Monitoring>
+<Marine Protected Area Planning, connectedTo, Ocean Drilling Programs>
+<Marine Protected Area Planning, connectedTo, Polar Oceanography>
+<Marine Protected Area Planning, simulates, Marine Remote Sensing>
+<Marine Remote Sensing, connectedTo, Ocean Temperature Sensing>
+<Marine Remote Sensing, connectedTo, Polar Oceanography>
+<Ocean Acidification Research, connectedTo, Marine Remote Sensing>
+<Ocean Drilling Programs, connectedTo, Marine Geology>
+<Ocean Drilling Programs, ecosystems, Plastic Pollution Research>
+<Ocean Renewable Energy, connectedTo, Marine Geology>
+<Ocean Renewable Energy, connectedTo, Marine Protected Area Planning>
+<Ocean Temperature Sensing, connectedTo, ROV or AUV Operations>
+<Ocean Temperature Sensing, partOf, Ocean Temperature Sensing>
+<Physical Oceanography, connectedTo, Seabed Resource Exploration>
+<Physical Oceanography, partOf, Physical Oceanography>
+<Plastic Pollution Research, connectedTo, Acoustic Oceanography>
+<Plastic Pollution Research, connectedTo, Biological Oceanography>
+<Plastic Pollution Research, connectedTo, Data Visualization>
+<Plastic Pollution Research, connectedTo, Ocean Acidification Research>
+<Plastic Pollution Research, connectedTo, Polar Oceanography>
+<Polar Oceanography, connectedTo, Marine Geology>
+<ROV or AUV Operations, connectedTo, Biological Oceanography>
+<ROV or AUV Operations, partOf, ROV or AUV Operations>
+<Seabed Resource Exploration, connectedTo, Acoustic Oceanography>
diff --git a/test/graphviz/graph_hard/graphviz_319.dot b/test/graphviz/graph_hard/graphviz_319.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d27f426ee512071e845cc599a54b8bfbdf3eae0d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_319.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=TD
+	N0 [label="Subsurface Imaging" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Computational Seismology" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N2 [label="Nuclear Test Monitoring" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N3 [label="Epicenter Location" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Seismic Instrumentation Maintenance" color="#42A5F5" fillcolor="#F1F8FF" shape=parallelogram style=filled]
+	N5 [label="Geophysical Exploration" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N6 [label="Seismic Risk Mitigation" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N7 [label="Liquefaction Potential Assessment" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N8 [label="Emergency Preparedness for Earthquakes" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N9 [label="Volcanic Seismology" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N10 [label="Ground Motion Prediction" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N11 [label="Structural Response to Earthquakes" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N12 [label="Tectonic Plate Movement Monitoring" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N13 [label="Fault Line Mapping" color="#26A69A" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N14 [label="Magnitude Determination" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N15 [label="Seismic Network Operations" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Deep Earth Seismology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Seismic Wave Analysis" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest0_1 [label="Tectonic Stress Measurement" color="#7E57C2" fillcolor="#EDE7F6" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [label=analyzes color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label=Paleoseismology labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Earth Structure Imaging" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_1 [label="Earthquake Detection" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=simulates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=receives color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N11 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N11 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [label=volcanic_activity color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_32.txt b/test/graphviz/graph_hard/graphviz_32.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f22df7f630b83a20f64bfa2accf24c8461ec587b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_32.txt
@@ -0,0 +1,32 @@
+<Automated Milking, connectedTo, Yield Prediction>
+<Barn Cleaning, connectedTo, Equipment Repair>
+<Crop Rotation Planning, connectedTo, Farm Machinery Operation>
+<Crop Rotation Planning, partOf, Crop Rotation Planning>
+<Drone Scouting, connectedTo, Farm Machinery Operation>
+<Drone Scouting, connectedTo, Traceability System>
+<Drone Scouting, connectedTo, Weather Tracking>
+<Equipment Repair, connectedTo, Farm Machinery Operation>
+<Equipment Repair, connectedTo, Food Processing>
+<Equipment Repair, connectedTo, Grain Drying>
+<Farm Machinery Operation, connectedTo, Food Processing>
+<Farm Machinery Operation, connectedTo, Supply Chain to Retailers>
+<Farm Maintenance, connectedTo, Farm Machinery Operation>
+<Fencing Installation, connectedTo, Barn Cleaning>
+<Grain Drying, connectedTo, Farm Machinery Operation>
+<Grain Drying, connectedTo, Farm Maintenance>
+<Grain Drying, connectedTo, Food Processing>
+<Greenhouse Control, connectedTo, Barn Cleaning>
+<Greenhouse Control, partOf, Greenhouse Control>
+<Harvesting, connectedTo, Fencing Installation>
+<Hydroponic System Management, connectedTo, Greenhouse Control>
+<Hydroponic System Management, partOf, Hydroponic System Management>
+<Organic Certification, connectedTo, Subsidy Application>
+<Subsidy Application, rotates, Drone Scouting>
+<Supply Chain to Retailers, connectedTo, Water Level Measurement>
+<Supply Chain to Retailers, partOf, Supply Chain to Retailers>
+<Traceability System, connectedTo, Hydroponic System Management>
+<Traceability System, partOf, Traceability System>
+<Water Level Measurement, connectedTo, Crop Rotation Planning>
+<Water Level Measurement, partOf, Water Level Measurement>
+<Weather Tracking, sustains, Harvesting>
+<Yield Prediction, connectedTo, Organic Certification>
diff --git a/test/graphviz/graph_hard/graphviz_320.txt b/test/graphviz/graph_hard/graphviz_320.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bd221a981a78dc84cab8182cd3951219f695168e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_320.txt
@@ -0,0 +1,41 @@
+<Computational Seismology, connectedTo, Fault Line Mapping>
+<Computational Seismology, connectedTo, Structural Response to Earthquakes>
+<Data Archiving and Distribution, connectedTo, P_Wave or S_Wave Distinction>
+<Data Archiving and Distribution, partOf, Data Archiving and Distribution>
+<Earthquake Detection, connectedTo, Seismic Hazard Assessment>
+<Earthquake Detection, connectedTo, Tsunami Warning Systems>
+<Earthquake Prediction Research, connectedTo, Paleoseismology>
+<Fault Line Mapping, connectedTo, Glacial Seismology>
+<Fault Line Mapping, partOf, Fault Line Mapping>
+<Geophysical Exploration, connectedTo, Magnitude Determination>
+<Geophysical Exploration, partOf, Geophysical Exploration>
+<Glacial Seismology, connectedTo, Seismic Hazard Assessment>
+<Glacial Seismology, partOf, Glacial Seismology>
+<Ground Motion Prediction, connectedTo, Earthquake Prediction Research>
+<Ground Motion Prediction, connectedTo, Magnitude Determination>
+<Ground Motion Prediction, connectedTo, Structural Response to Earthquakes>
+<Ground Motion Prediction, connectedTo, Tsunami Warning Systems>
+<Ground Motion Prediction, models, Computational Seismology>
+<Induced Seismicity Monitoring, connectedTo, Strong Motion Instrumentation>
+<Induced Seismicity Monitoring, connectedTo, Tsunami Warning Systems>
+<Liquefaction Potential Assessment, connectedTo, Seismic Wave Analysis>
+<Magnitude Determination, connectedTo, Data Archiving and Distribution>
+<Magnitude Determination, connectedTo, Liquefaction Potential Assessment>
+<P_Wave or S_Wave Distinction, connectedTo, Geophysical Exploration>
+<P_Wave or S_Wave Distinction, partOf, P_Wave or S_Wave Distinction>
+<Seismic Hazard Assessment, connectedTo, Ground Motion Prediction>
+<Seismic Instrumentation Maintenance, connectedTo, Induced Seismicity Monitoring>
+<Seismic Instrumentation Maintenance, connectedTo, Liquefaction Potential Assessment>
+<Seismic Instrumentation Maintenance, connectedTo, Paleoseismology>
+<Seismic Network Operations, connectedTo, Paleoseismology>
+<Seismic Network Operations, connectedTo, Tectonic Stress Measurement>
+<Seismic Network Operations, connectedTo, Tsunami Warning Systems>
+<Seismic Wave Analysis, connectedTo, Earthquake Prediction Research>
+<Seismic Wave Analysis, connectedTo, Paleoseismology>
+<Seismic Wave Analysis, connectedTo, Tsunami Warning Systems>
+<Strong Motion Instrumentation, connectedTo, Earthquake Detection>
+<Strong Motion Instrumentation, connectedTo, Paleoseismology>
+<Structural Response to Earthquakes, connectedTo, Liquefaction Potential Assessment>
+<Structural Response to Earthquakes, connectedTo, Magnitude Determination>
+<Tectonic Stress Measurement, connectedTo, Seismic Instrumentation Maintenance>
+<Tsunami Warning Systems, connectedTo, Earthquake Prediction Research>
diff --git a/test/graphviz/graph_hard/graphviz_321.txt b/test/graphviz/graph_hard/graphviz_321.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce7e25609a261d7bf531b7ee7ed066e707561d39
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_321.txt
@@ -0,0 +1,43 @@
+<Computational Seismology, connectedTo, Ground Motion Prediction>
+<Deep Earth Seismology, connectedTo, Tectonic Stress Measurement>
+<Deep Earth Seismology, partOf, Deep Earth Seismology>
+<Earth Structure Imaging, connectedTo, Structural Response to Earthquakes>
+<Earthquake Detection, connectedTo, Emergency Preparedness for Earthquakes>
+<Earthquake Detection, partOf, Earthquake Detection>
+<Emergency Preparedness for Earthquakes, partOf, Emergency Preparedness for Earthquakes>
+<Emergency Preparedness for Earthquakes, responds, Seismic Instrumentation Maintenance>
+<Epicenter Location, connectedTo, Earthquake Detection>
+<Epicenter Location, partOf, Epicenter Location>
+<Glacial Seismology, connectedTo, Earth Structure Imaging>
+<Glacial Seismology, connectedTo, Planetary Seismology>
+<Glacial Seismology, connectedTo, Tsunami Warning Systems>
+<Ground Motion Prediction, connectedTo, Geophysical Exploration>
+<Induced Seismicity Monitoring, connectedTo, Computational Seismology>
+<Induced Seismicity Monitoring, connectedTo, Earth Structure Imaging>
+<Induced Seismicity Monitoring, connectedTo, Ground Motion Prediction>
+<Induced Seismicity Monitoring, connectedTo, Nuclear Test Monitoring>
+<Magnitude Determination, connectedTo, Tectonic Plate Movement Monitoring>
+<Nuclear Test Monitoring, connectedTo, Earth Structure Imaging>
+<Nuclear Test Monitoring, connectedTo, Glacial Seismology>
+<Paleoseismology, connectedTo, Earth Structure Imaging>
+<Paleoseismology, connectedTo, Induced Seismicity Monitoring>
+<Paleoseismology, connectedTo, Seismic Noise Analysis>
+<Planetary Seismology, connectedTo, Earth Structure Imaging>
+<Seismic Instrumentation Maintenance, connectedTo, Computational Seismology>
+<Seismic Instrumentation Maintenance, connectedTo, Geophysical Exploration>
+<Seismic Instrumentation Maintenance, connectedTo, Ground Motion Prediction>
+<Seismic Noise Analysis, connectedTo, Epicenter Location>
+<Seismic Noise Analysis, connectedTo, Induced Seismicity Monitoring>
+<Seismic Noise Analysis, connectedTo, Subsurface Imaging>
+<Seismic Tomography, connectedTo, Deep Earth Seismology>
+<Seismic Tomography, partOf, Seismic Tomography>
+<Structural Response to Earthquakes, connectedTo, Magnitude Determination>
+<Subsurface Imaging, connectedTo, Induced Seismicity Monitoring>
+<Tectonic Plate Movement Monitoring, connectedTo, Computational Seismology>
+<Tectonic Plate Movement Monitoring, connectedTo, Geophysical Exploration>
+<Tectonic Plate Movement Monitoring, connectedTo, Ground Motion Prediction>
+<Tectonic Plate Movement Monitoring, connectedTo, Seismic Instrumentation Maintenance>
+<Tectonic Stress Measurement, connectedTo, Earth Structure Imaging>
+<Tectonic Stress Measurement, partOf, Tectonic Stress Measurement>
+<Tsunami Warning Systems, connectedTo, Seismic Tomography>
+<Tsunami Warning Systems, partOf, Tsunami Warning Systems>
diff --git a/test/graphviz/graph_hard/graphviz_322.dot b/test/graphviz/graph_hard/graphviz_322.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b88c7ac8d75290e8b0345f174a0b732187b54065
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_322.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=TD
+	N0 [label="Next_Generation Sequencing" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Genomic Editing" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N2 [label="Personalized Medicine" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N3 [label="Genome_Wide Association Studies" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N4 [label="Spatial Genomics" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N5 [label=Metabolomics color="#90A4AE" fillcolor="#ECEFF1" shape=Mdiamond style=filled]
+	N6 [label="Computational Genomics" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+	N7 [label="Methylation Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N8 [label="Disease Gene Identification" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N9 [label="Structural Genomics" color="#90A4AE" fillcolor="#ECEFF1" shape=plaintext style=filled]
+	N10 [label=Epigenomics color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N11 [label=Transcriptomics color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="DNA Sequencing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Genomic Data Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_1 [label="Genomic Data Sharing" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+		nest0_2 [label="Single_Cell Genomics" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Data Privacy in Genomics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Biomarker Discovery" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest1_1 [label="Variant Calling" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+		nest1_2 [label="Cloning Technologies" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+		nest1_3 [label="Functional Genomics" color="#90A4AE" fillcolor="#ECEFF1" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_0 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=diagnoses color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N7 [label=privacy_protects color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label=maps color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_323.dot b/test/graphviz/graph_hard/graphviz_323.dot
new file mode 100644
index 0000000000000000000000000000000000000000..01be8f6ed00a6dac570b9fe55a56359083160d94
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_323.dot
@@ -0,0 +1,89 @@
+digraph {
+	rankdir=LR
+	N0 [label=Proteomics color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Genome Assembly" color="#FFF9AE" fillcolor="#FFFCE6" shape=oval style=filled]
+	N2 [label=Pharmacogenomics color="#FFF9AE" fillcolor="#FFFCE6" shape=Mdiamond style=filled]
+	N3 [label="Gene Expression Profiling" color="#FF5722" fillcolor="#FFCCBC" shape=plaintext style=filled]
+	N4 [label="Genomic Data Visualization" color="#C0CA33" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N5 [label="Spatial Genomics" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N6 [label="DNA Sequencing" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N7 [label="Synthetic Genomics" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N8 [label="Gene Therapy Development" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N9 [label=Epigenomics color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N10 [label="Gene Annotation" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N11 [label="Methylation Analysis" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N12 [label="Genomic Editing" color="#FFF9AE" fillcolor="#FFFCE6" shape=Mdiamond style=filled]
+	N13 [label="Comparative Genomics" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N14 [label="Data Privacy in Genomics" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+	N15 [label="Population Genomics" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N16 [label=Transcriptomics color="#FF5722" fillcolor="#FFCCBC" shape=Mdiamond style=filled]
+	N17 [label="Genetic Counseling" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+	N18 [label=Metabolomics color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N19 [label="Personalized Medicine" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	S0 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#C0CA33" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Structural Genomics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Genomic Data Sharing" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest0_1 [label="Genome_Wide Association Studies" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Long_Read Sequencing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Bioinformatics Pipeline Development" color="#C0CA33" fillcolor="#F9FBE7" shape=octagon style=filled]
+		nest1_1 [label="Biomarker Discovery" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+		nest1_2 [label="Rare Disease Genomics" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=compares color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=accesses_data color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N18 -> nest0_0 [label=genes_studies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N15 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N13 [label=licenses color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S0 -> N19 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N18 [color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [label=predicts color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_325.dot b/test/graphviz/graph_hard/graphviz_325.dot
new file mode 100644
index 0000000000000000000000000000000000000000..70f41582822702c10dee1c030fa486f9b953997c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_325.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Legal Transcription" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Contextual Understanding" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+	N2 [label="Medical Transcription" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+	N3 [label="Meeting Transcription" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N4 [label="Voice Assistant Development" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N5 [label="Dialect Adaptation" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+	N6 [label="Multimodal Speech Processing" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N7 [label="Phonetic Transcription" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N8 [label="Disordered Speech Recognition" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N9 [label="Voice User Interface Design" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Feature Extraction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Speech Analytics" color="#8C9EFF" fillcolor="#D3D7EB" shape=hexagon style=filled]
+		nest0_1 [label="Speech Emotion Recognition" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+		nest0_2 [label="Noise Reduction" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest0_3 [label="Robust Speech Recognition" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Emotion Recognition from Voice" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Children's Speech Recognition" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+		nest1_1 [label="Speech_to_Text Conversion" color="#F44336" fillcolor="#FFCDD2" shape=folder style=filled]
+		nest1_2 [label="Accent Recognition" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=builds color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=tests color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=designs color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_326.dot b/test/graphviz/graph_hard/graphviz_326.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c21aed1e0d591c04d69d5f7d249440c4c0bd1f57
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_326.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=BT
+	N0 [label="Natural Language Understanding" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Automatic Speech Recognition" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N2 [label="Emotion Recognition from Voice" color="#94C0C0" fillcolor="#CADEDE" shape=Mdiamond style=filled]
+	N3 [label="Speaker Identification" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N4 [label="Cloud_based Speech Services" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N5 [label="Call Center Automation" color="#90A4AE" fillcolor="#ECEFF1" shape=parallelogram style=filled]
+	N6 [label="Accent Recognition" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N7 [label="Voice Search Optimization" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="Noise Reduction" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N9 [label="Acoustic Modeling" color="#4CAF50" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N10 [label="Cross_Lingual Speech Recognition" color="#90A4AE" fillcolor="#ECEFF1" shape=Mdiamond style=filled]
+	N11 [label="Speech_to_Text Conversion" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Text_to_Speech Synthesis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Meeting Transcription" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+		nest0_1 [label="Keyword Spotting" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+		nest0_2 [label="Language Modeling" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+		nest0_3 [label="Speaker Diarization" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Linguistic Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Disordered Speech Recognition" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+		nest1_1 [label="Dialect Adaptation" color="#94C0C0" fillcolor="#CADEDE" shape=parallelogram style=filled]
+		nest1_2 [label="Robust Speech Recognition" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=builds color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [label=transcribes color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label=converts color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=outputs color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_327.dot b/test/graphviz/graph_hard/graphviz_327.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9c0ceffbc29af6fda52b8f156877f0d034a1dbe7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_327.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=LR
+	N0 [label="Robust Speech Recognition" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="Dialect Adaptation" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N2 [label="Disordered Speech Recognition" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N3 [label="Real_Time Captioning" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N4 [label="Contextual Understanding" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N5 [label="Speech Emotion Recognition" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N6 [label="Text_to_Speech Synthesis" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N7 [label="Meeting Transcription" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N8 [label="Command and Control" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N9 [label="Voice User Interface Design" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Embedded Speech Recognition" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Noise Reduction" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+		nest0_1 [label="Acoustic Modeling" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Voice Biometrics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Voice Activity Detection" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest1_1 [label="Children's Speech Recognition" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+		nest1_2 [label="Medical Transcription" color="#AF56A6" fillcolor="#DDCEDD" shape=folder style=filled]
+		nest1_3 [label="Multimodal Speech Processing" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=sells color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label=evaluates color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_328.dot b/test/graphviz/graph_hard/graphviz_328.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2fe539ff326697ce3e19e516ea35bee70df509fd
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_328.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=TD
+	N0 [label="Spam Detection" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Text Preprocessing" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N2 [label="Automated Content Tagging" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N3 [label="Concept Extraction" color="#FFF9AE" fillcolor="#FFFCE6" shape=oval style=filled]
+	N4 [label="Author Attribution" color="#FFF9AE" fillcolor="#FFFCE6" shape=oval style=filled]
+	N5 [label="Corpus Creation" color="#90A4AE" fillcolor="#ECEFF1" shape=oval style=filled]
+	N6 [label=Tokenization color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N7 [label="Natural Language Processing" color="#FFF9AE" fillcolor="#FFFCE6" shape=plaintext style=filled]
+	N8 [label="News Article Analysis" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N9 [label="Text Classification" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N10 [label="Resume Parsing" color="#90A4AE" fillcolor="#ECEFF1" shape=oval style=filled]
+	N11 [label="Opinion Mining" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N12 [label="Information Extraction" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N13 [label="Named Entity Recognition" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+	N14 [label="Language Translation for Text Mining" color="#FFF9AE" fillcolor="#FFFCE6" shape=plaintext style=filled]
+	N15 [label="Plagiarism Detection" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N16 [label="Data Cleaning for Text" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N17 [label="Relationship Extraction" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Topic Modeling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Text Similarity Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+		nest0_1 [label="Regular Expressions for Text" color="#90A4AE" fillcolor="#ECEFF1" shape=octagon style=filled]
+		nest0_2 [label="Financial Text Analysis" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [label=secures color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Chatbot Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Annotation Tools" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest1_1 [label="Vector Space Models" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+		nest1_2 [label="Deep Learning for NLP" color="#FF5722" fillcolor="#FFCCBC" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=builds_tools color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=sentiments color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=researches color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [label=topics color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [label=filters color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N12 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_329.dot b/test/graphviz/graph_hard/graphviz_329.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b498630096951b5baa3c224817e290b5a4c1b328
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_329.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Text Clustering" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Information Extraction" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N2 [label="Regular Expressions for Text" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N3 [label="Resume Parsing" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N4 [label="Concept Extraction" color="#FFE470" fillcolor="#FFFAE0" shape=hexagon style=filled]
+	N5 [label="Named Entity Recognition" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N6 [label="Opinion Mining" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N7 [label="Text Similarity Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+	N8 [label="Topic Modeling" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N9 [label="Text Visualization" color="#FFE470" fillcolor="#FFFAE0" shape=box style=filled]
+	N10 [label="Knowledge Graph Construction" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N11 [label="Sentiment Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N12 [label="Plagiarism Detection" color="#FF9800" fillcolor="#FFE0B2" shape=octagon style=filled]
+	N13 [label="Author Attribution" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N14 [label="Annotation Tools" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N15 [label="Customer Feedback Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=octagon style=filled]
+	N16 [label="Legal Document Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=octagon style=filled]
+	N17 [label="Part_of_Speech Tagging" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S1 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFE470" fillcolor="#FFFAE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Corpus Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Relationship Extraction" color="#CDDC39" fillcolor="#E6EE9C" shape=folder style=filled]
+		nest0_1 [label="Vector Space Models" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_2 [label="Document Summarization" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+		nest0_3 [label="Spam Detection" color="#FFE470" fillcolor="#FFFAE0" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=transforms_data color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Deep Learning for NLP" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="News Article Analysis" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest1_1 [label="Data Cleaning for Text" color="#CDDC39" fillcolor="#E6EE9C" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=builds_tools color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=keywords color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=interprets color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [label=extracts color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N14 -> nest0_0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N10 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest1_0 [label=trends color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N15 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N12 -> S1 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> S2 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	S2 -> N17 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [label=predicts color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_33.dot b/test/graphviz/graph_hard/graphviz_33.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2d70797072754031fdec6bde511355ca507736a9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_33.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=LR
+	N0 [label="Automated Milking" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Supply Chain to Retailers" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N2 [label="Food Processing" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N3 [label="Equipment Repair" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N4 [label="Disease Detection" color="#AB47BC" fillcolor="#F3E5F5" shape=oval style=filled]
+	N5 [label="Farm Maintenance" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N6 [label="Seedling Transplanting" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N7 [label="Crop Monitoring" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N8 [label="Produce Sorting" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N9 [label="Fertilizer Application" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Fencing Installation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Precision Farming" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_1 [label="Water Level Measurement" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Market Transportation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Animal Health Monitoring" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_1 [label="Pest Spraying" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N4 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_330.dot b/test/graphviz/graph_hard/graphviz_330.dot
new file mode 100644
index 0000000000000000000000000000000000000000..97323ba2bcedfb139cde1dbd5f263046dedeb722
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_330.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=LR
+	N0 [label="Author Attribution" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Data Cleaning for Text" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N2 [label="Deep Learning for NLP" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N3 [label="Document Summarization" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N4 [label="Lemmatization or Stemming" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N5 [label="News Article Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=folder style=filled]
+	N6 [label="Sentiment Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N7 [label="Concept Extraction" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N8 [label="Opinion Mining" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N9 [label="Text Visualization" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N10 [label="Relationship Extraction" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Resume Parsing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Natural Language Processing" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+		nest0_1 [label="Annotation Tools" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Keyword Extraction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Knowledge Graph Construction" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+		nest1_1 [label="Legal Document Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=folder style=filled]
+		nest1_0 -> nest1_1 [label=interprets color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=trends color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N10 [label=complies color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_331.dot b/test/graphviz/graph_hard/graphviz_331.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c5230bd079cc4d4c0ef31608fcacef94d2735b37
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_331.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Virtual Reality Interaction" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label="Real_Time Data Streaming" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N2 [label="Model Creation" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N3 [label="System Integration Architecture" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N4 [label="Remote Control Capabilities" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N5 [label="Enterprise Asset Management Integration" color="#DCE775" fillcolor="#FCFCE7" shape=Mdiamond style=filled]
+	N6 [label="Sensor Data Integration" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N7 [label="IoT Data Ingestion" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N8 [label="Aerospace Digital Twins" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N9 [label="Risk Assessment" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Augmented Reality Visualization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Digital Twin Lifecycle Management" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_1 [label="Edge Computing for Twins" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_2 [label="Anomaly Detection" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="What_If Scenario Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Simulation and Prediction" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_1 [label="Design Validation" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+		nest1_2 [label="Data Security for Digital Twins" color="#5C6BC0" fillcolor="#E8EAF6" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=governs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N7 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N4 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label=troubleshoots color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [label=deploys color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [label=designs color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_332.dot b/test/graphviz/graph_hard/graphviz_332.dot
new file mode 100644
index 0000000000000000000000000000000000000000..74371197ce06cbaab32691e4e2969149e2f1c870
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_332.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=TD
+	N0 [label="Interoperability Standards" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N1 [label="Digital Twin Lifecycle Management" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N2 [label="Sensor Data Integration" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N3 [label="Remote Control Capabilities" color="#FFCC7A" fillcolor="#FFF6D9" shape=plaintext style=filled]
+	N4 [label="Energy Consumption Optimization" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N5 [label="Asset Optimization" color="#00BCD4" fillcolor="#B2EBF2" shape=plaintext style=filled]
+	N6 [label="AI or ML Model Integration" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	N7 [label="IoT Data Ingestion" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N8 [label="Risk Assessment" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N9 [label="Maintenance Scheduling" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+	N10 [label="Smart Manufacturing" color="#A1887F" fillcolor="#EFEBE9" shape=parallelogram style=filled]
+	N11 [label="System Integration Architecture" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N12 [label="Building Information Modeling Integration" color="#FFCC7A" fillcolor="#FFF6D9" shape=plaintext style=filled]
+	N13 [label="Virtual Reality Interaction" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N14 [label="Cyber_Physical Systems" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Predictive Maintenance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Model Creation" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+		nest0_1 [label="Enterprise Asset Management Integration" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+		nest0_2 [label="Smart City Planning" color="#A1887F" fillcolor="#EFEBE9" shape=Mdiamond style=filled]
+		nest0_3 [label="Condition Monitoring" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Performance Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="What_If Scenario Analysis" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest1_1 [label="Augmented Reality Visualization" color="#A1887F" fillcolor="#EFEBE9" shape=folder style=filled]
+		nest1_2 [label="Historical Data Analysis" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N6 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label="AR or VR_enables" color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest0_0 -> N7 [label=risks_mitigates color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_333.txt b/test/graphviz/graph_hard/graphviz_333.txt
new file mode 100644
index 0000000000000000000000000000000000000000..33e161f7e4e40cb8ba67638ebe7620b0ec456222
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_333.txt
@@ -0,0 +1,32 @@
+<Aerospace Digital Twins, connectedTo, Model Creation>
+<Asset Optimization, connectedTo, IoT Data Ingestion>
+<Augmented Reality Visualization, upgrades, Data Security for Digital Twins>
+<Data Security for Digital Twins, connectedTo, Lifecycle Management>
+<Digital Twin Lifecycle Management, deploys, Operational Planning>
+<Digital Twin Lifecycle Management, partOf, Digital Twin Lifecycle Management>
+<Interoperability Standards, connectedTo, Real_Time Data Streaming>
+<Interoperability Standards, connectedTo, Smart City Planning>
+<IoT Data Ingestion, connectedTo, Simulation Platform Development>
+<IoT Data Ingestion, connectedTo, Virtual Prototyping>
+<Maintenance Scheduling, partOf, Maintenance Scheduling>
+<Maintenance Scheduling, performance_tracks, Scalability of Models>
+<Model Creation, connectedTo, Virtual Reality Interaction>
+<Operational Planning, connectedTo, Augmented Reality Visualization>
+<Real_Time Data Streaming, connectedTo, Aerospace Digital Twins>
+<Real_Time Data Streaming, troubleshoots, Sensor Data Integration>
+<Scalability of Models, connectedTo, Digital Twin Lifecycle Management>
+<Scalability of Models, partOf, Scalability of Models>
+<Sensor Data Integration, connectedTo, Asset Optimization>
+<Sensor Data Integration, connectedTo, Data Security for Digital Twins>
+<Sensor Data Integration, connectedTo, Smart City Planning>
+<Sensor Data Integration, connectedTo, What_If Scenario Analysis>
+<Simulation Platform Development, connectedTo, Smart Manufacturing>
+<Simulation Platform Development, partOf, Simulation Platform Development>
+<Smart City Planning, connectedTo, Aerospace Digital Twins>
+<Smart City Planning, connectedTo, Asset Optimization>
+<Smart Manufacturing, connectedTo, IoT Data Ingestion>
+<Smart Manufacturing, partOf, Smart Manufacturing>
+<Virtual Prototyping, connectedTo, Aerospace Digital Twins>
+<Virtual Prototyping, connectedTo, Maintenance Scheduling>
+<Virtual Reality Interaction, connectedTo, Operational Planning>
+<What_If Scenario Analysis, connectedTo, Smart City Planning>
diff --git a/test/graphviz/graph_hard/graphviz_334.dot b/test/graphviz/graph_hard/graphviz_334.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8651193906608457a84f0c5d3ceeab3d52d93b8d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_334.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=RL
+	N0 [label="Report Generation Automation" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Workflow Automation Platforms" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N2 [label="API Automation" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N3 [label="Finance Process Automation" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N4 [label="Compliance in Automation" color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+	N5 [label="Optical Character Recognition for Automation" color="#A188D0" fillcolor="#DACBE3" shape=folder style=filled]
+	N6 [label="Process Mining" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N7 [label="Supply Chain Automation" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N8 [label="Intelligent Automation" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+	N9 [label="Integration with Existing Systems" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N10 [label="Audit Trail for Automation" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N11 [label="Automated Testing" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N12 [label="Scalability of Automation" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N13 [label="Low_Code or No_Code Automation" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N14 [label="Change Management for Automation" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N15 [label="Process Mapping" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N16 [label="Natural Language Processing for Automation" color="#A1D7CD" fillcolor="#EDF5F3" shape=hexagon style=filled]
+	N17 [label="IT Operations Automation" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Error Handling in Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Automated Data Validation" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+		nest0_1 [label="HR Process Automation" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Data Entry Automation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Performance Monitoring of Bots" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+		nest1_1 [label="Scripting for Automation" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+		nest1_2 [label="Security for Automation Bots" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N17 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N13 -> S1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S2 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_337.dot b/test/graphviz/graph_hard/graphviz_337.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fcc6709ad175c7dfbca98b59470ecc4af6beb93e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_337.dot
@@ -0,0 +1,88 @@
+digraph {
+	rankdir=BT
+	N0 [label="Quality Data Analysis" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N1 [label="Food Safety Quality Control" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N2 [label="Calibration of Instruments" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N3 [label="Testing Methods" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Quality Standards Development" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N5 [label="Product Testing" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N6 [label="Defect Detection" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N7 [label="Customer Feedback Analysis" color="#E57373" fillcolor="#FFEBEE" shape=oval style=filled]
+	N8 [label="Service Quality Management" color="#E57373" fillcolor="#FFEBEE" shape=diamond style=filled]
+	N9 [label="Measurement System Analysis" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N10 [label="Process Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N11 [label="Regulatory Compliance for Quality" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N12 [label="Corrective and Preventive Actions" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N13 [label=Metrology color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N14 [label="Continuous Improvement" color="#4CAF50" fillcolor="#C8E6C9" shape=folder style=filled]
+	N15 [label="Non_Conformance Management" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N16 [label="Supplier Quality Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=plaintext style=filled]
+	N17 [label="Component Inspection" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Risk_Based Quality Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Root Cause Analysis" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+		nest0_1 [label="Six Sigma Methodologies" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+		nest0_2 [label="Quality Planning" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+		nest0_3 [label="Audit Planning" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Supplier Audits" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Lean Principles in Quality" color="#4CAF50" fillcolor="#C8E6C9" shape=octagon style=filled]
+		nest1_1 [label="Quality Management Systems" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=standards_sets color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=corrective_actions_implements color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=collaborates color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=personnel_trains color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=consults color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N7 [label=non_conformances_identifies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [label=certifies color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [label=root_causes_analyzes color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N12 -> M0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=products_evaluates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_337.txt b/test/graphviz/graph_hard/graphviz_337.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c88012e5c6a2bafa29f52fd3288e6d06ca072093
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_337.txt
@@ -0,0 +1,48 @@
+<Audit Planning, non_conformances_identifies, Customer Feedback Analysis>
+<Audit Planning, partOf, Audit Planning>
+<Calibration of Instruments, connectedTo, Testing Methods>
+<Continuous Improvement, connectedTo, Non_Conformance Management>
+<Corrective and Preventive Actions, connectedTo, Continuous Improvement>
+<Corrective and Preventive Actions, connectedTo, Lean Principles in Quality>
+<Corrective and Preventive Actions, connectedTo, Metrology>
+<Customer Feedback Analysis, connectedTo, Measurement System Analysis>
+<Customer Feedback Analysis, connectedTo, Service Quality Management>
+<Defect Detection, connectedTo, Continuous Improvement>
+<Defect Detection, connectedTo, Measurement System Analysis>
+<Defect Detection, personnel_trains, Customer Feedback Analysis>
+<Food Safety Quality Control, connectedTo, Calibration of Instruments>
+<Lean Principles in Quality, connectedTo, Quality Management Systems>
+<Lean Principles in Quality, partOf, Lean Principles in Quality>
+<Measurement System Analysis, connectedTo, Process Monitoring>
+<Metrology, connectedTo, Continuous Improvement>
+<Non_Conformance Management, connectedTo, Supplier Quality Management>
+<Process Monitoring, connectedTo, Regulatory Compliance for Quality>
+<Product Testing, connectedTo, Continuous Improvement>
+<Product Testing, connectedTo, Defect Detection>
+<Product Testing, connectedTo, Service Quality Management>
+<Product Testing, connectedTo, Supplier Quality Management>
+<Product Testing, root_causes_analyzes, Measurement System Analysis>
+<Quality Data Analysis, connectedTo, Continuous Improvement>
+<Quality Data Analysis, connectedTo, Non_Conformance Management>
+<Quality Data Analysis, standards_sets, Food Safety Quality Control>
+<Quality Management Systems, connectedTo, Customer Feedback Analysis>
+<Quality Management Systems, partOf, Quality Management Systems>
+<Quality Planning, connectedTo, Audit Planning>
+<Quality Planning, partOf, Quality Planning>
+<Quality Standards Development, collaborates, Product Testing>
+<Quality Standards Development, connectedTo, Measurement System Analysis>
+<Regulatory Compliance for Quality, connectedTo, Corrective and Preventive Actions>
+<Root Cause Analysis, connectedTo, Six Sigma Methodologies>
+<Root Cause Analysis, partOf, Root Cause Analysis>
+<Service Quality Management, certifies, Regulatory Compliance for Quality>
+<Service Quality Management, connectedTo, Component Inspection>
+<Service Quality Management, connectedTo, Metrology>
+<Service Quality Management, connectedTo, Root Cause Analysis>
+<Service Quality Management, connectedTo, Supplier Quality Management>
+<Service Quality Management, consults, Measurement System Analysis>
+<Six Sigma Methodologies, connectedTo, Quality Planning>
+<Six Sigma Methodologies, partOf, Six Sigma Methodologies>
+<Supplier Quality Management, connectedTo, Component Inspection>
+<Testing Methods, connectedTo, Measurement System Analysis>
+<Testing Methods, corrective_actions_implements, Quality Standards Development>
+<Testing Methods, products_evaluates, Continuous Improvement>
diff --git a/test/graphviz/graph_hard/graphviz_339.dot b/test/graphviz/graph_hard/graphviz_339.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f399942fb7b9631a3dad2393d87fcbd7e54eecdf
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_339.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=BT
+	N0 [label="Food Safety Quality Control" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Regulatory Compliance for Quality" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N2 [label="Defect Detection" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+	N3 [label="Trend Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=octagon style=filled]
+	N4 [label="Inspection Procedures" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N5 [label="Risk_Based Quality Control" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N6 [label="Quality Management Systems" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N7 [label="Component Inspection" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N8 [label="Six Sigma Methodologies" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+	N9 [label="Process Monitoring" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N10 [label="Hardware Quality Testing" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N11 [label="Quality Planning" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N12 [label="Quality Assurance" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N13 [label="Software Quality Assurance" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N14 [label=Metrology color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N15 [label="Supplier Quality Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N16 [label="Quality Control Tools" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Lean Principles in Quality" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Audit Planning" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest0_1 [label="Quality Data Analysis" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+		nest0_2 [label="Calibration of Instruments" color="#4DB6AC" fillcolor="#E0F2F1" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Non_Destructive Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Service Quality Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+		nest1_1 [label="Measurement System Analysis" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=corrective_actions_implements color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N14 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=monitors color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=software_implements color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_339.txt b/test/graphviz/graph_hard/graphviz_339.txt
new file mode 100644
index 0000000000000000000000000000000000000000..66c3dbd8f17fecc0637275c788338cebcc9f0c50
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_339.txt
@@ -0,0 +1,40 @@
+<Audit Planning, connectedTo, Quality Data Analysis>
+<Audit Planning, partOf, Audit Planning>
+<Calibration of Instruments, connectedTo, Regulatory Compliance for Quality>
+<Calibration of Instruments, partOf, Calibration of Instruments>
+<Component Inspection, connectedTo, Process Monitoring>
+<Component Inspection, connectedTo, Six Sigma Methodologies>
+<Defect Detection, connectedTo, Audit Planning>
+<Defect Detection, connectedTo, Inspection Procedures>
+<Defect Detection, connectedTo, Trend Analysis>
+<Defect Detection, software_implements, Process Monitoring>
+<Food Safety Quality Control, connectedTo, Regulatory Compliance for Quality>
+<Hardware Quality Testing, connectedTo, Quality Planning>
+<Hardware Quality Testing, connectedTo, Service Quality Management>
+<Inspection Procedures, connectedTo, Risk_Based Quality Control>
+<Measurement System Analysis, connectedTo, Metrology>
+<Measurement System Analysis, partOf, Measurement System Analysis>
+<Metrology, connectedTo, Supplier Quality Management>
+<Process Monitoring, connectedTo, Hardware Quality Testing>
+<Quality Assurance, connectedTo, Software Quality Assurance>
+<Quality Data Analysis, connectedTo, Calibration of Instruments>
+<Quality Data Analysis, partOf, Quality Data Analysis>
+<Quality Management Systems, connectedTo, Component Inspection>
+<Quality Planning, connectedTo, Quality Assurance>
+<Regulatory Compliance for Quality, connectedTo, Inspection Procedures>
+<Regulatory Compliance for Quality, connectedTo, Process Monitoring>
+<Regulatory Compliance for Quality, connectedTo, Quality Planning>
+<Regulatory Compliance for Quality, corrective_actions_implements, Defect Detection>
+<Regulatory Compliance for Quality, monitors, Quality Management Systems>
+<Risk_Based Quality Control, connectedTo, Quality Control Tools>
+<Risk_Based Quality Control, connectedTo, Quality Management Systems>
+<Risk_Based Quality Control, connectedTo, Software Quality Assurance>
+<Service Quality Management, connectedTo, Measurement System Analysis>
+<Service Quality Management, partOf, Service Quality Management>
+<Six Sigma Methodologies, connectedTo, Process Monitoring>
+<Software Quality Assurance, connectedTo, Metrology>
+<Software Quality Assurance, connectedTo, Quality Control Tools>
+<Software Quality Assurance, connectedTo, Supplier Quality Management>
+<Supplier Quality Management, connectedTo, Quality Control Tools>
+<Trend Analysis, connectedTo, Inspection Procedures>
+<Trend Analysis, connectedTo, Quality Management Systems>
diff --git a/test/graphviz/graph_hard/graphviz_341.dot b/test/graphviz/graph_hard/graphviz_341.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a8ec7fe7a123b91e8d7333160d75978c986f2880
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_341.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=LR
+	N0 [label="Vendor Management" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Sales and Distribution" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N2 [label="Supply Chain Management" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N3 [label="Asset Management" color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N4 [label="Compliance Reporting" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N5 [label="ERP System Selection" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N6 [label="Business Process Re_engineering" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N7 [label="On_Premise ERP Solutions" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N8 [label="Master Data Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Inventory Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Integration with Other Systems" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+		nest0_1 [label="User Training" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="ERP Consulting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Customer Relationship Management" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_1 [label="User Access Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+		nest1_2 [label="Troubleshooting and Support" color="#C2B2F0" fillcolor="#EFE6FF" shape=octagon style=filled]
+		nest1_3 [label="Business Intelligence Integration" color="#81C784" fillcolor="#F1F8E9" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=customer_relations_manages color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=controls color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=on_premise_hosts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=finances_manages color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [label=protects color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [label=upgrades color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [label=consults color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N6 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_341.txt b/test/graphviz/graph_hard/graphviz_341.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d44e59a7b31bc7278ef67ff60606f2f6f8ef3e06
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_341.txt
@@ -0,0 +1,38 @@
+<Asset Management, connectedTo, Master Data Management>
+<Asset Management, connectedTo, On_Premise ERP Solutions>
+<Asset Management, controls, Compliance Reporting>
+<Business Intelligence Integration, connectedTo, Supply Chain Management>
+<Business Intelligence Integration, partOf, Business Intelligence Integration>
+<Business Process Re_engineering, connectedTo, Customer Relationship Management>
+<Business Process Re_engineering, finances_manages, On_Premise ERP Solutions>
+<Compliance Reporting, connectedTo, Business Process Re_engineering>
+<Compliance Reporting, connectedTo, On_Premise ERP Solutions>
+<Compliance Reporting, on_premise_hosts, ERP System Selection>
+<Customer Relationship Management, connectedTo, User Access Management>
+<Customer Relationship Management, partOf, Customer Relationship Management>
+<ERP System Selection, connectedTo, Business Process Re_engineering>
+<ERP System Selection, connectedTo, Master Data Management>
+<ERP System Selection, connectedTo, On_Premise ERP Solutions>
+<Integration with Other Systems, connectedTo, User Training>
+<Integration with Other Systems, partOf, Integration with Other Systems>
+<On_Premise ERP Solutions, connectedTo, Master Data Management>
+<Sales and Distribution, connectedTo, Business Process Re_engineering>
+<Sales and Distribution, connectedTo, Compliance Reporting>
+<Sales and Distribution, connectedTo, On_Premise ERP Solutions>
+<Sales and Distribution, connectedTo, Supply Chain Management>
+<Sales and Distribution, protects, Master Data Management>
+<Supply Chain Management, connectedTo, Asset Management>
+<Supply Chain Management, connectedTo, Business Process Re_engineering>
+<Supply Chain Management, connectedTo, Compliance Reporting>
+<Supply Chain Management, connectedTo, Integration with Other Systems>
+<Supply Chain Management, connectedTo, Master Data Management>
+<Supply Chain Management, connectedTo, On_Premise ERP Solutions>
+<Supply Chain Management, upgrades, On_Premise ERP Solutions>
+<Troubleshooting and Support, customer_relations_manages, Business Intelligence Integration>
+<Troubleshooting and Support, partOf, Troubleshooting and Support>
+<User Access Management, connectedTo, Troubleshooting and Support>
+<User Access Management, partOf, User Access Management>
+<User Training, connectedTo, ERP System Selection>
+<User Training, partOf, User Training>
+<Vendor Management, connectedTo, Sales and Distribution>
+<Vendor Management, consults, Business Process Re_engineering>
diff --git a/test/graphviz/graph_hard/graphviz_342.dot b/test/graphviz/graph_hard/graphviz_342.dot
new file mode 100644
index 0000000000000000000000000000000000000000..17f0d6f3d666f622861b7f4d6fa3a5f02c099851
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_342.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=RL
+	N0 [label="System Upgrade" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Inventory Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N2 [label="Workflow Automation in ERP" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N3 [label="Asset Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N4 [label="AI or ML in ERP" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N5 [label=Customization color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N6 [label="Performance Optimization" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N7 [label="User Acceptance Testing" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N8 [label="Customer Relationship Management" color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N9 [label="Procurement Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N10 [label="Business Process Re_engineering" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Troubleshooting and Support" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="User Access Management" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+		nest0_1 [label="Data Migration" color="#673AB7" fillcolor="#D1C4E9" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Data Governance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="User Training" color="#61CAC3" fillcolor="#C2E8E6" shape=Mdiamond style=filled]
+		nest1_1 [label="Supply Chain Management" color="#61CAC3" fillcolor="#C2E8E6" shape=parallelogram style=filled]
+		nest1_2 [label="Cloud ERP Deployment" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+		nest1_3 [label="Security Management" color="#BA68C8" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [label=upgrades color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=procurements_handles color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N6 [label=reports color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label=controls color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [label=projects_manages color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=configures color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_342.txt b/test/graphviz/graph_hard/graphviz_342.txt
new file mode 100644
index 0000000000000000000000000000000000000000..87cfde7c0715de642710dd47a0f933ddfa137fdc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_342.txt
@@ -0,0 +1,35 @@
+<AI or ML in ERP, connectedTo, Customer Relationship Management>
+<AI or ML in ERP, connectedTo, Performance Optimization>
+<AI or ML in ERP, connectedTo, Procurement Management>
+<AI or ML in ERP, connectedTo, User Acceptance Testing>
+<AI or ML in ERP, procurements_handles, Customization>
+<AI or ML in ERP, projects_manages, Customer Relationship Management>
+<Asset Management, configures, Business Process Re_engineering>
+<Asset Management, connectedTo, AI or ML in ERP>
+<Asset Management, connectedTo, Customer Relationship Management>
+<Asset Management, connectedTo, Customization>
+<Asset Management, connectedTo, User Acceptance Testing>
+<Asset Management, controls, Procurement Management>
+<Cloud ERP Deployment, partOf, Cloud ERP Deployment>
+<Cloud ERP Deployment, upgrades, Security Management>
+<Customer Relationship Management, connectedTo, Procurement Management>
+<Customer Relationship Management, connectedTo, User Access Management>
+<Customization, connectedTo, Performance Optimization>
+<Data Migration, connectedTo, Business Process Re_engineering>
+<Data Migration, partOf, Data Migration>
+<Inventory Management, connectedTo, Workflow Automation in ERP>
+<Performance Optimization, connectedTo, User Acceptance Testing>
+<Performance Optimization, connectedTo, User Training>
+<Procurement Management, connectedTo, Business Process Re_engineering>
+<Security Management, partOf, Security Management>
+<Security Management, reports, Performance Optimization>
+<Supply Chain Management, connectedTo, Cloud ERP Deployment>
+<Supply Chain Management, partOf, Supply Chain Management>
+<System Upgrade, connectedTo, Inventory Management>
+<User Acceptance Testing, connectedTo, Customer Relationship Management>
+<User Access Management, connectedTo, Data Migration>
+<User Access Management, partOf, User Access Management>
+<User Training, connectedTo, Supply Chain Management>
+<User Training, partOf, User Training>
+<Workflow Automation in ERP, connectedTo, Asset Management>
+<Workflow Automation in ERP, connectedTo, Business Process Re_engineering>
diff --git a/test/graphviz/graph_hard/graphviz_343.txt b/test/graphviz/graph_hard/graphviz_343.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3bbcc096c7f732d834b9283b6aa6b46277460285
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_343.txt
@@ -0,0 +1,31 @@
+<Aquaculture Monitoring, connectedTo, Predictive Analytics for Harvest>
+<Automated Farm Machinery, connectedTo, Geographic Information Systems for Farms>
+<Automated Farm Machinery, partOf, Automated Farm Machinery>
+<Automated Irrigation, connectedTo, Carbon Farming Initiatives>
+<Automated Irrigation, connectedTo, Farm Management Software>
+<Automated Irrigation, connectedTo, Forestry Management with Digital Tools>
+<Automated Irrigation, connectedTo, Geographic Information Systems for Farms>
+<Carbon Farming Initiatives, connectedTo, Digital Soil Mapping>
+<Carbon Farming Initiatives, connectedTo, Forestry Management with Digital Tools>
+<Carbon Farming Initiatives, connectedTo, Geographic Information Systems for Farms>
+<Digital Soil Mapping, connectedTo, Yield Mapping>
+<Farm Data Integration, connectedTo, Digital Soil Mapping>
+<Farm Data Integration, partOf, Farm Data Integration>
+<Farm Management Dashboards, connectedTo, Satellite Imaging>
+<Farm Management Software, connectedTo, Carbon Farming Initiatives>
+<Farm Management Software, connectedTo, Variable Rate Application>
+<Geographic Information Systems for Farms, connectedTo, Aquaculture Monitoring>
+<Livestock Feeding Automation, connectedTo, Farm Management Dashboards>
+<Precision Farming, connectedTo, Automated Farm Machinery>
+<Precision Farming, partOf, Precision Farming>
+<Predictive Analytics for Harvest, connectedTo, Supply Chain Traceability>
+<Satellite Imaging, connectedTo, Automated Irrigation>
+<Satellite Imaging, connectedTo, Sensor Deployment>
+<Sensor Deployment, connectedTo, Geographic Information Systems for Farms>
+<Sensor Deployment, connectedTo, Precision Farming>
+<Sensor Deployment, partOf, Sensor Deployment>
+<Smart Livestock Monitoring, connectedTo, Geographic Information Systems for Farms>
+<Supply Chain Traceability, connectedTo, Forestry Management with Digital Tools>
+<Variable Rate Application, connectedTo, Farm Data Integration>
+<Variable Rate Application, partOf, Variable Rate Application>
+<Yield Mapping, connectedTo, Smart Livestock Monitoring>
diff --git a/test/graphviz/graph_hard/graphviz_344.dot b/test/graphviz/graph_hard/graphviz_344.dot
new file mode 100644
index 0000000000000000000000000000000000000000..40a4ea6b3a60fa8f62110e09e8e2a608df318d24
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_344.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Farm Robotics" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N1 [label="Predictive Analytics for Harvest" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N2 [label="Digital Soil Mapping" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+	N3 [label="Farm Labor Management Software" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N4 [label="Resource Optimization" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N5 [label="Crop Insurance Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	N6 [label="Variable Rate Application" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N7 [label="AI for Crop Disease Detection" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N8 [label="Smart Greenhouses" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N9 [label="Farm Data Integration" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N10 [label="Blockchain for Agri_Supply Chain" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N11 [label="Automated Farm Machinery" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N12 [label="Forestry Management with Digital Tools" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N13 [label="Farm Management Software" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N14 [label="Smart Livestock Monitoring" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N15 [label="Vertical Farming Technology" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N16 [label="Herd Health Monitoring" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N17 [label="Weather Station Data Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N18 [label="Carbon Farming Initiatives" color="#BDAFA8" fillcolor="#E4E0DF" shape=hexagon style=filled]
+	N19 [label="Market Price Forecasting" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N20 [label="Sustainability Metrics Tracking" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Farm Management Dashboards" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Automated Irrigation" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+		nest0_1 [label="Crop Health Monitoring" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Decision Support Systems for Farmers" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Sensor Deployment" color="#AF56A6" fillcolor="#DDCEDD" shape=oval style=filled]
+		nest1_1 [label="IoT in Agriculture" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N19 -> N20 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest0_0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N19 -> nest1_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N12 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N13 -> S0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [label=crops_grows color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [label=visualizes color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N15 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N20 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_345.dot b/test/graphviz/graph_hard/graphviz_345.dot
new file mode 100644
index 0000000000000000000000000000000000000000..519eee686068d32b9a2acb92b4645f4e7b10095d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_345.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label="Forestry Management with Digital Tools" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="IoT in Agriculture" color="#FFB74D" fillcolor="#FFF3E0" shape=oval style=filled]
+	N2 [label="Aquaculture Monitoring" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N3 [label="Weather Station Data Integration" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N4 [label="Drone Monitoring" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N5 [label="Decision Support Systems for Farmers" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N6 [label="Digital Agronomy" color="#A188D0" fillcolor="#DACBE3" shape=plaintext style=filled]
+	N7 [label="Satellite Imaging" color="#FFB74D" fillcolor="#FFF3E0" shape=oval style=filled]
+	N8 [label="Supply Chain Traceability" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N9 [label="Connectivity Solutions" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N10 [label="Resource Optimization" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Vertical Farming Technology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Geographic Information Systems for Farms" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+		nest0_1 [label="Crop Insurance Assessment" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_2 [label="Farm Management Software" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest0_3 [label="Blockchain for Agri_Supply Chain" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Farm Labor Management Software" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Market Price Forecasting" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_1 [label="Digital Soil Mapping" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_2 [label="Farm Data Integration" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+		nest1_3 [label="Predictive Analytics for Harvest" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=harvests color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label=resource_efficiency_improves color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [label=analyzes_data color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [label=reports color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_348.txt b/test/graphviz/graph_hard/graphviz_348.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4fe175ef8b754330976690eaa8d3230a90de4753
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_348.txt
@@ -0,0 +1,31 @@
+<Anti_Cheat Measures, connectedTo, Player Scouting>
+<Coaching Staff Management, connectedTo, Gambling and Betting Regulation>
+<Coaching Staff Management, partOf, Coaching Staff Management>
+<Gambling and Betting Regulation, connectedTo, Game Strategy Development>
+<Gambling and Betting Regulation, connectedTo, League Management>
+<Gambling and Betting Regulation, connectedTo, Legal Advisory for Esports>
+<Gambling and Betting Regulation, connectedTo, Live Streaming Production>
+<Gambling and Betting Regulation, connectedTo, Training Regimen>
+<Game Server Management, connectedTo, Gambling and Betting Regulation>
+<Game Server Management, connectedTo, League Management>
+<Game Server Management, connectedTo, Social Media Management>
+<Game Strategy Development, connectedTo, Player Contracts>
+<League Management, connectedTo, Team Management>
+<Legal Advisory for Esports, connectedTo, Live Streaming Production>
+<Live Streaming Production, connectedTo, Game Strategy Development>
+<Mental Health Support for Players, connectedTo, Rules and Regulations Enforcement>
+<Mental Health Support for Players, partOf, Mental Health Support for Players>
+<Player Scouting, connectedTo, Game Server Management>
+<Player Scouting, connectedTo, League Management>
+<Rules and Regulations Enforcement, connectedTo, Game Strategy Development>
+<Rules and Regulations Enforcement, partOf, Rules and Regulations Enforcement>
+<Social Media Management, connectedTo, Talent Representation>
+<Social Media Management, partOf, Social Media Management>
+<Talent Representation, connectedTo, Coaching Staff Management>
+<Talent Representation, partOf, Talent Representation>
+<Team Management, connectedTo, Game Strategy Development>
+<Team Management, connectedTo, Live Streaming Production>
+<Team Management, connectedTo, Mental Health Support for Players>
+<Team Management, connectedTo, Player Contracts>
+<Team Management, creates_experiences, Legal Advisory for Esports>
+<Training Regimen, connectedTo, League Management>
diff --git a/test/graphviz/graph_hard/graphviz_349.dot b/test/graphviz/graph_hard/graphviz_349.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dd3e98c99299e8f9cbab0210af739487bc4ca910
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_349.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=LR
+	N0 [label="Transcranial Magnetic Stimulation" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N1 [label="Neurological Disorder Diagnosis" color="#E91E63" fillcolor="#FCE4EC" shape=oval style=filled]
+	N2 [label="Neurofeedback Therapy" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N3 [label="Memory Formation Research" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N4 [label="Stem Cell Research" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N5 [label="Brain Imaging" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N6 [label=Connectomics color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Neural Network Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Aging Brain Research" color="#B0C5CD" fillcolor="#DFE7EB" shape=Mdiamond style=filled]
+		nest0_1 [label="Consciousness Studies" color="#E91E63" fillcolor="#FCE4EC" shape=parallelogram style=filled]
+		nest0_2 [label="Spike Train Analysis" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest0_3 [label="Gene Therapy for Neurological Disorders" color="#E91E63" fillcolor="#FCE4EC" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Molecular Neuroscience" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Neuroethics color="#B0C5CD" fillcolor="#DFE7EB" shape=plaintext style=filled]
+		nest1_1 [label="Sleep Research" color="#B0C5CD" fillcolor="#DFE7EB" shape=parallelogram style=filled]
+		nest1_2 [label="Motor Control Research" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=discovers color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [label=circuits_understands color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_349.txt b/test/graphviz/graph_hard/graphviz_349.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f8c1363f215f983e913ec289c0d02e8eacaf3700
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_349.txt
@@ -0,0 +1,31 @@
+<Aging Brain Research, connectedTo, Consciousness Studies>
+<Aging Brain Research, partOf, Aging Brain Research>
+<Brain Imaging, connectedTo, Connectomics>
+<Consciousness Studies, connectedTo, Spike Train Analysis>
+<Consciousness Studies, partOf, Consciousness Studies>
+<Gene Therapy for Neurological Disorders, connectedTo, Stem Cell Research>
+<Gene Therapy for Neurological Disorders, partOf, Gene Therapy for Neurological Disorders>
+<Memory Formation Research, connectedTo, Stem Cell Research>
+<Motor Control Research, connectedTo, Neurological Disorder Diagnosis>
+<Motor Control Research, partOf, Motor Control Research>
+<Neuroethics, connectedTo, Sleep Research>
+<Neuroethics, partOf, Neuroethics>
+<Neurofeedback Therapy, connectedTo, Neuroethics>
+<Neurofeedback Therapy, discovers, Memory Formation Research>
+<Neurological Disorder Diagnosis, circuits_understands, Brain Imaging>
+<Neurological Disorder Diagnosis, connectedTo, Aging Brain Research>
+<Neurological Disorder Diagnosis, connectedTo, Brain Imaging>
+<Neurological Disorder Diagnosis, connectedTo, Connectomics>
+<Neurological Disorder Diagnosis, connectedTo, Memory Formation Research>
+<Neurological Disorder Diagnosis, connectedTo, Neurofeedback Therapy>
+<Neurological Disorder Diagnosis, connectedTo, Stem Cell Research>
+<Sleep Research, connectedTo, Motor Control Research>
+<Sleep Research, partOf, Sleep Research>
+<Spike Train Analysis, connectedTo, Gene Therapy for Neurological Disorders>
+<Spike Train Analysis, partOf, Spike Train Analysis>
+<Stem Cell Research, connectedTo, Brain Imaging>
+<Transcranial Magnetic Stimulation, connectedTo, Brain Imaging>
+<Transcranial Magnetic Stimulation, connectedTo, Connectomics>
+<Transcranial Magnetic Stimulation, connectedTo, Memory Formation Research>
+<Transcranial Magnetic Stimulation, connectedTo, Neurological Disorder Diagnosis>
+<Transcranial Magnetic Stimulation, connectedTo, Stem Cell Research>
diff --git a/test/graphviz/graph_hard/graphviz_35.dot b/test/graphviz/graph_hard/graphviz_35.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7923e43c79368728615a1032db039e85cce3a4b5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_35.dot
@@ -0,0 +1,89 @@
+digraph {
+	rankdir=LR
+	N0 [label="Hotel Check_in" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Tourist Information Desk" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N2 [label="Itinerary Planning" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N3 [label="Flight Booking" color="#D3EB9F" fillcolor="#F8FDD3" shape=octagon style=filled]
+	N4 [label="Souvenir Shopping" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N5 [label="Passport Renewal Assistance" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N6 [label="Group Tour Coordination" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N7 [label="Event Reservation" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N8 [label="Photo Capture" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+	N9 [label="Duty_Free Shopping" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N10 [label="Language Translation Service" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N11 [label="Local Transport" color="#D3EB9F" fillcolor="#F8FDD3" shape=oval style=filled]
+	N12 [label="Feedback Collection" color="#7E57C2" fillcolor="#EDE7F6" shape=hexagon style=filled]
+	N13 [label="Booking Modification" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N14 [label="Cruise Ship Boarding" color="#7E57C2" fillcolor="#EDE7F6" shape=plaintext style=filled]
+	N15 [label="Historical Site Exploration" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N16 [label="Return Trip" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Tour Guide Assignment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Restaurant Reservation" color="#D3EB9F" fillcolor="#F8FDD3" shape=oval style=filled]
+		nest0_1 [label="Currency Exchange" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+		nest0_2 [label="Spa Appointment" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+		nest0_3 [label="Custom Tour Package Creation" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Rental Car Pickup" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Sightseeing Scheduling" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest1_1 [label="Activity Booking" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest1_0 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N9 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [label=develops color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N15 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N13 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N14 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N16 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_350.txt b/test/graphviz/graph_hard/graphviz_350.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d310ba9be6fd8b0afccc571a107d0de6b4bec71e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_350.txt
@@ -0,0 +1,42 @@
+<Addiction Neuroscience, connectedTo, Neurodegenerative Disease Research>
+<Addiction Neuroscience, partOf, Addiction Neuroscience>
+<Cellular Neuroscience, connectedTo, Cognitive Neuroscience>
+<Cognitive Neuroscience, connectedTo, Motor Control Research>
+<Connectomics, connectedTo, Drug Development for Brain Disorders>
+<Connectomics, connectedTo, Neural Network Analysis>
+<Connectomics, connectedTo, Neurofeedback Therapy>
+<Connectomics, connectedTo, Optogenetics>
+<Connectomics, ethical_considers, Spike Train Analysis>
+<Deep Brain Stimulation, connectedTo, Sleep Research>
+<Drug Development for Brain Disorders, connectedTo, Optogenetics>
+<Electrophysiology, connectedTo, Drug Development for Brain Disorders>
+<Gene Therapy for Neurological Disorders, connectedTo, Memory Formation Research>
+<Genetic Basis of Brain Disorders, connectedTo, Cellular Neuroscience>
+<Genetic Basis of Brain Disorders, connectedTo, Cognitive Neuroscience>
+<Genetic Basis of Brain Disorders, connectedTo, Motor Control Research>
+<Genetic Basis of Brain Disorders, connectedTo, Neurotransmitter Research>
+<Genetic Basis of Brain Disorders, rehabilitates, Neural Network Analysis>
+<Learning Mechanisms Study, connectedTo, Neurofeedback Therapy>
+<Learning Mechanisms Study, connectedTo, Optogenetics>
+<Memory Formation Research, cognition_studies, Neuroprosthetics>
+<Memory Formation Research, connectedTo, Learning Mechanisms Study>
+<Memory Formation Research, connectedTo, Optogenetics>
+<Neural Data Analysis, connectedTo, Optogenetics>
+<Neural Data Analysis, partOf, Neural Data Analysis>
+<Neural Network Analysis, connectedTo, Neurotransmitter Research>
+<Neurodegenerative Disease Research, connectedTo, Cognitive Neuroscience>
+<Neurodegenerative Disease Research, partOf, Neurodegenerative Disease Research>
+<Neurofeedback Therapy, connectedTo, Electrophysiology>
+<Neurofeedback Therapy, connectedTo, Optogenetics>
+<Neuroprosthetics, connectedTo, Sensory Perception Research>
+<Neuroprosthetics, partOf, Neuroprosthetics>
+<Neurotransmitter Research, connectedTo, Cellular Neuroscience>
+<Optogenetics, connectedTo, Addiction Neuroscience>
+<Optogenetics, connectedTo, Genetic Basis of Brain Disorders>
+<Sensory Perception Research, connectedTo, Neural Data Analysis>
+<Sensory Perception Research, partOf, Sensory Perception Research>
+<Sleep Research, connectedTo, Cellular Neuroscience>
+<Sleep Research, connectedTo, Connectomics>
+<Spike Train Analysis, algorithms_develops, Synaptic Plasticity Study>
+<Synaptic Plasticity Study, connectedTo, Cellular Neuroscience>
+<Synaptic Plasticity Study, connectedTo, Gene Therapy for Neurological Disorders>
diff --git a/test/graphviz/graph_hard/graphviz_351.dot b/test/graphviz/graph_hard/graphviz_351.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bae938e469fc95d7f244cd8b8a70c0aa5dfd0ddb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_351.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=BT
+	N0 [label="Cellular Neuroscience" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N1 [label=Connectomics color="#42A5F5" fillcolor="#F1F8FF" shape=parallelogram style=filled]
+	N2 [label="Aging Brain Research" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N3 [label=Neuroprosthetics color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N4 [label="Gene Therapy for Neurological Disorders" color="#00BCD4" fillcolor="#B2EBF2" shape=Mdiamond style=filled]
+	N5 [label=Neuroethics color="#EAEFA5" fillcolor="#FDFCEB" shape=folder style=filled]
+	N6 [label="Brain Mapping" color="#00BCD4" fillcolor="#B2EBF2" shape=plaintext style=filled]
+	N7 [label="Neurofeedback Therapy" color="#42A5F5" fillcolor="#F1F8FF" shape=parallelogram style=filled]
+	N8 [label="Genetic Basis of Brain Disorders" color="#42A5F5" fillcolor="#F1F8FF" shape=oval style=filled]
+	N9 [label="Memory Formation Research" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N10 [label="Neurological Disorder Diagnosis" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N11 [label="Motor Control Research" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+	N12 [label="Brain Imaging" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+	N13 [label="Addiction Neuroscience" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N14 [label="Behavioral Neuroscience" color="#EAEFA5" fillcolor="#FDFCEB" shape=folder style=filled]
+	N15 [label="Neurotransmitter Research" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N16 [label="Artificial Neural Networks Modeling" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Systems Neuroscience" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Learning Mechanisms Study" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+		nest0_1 [label="Computational Neuroscience" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest0_2 [label="Sensory Perception Research" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Transcranial Magnetic Stimulation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Molecular Neuroscience" color="#EAEFA5" fillcolor="#FDFCEB" shape=folder style=filled]
+		nest1_1 [label="Neural Network Analysis" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+		nest1_2 [label="Sleep Research" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest1_3 [label="Neurodegenerative Disease Research" color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=brains_explores color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=neurons_investigates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=algorithms_develops color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=funds_raises color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [label=privacy_protects color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N11 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N10 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N14 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_351.txt b/test/graphviz/graph_hard/graphviz_351.txt
new file mode 100644
index 0000000000000000000000000000000000000000..da393df83c919ea34d7149f1a5ab58cf930e1f51
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_351.txt
@@ -0,0 +1,43 @@
+<Addiction Neuroscience, connectedTo, Behavioral Neuroscience>
+<Aging Brain Research, brains_explores, Neuroprosthetics>
+<Behavioral Neuroscience, connectedTo, Neurotransmitter Research>
+<Brain Imaging, connectedTo, Addiction Neuroscience>
+<Brain Imaging, connectedTo, Behavioral Neuroscience>
+<Brain Imaging, connectedTo, Neurotransmitter Research>
+<Brain Mapping, connectedTo, Brain Imaging>
+<Brain Mapping, connectedTo, Neurofeedback Therapy>
+<Cellular Neuroscience, connectedTo, Behavioral Neuroscience>
+<Cellular Neuroscience, connectedTo, Connectomics>
+<Computational Neuroscience, connectedTo, Sensory Perception Research>
+<Computational Neuroscience, partOf, Computational Neuroscience>
+<Connectomics, connectedTo, Aging Brain Research>
+<Gene Therapy for Neurological Disorders, connectedTo, Behavioral Neuroscience>
+<Gene Therapy for Neurological Disorders, connectedTo, Brain Imaging>
+<Gene Therapy for Neurological Disorders, neurons_investigates, Neuroethics>
+<Genetic Basis of Brain Disorders, connectedTo, Artificial Neural Networks Modeling>
+<Genetic Basis of Brain Disorders, connectedTo, Behavioral Neuroscience>
+<Genetic Basis of Brain Disorders, connectedTo, Memory Formation Research>
+<Genetic Basis of Brain Disorders, connectedTo, Molecular Neuroscience>
+<Genetic Basis of Brain Disorders, connectedTo, Neurological Disorder Diagnosis>
+<Learning Mechanisms Study, connectedTo, Computational Neuroscience>
+<Learning Mechanisms Study, partOf, Learning Mechanisms Study>
+<Memory Formation Research, connectedTo, Neurological Disorder Diagnosis>
+<Molecular Neuroscience, connectedTo, Neural Network Analysis>
+<Molecular Neuroscience, partOf, Molecular Neuroscience>
+<Motor Control Research, funds_raises, Brain Imaging>
+<Neural Network Analysis, connectedTo, Sleep Research>
+<Neural Network Analysis, partOf, Neural Network Analysis>
+<Neurodegenerative Disease Research, connectedTo, Neurological Disorder Diagnosis>
+<Neurodegenerative Disease Research, partOf, Neurodegenerative Disease Research>
+<Neuroethics, connectedTo, Brain Mapping>
+<Neurofeedback Therapy, algorithms_develops, Genetic Basis of Brain Disorders>
+<Neurofeedback Therapy, connectedTo, Behavioral Neuroscience>
+<Neurofeedback Therapy, connectedTo, Brain Imaging>
+<Neurofeedback Therapy, connectedTo, Learning Mechanisms Study>
+<Neurological Disorder Diagnosis, connectedTo, Motor Control Research>
+<Neuroprosthetics, connectedTo, Gene Therapy for Neurological Disorders>
+<Neurotransmitter Research, privacy_protects, Artificial Neural Networks Modeling>
+<Sensory Perception Research, connectedTo, Motor Control Research>
+<Sensory Perception Research, partOf, Sensory Perception Research>
+<Sleep Research, connectedTo, Neurodegenerative Disease Research>
+<Sleep Research, partOf, Sleep Research>
diff --git a/test/graphviz/graph_hard/graphviz_353.txt b/test/graphviz/graph_hard/graphviz_353.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0f6b3f2e2c557e1d9878baea751ed472f866b5ee
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_353.txt
@@ -0,0 +1,39 @@
+<Artifact Conservation, connectedTo, Intangible Cultural Heritage Preservation>
+<Artifact Conservation, partOf, Artifact Conservation>
+<Augmented Reality Tours, connectedTo, Oral History Collection>
+<Climate Change Impact on Heritage, connectedTo, Augmented Reality Tours>
+<Climate Change Impact on Heritage, partOf, Climate Change Impact on Heritage>
+<Community Engagement, conserves, Looting Prevention>
+<Crowdsourcing for Heritage Data, archives, Climate Change Impact on Heritage>
+<Crowdsourcing for Heritage Data, partOf, Crowdsourcing for Heritage Data>
+<Cultural Tourism Development, connectedTo, Material Analysis>
+<Digital Documentation, connectedTo, Adaptive Reuse of Heritage Buildings>
+<Digital Documentation, connectedTo, Heritage Impact Assessment>
+<Digital Documentation, connectedTo, Photogrammetry for Documentation>
+<Digital Documentation, connectedTo, Remote Sensing for Heritage>
+<Digital Documentation, data_collects, Adaptive Reuse of Heritage Buildings>
+<Exhibition Curation, connectedTo, Cultural Tourism Development>
+<Heritage Impact Assessment, connectedTo, Artifact Conservation>
+<Heritage Impact Assessment, partOf, Heritage Impact Assessment>
+<Intangible Cultural Heritage Preservation, connectedTo, Looting Prevention>
+<Intangible Cultural Heritage Preservation, partOf, Intangible Cultural Heritage Preservation>
+<Legal Protection for Heritage, connectedTo, Exhibition Curation>
+<Legal Protection for Heritage, connectedTo, Photogrammetry for Documentation>
+<Legal Protection for Heritage, displays, Augmented Reality Tours>
+<Looting Prevention, connectedTo, Adaptive Reuse of Heritage Buildings>
+<Looting Prevention, connectedTo, Crowdsourcing for Heritage Data>
+<Looting Prevention, connectedTo, Cultural Tourism Development>
+<Looting Prevention, connectedTo, Exhibition Curation>
+<Material Analysis, connectedTo, Sustainable Heritage Management>
+<Oral History Collection, connectedTo, Site Preservation>
+<Photogrammetry for Documentation, connectedTo, Adaptive Reuse of Heritage Buildings>
+<Photogrammetry for Documentation, connectedTo, Remote Sensing for Heritage>
+<Remote Sensing for Heritage, connectedTo, Adaptive Reuse of Heritage Buildings>
+<Site Preservation, connectedTo, Community Engagement>
+<Site Preservation, connectedTo, Exhibition Curation>
+<Site Preservation, connectedTo, Material Analysis>
+<Site Preservation, documents, Exhibition Curation>
+<Sustainable Heritage Management, connectedTo, Digital Documentation>
+<Sustainable Heritage Management, connectedTo, Photogrammetry for Documentation>
+<Traditional Knowledge Documentation, connectedTo, Legal Protection for Heritage>
+<Traditional Knowledge Documentation, narrates, Exhibition Curation>
diff --git a/test/graphviz/graph_hard/graphviz_354.txt b/test/graphviz/graph_hard/graphviz_354.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a3937dc35c5a46d20b17301eeba0def5c9d2ce4d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_354.txt
@@ -0,0 +1,31 @@
+<Adaptive Reuse of Heritage Buildings, connectedTo, GIS Mapping for Heritage Sites>
+<Archaeological Excavation, 3D_scans, GIS Mapping for Heritage Sites>
+<Archaeological Excavation, partOf, Archaeological Excavation>
+<Archival Management, connectedTo, Legal Protection for Heritage>
+<Community Engagement, connectedTo, Traditional Knowledge Documentation>
+<Community Engagement, partOf, Community Engagement>
+<Cultural Tourism Development, connectedTo, World Heritage Site Management>
+<Cultural Tourism Development, partOf, Cultural Tourism Development>
+<GIS Mapping for Heritage Sites, connectedTo, Intangible Cultural Heritage Preservation>
+<Indigenous Cultural Heritage Rights, connectedTo, GIS Mapping for Heritage Sites>
+<Indigenous Cultural Heritage Rights, connectedTo, Underwater Cultural Heritage>
+<Intangible Cultural Heritage Preservation, connectedTo, Repatriation of Artifacts>
+<Legal Protection for Heritage, connectedTo, 3D Scanning of Artifacts>
+<Legal Protection for Heritage, connectedTo, Cultural Tourism Development>
+<Repatriation of Artifacts, connectedTo, 3D Scanning of Artifacts>
+<Repatriation of Artifacts, connectedTo, Archival Management>
+<Repatriation of Artifacts, connectedTo, Legal Protection for Heritage>
+<Repatriation of Artifacts, connectedTo, Virtual Reality Recreations>
+<Repatriation of Artifacts, intangible_heritage_safeguards, Legal Protection for Heritage>
+<Traditional Knowledge Documentation, connectedTo, Archaeological Excavation>
+<Traditional Knowledge Documentation, partOf, Traditional Knowledge Documentation>
+<Underwater Cultural Heritage, AR or VR_uses, 3D Scanning of Artifacts>
+<Underwater Cultural Heritage, community_participates, GIS Mapping for Heritage Sites>
+<Underwater Cultural Heritage, connectedTo, Adaptive Reuse of Heritage Buildings>
+<Underwater Cultural Heritage, connectedTo, Archival Management>
+<Underwater Cultural Heritage, connectedTo, GIS Mapping for Heritage Sites>
+<Underwater Cultural Heritage, connectedTo, Legal Protection for Heritage>
+<Virtual Reality Recreations, connectedTo, Community Engagement>
+<Virtual Reality Recreations, partOf, Virtual Reality Recreations>
+<World Heritage Site Management, connectedTo, Underwater Cultural Heritage>
+<World Heritage Site Management, partOf, World Heritage Site Management>
diff --git a/test/graphviz/graph_hard/graphviz_356.txt b/test/graphviz/graph_hard/graphviz_356.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9ec3400daf147d721e54d000ce0d2a5b8b539fc9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_356.txt
@@ -0,0 +1,30 @@
+<Bio_manufacturing, connectedTo, Synthetic Organism Design>
+<Bio_manufacturing, partOf, Bio_manufacturing>
+<Biofoundry Operations, connectedTo, Cell_Free Systems>
+<Biofoundry Operations, partOf, Biofoundry Operations>
+<Biosensor Development, collaborates, Regulatory Frameworks>
+<Biosensor Development, connectedTo, Bioremediation Applications>
+<Biosensor Development, connectedTo, DNA Synthesis>
+<Biosensor Development, connectedTo, Drug Delivery Systems>
+<Biosensor Development, connectedTo, Sustainable Chemical Production>
+<CRISPR_Cas System Optimization, functions_implements, Sustainable Chemical Production>
+<Cell_Free Systems, connectedTo, Bioremediation Applications>
+<Cell_Free Systems, connectedTo, Biosensor Development>
+<DNA Storage Technologies, connectedTo, Cell_Free Systems>
+<DNA Storage Technologies, connectedTo, Vaccine Synthesis>
+<DNA Synthesis, connectedTo, Drug Delivery Systems>
+<Drug Delivery Systems, connectedTo, Regulatory Frameworks>
+<Ethical Implications, connectedTo, Cell_Free Systems>
+<Ethical Implications, partOf, Ethical Implications>
+<Microbial Factories, connectedTo, DNA Storage Technologies>
+<Novel Enzyme Creation, partOf, Novel Enzyme Creation>
+<Novel Enzyme Creation, safety_ensures, Ethical Implications>
+<Regulatory Frameworks, connectedTo, Bio_manufacturing>
+<Regulatory Frameworks, connectedTo, Bioremediation Applications>
+<Regulatory Frameworks, connectedTo, CRISPR_Cas System Optimization>
+<Regulatory Frameworks, connectedTo, Sustainable Chemical Production>
+<Sustainable Chemical Production, connectedTo, Bioremediation Applications>
+<Synthetic Organism Design, connectedTo, Biofoundry Operations>
+<Synthetic Organism Design, partOf, Synthetic Organism Design>
+<Vaccine Synthesis, connectedTo, Novel Enzyme Creation>
+<Vaccine Synthesis, partOf, Vaccine Synthesis>
diff --git a/test/graphviz/graph_hard/graphviz_358.dot b/test/graphviz/graph_hard/graphviz_358.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ce5e8c49c4cfd422fc478a8068c9f49b15b1cad0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_358.dot
@@ -0,0 +1,53 @@
+digraph {
+	rankdir=RL
+	N0 [label="Student Performance Tracking" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="EdTech Hardware Solutions" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N2 [label="Virtual Classrooms" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N3 [label="Adaptive Learning Systems" color="#C2B2F0" fillcolor="#EFE6FF" shape=folder style=filled]
+	N4 [label="Curriculum Digitization" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N5 [label="Parent Engagement Tools" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N6 [label="E_Learning Platform Design" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N7 [label="Accessibility in EdTech" color="#FBC02D" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+	N8 [label="Competency_Based Learning Platforms" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Digital Textbooks" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Interactive Content Creation" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_1 [label="Learning Analytics Dashboards" color="#81C784" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+		nest0_2 [label="Data Privacy in Education" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Student Information Systems" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Remote Learning Solutions" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest1_1 [label="Gamified Learning" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest1_2 [label="Personalized Learning Paths" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest1_3 [label="Learning Design Principles" color="#81C784" fillcolor="#F1F8E9" shape=oval style=filled]
+		nest1_0 -> nest1_1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=adaptive_learning_enables color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=platforms_builds color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=simulates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label=robotics_integrates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label=sells color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_358.txt b/test/graphviz/graph_hard/graphviz_358.txt
new file mode 100644
index 0000000000000000000000000000000000000000..975367fadb695451fbf5ea1ecbe22ccaca829b38
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_358.txt
@@ -0,0 +1,29 @@
+<Accessibility in EdTech, connectedTo, Competency_Based Learning Platforms>
+<Accessibility in EdTech, connectedTo, Remote Learning Solutions>
+<Adaptive Learning Systems, connectedTo, Curriculum Digitization>
+<Adaptive Learning Systems, connectedTo, Interactive Content Creation>
+<Curriculum Digitization, connectedTo, Accessibility in EdTech>
+<Curriculum Digitization, platforms_builds, Parent Engagement Tools>
+<Curriculum Digitization, robotics_integrates, E_Learning Platform Design>
+<Data Privacy in Education, connectedTo, Competency_Based Learning Platforms>
+<Data Privacy in Education, connectedTo, E_Learning Platform Design>
+<Data Privacy in Education, partOf, Data Privacy in Education>
+<E_Learning Platform Design, connectedTo, Accessibility in EdTech>
+<EdTech Hardware Solutions, adaptive_learning_enables, Virtual Classrooms>
+<Gamified Learning, connectedTo, Personalized Learning Paths>
+<Gamified Learning, partOf, Gamified Learning>
+<Interactive Content Creation, connectedTo, Learning Analytics Dashboards>
+<Interactive Content Creation, partOf, Interactive Content Creation>
+<Learning Analytics Dashboards, connectedTo, Data Privacy in Education>
+<Learning Analytics Dashboards, partOf, Learning Analytics Dashboards>
+<Learning Design Principles, connectedTo, Parent Engagement Tools>
+<Learning Design Principles, partOf, Learning Design Principles>
+<Parent Engagement Tools, connectedTo, Accessibility in EdTech>
+<Parent Engagement Tools, sells, Competency_Based Learning Platforms>
+<Parent Engagement Tools, simulates, E_Learning Platform Design>
+<Personalized Learning Paths, connectedTo, Learning Design Principles>
+<Personalized Learning Paths, partOf, Personalized Learning Paths>
+<Remote Learning Solutions, connectedTo, Gamified Learning>
+<Remote Learning Solutions, partOf, Remote Learning Solutions>
+<Student Performance Tracking, connectedTo, EdTech Hardware Solutions>
+<Virtual Classrooms, connectedTo, Adaptive Learning Systems>
diff --git a/test/graphviz/graph_hard/graphviz_360.dot b/test/graphviz/graph_hard/graphviz_360.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2bede29efcffaf2333ac0f74d7536ec035665c71
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_360.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="EdTech Hardware Solutions" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N1 [label="Gamified Learning" color="#CB9BE1" fillcolor="#F2E6F5" shape=folder style=filled]
+	N2 [label="Remote Learning Solutions" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N3 [label="Online Tutoring Platforms" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N4 [label="Educational Data Mining" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N5 [label="Badging and Certification Systems" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N6 [label="Accessibility in EdTech" color="#6FE1D5" fillcolor="#C9EFEC" shape=folder style=filled]
+	N7 [label="Augmented Reality in Education" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N8 [label="Virtual Classrooms" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N9 [label="Machine Learning for Learning Analytics" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N10 [label="Formative Assessment Tools" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	N11 [label="Educational Robotics" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N12 [label="Student Performance Tracking" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+	N13 [label="Digital Textbooks" color="#E91E63" fillcolor="#FCE4EC" shape=folder style=filled]
+	N14 [label="Massive Open Online Courses" color="#E91E63" fillcolor="#FCE4EC" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#FCE4EC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Competency_Based Learning Platforms" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Simulations for Learning" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest0_1 [label="Data Privacy in Education" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+		nest0_2 [label="Learning Design Principles" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+		nest0_3 [label="Virtual Reality in Education" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Learning Management System Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Assessment Tools" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_1 [label="Curriculum Digitization" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=tools_provides color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=parents_engages color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_37.dot b/test/graphviz/graph_hard/graphviz_37.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2be0d1361d5f3d3366b27ccbc92883c699e3ea0c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_37.dot
@@ -0,0 +1,87 @@
+digraph {
+	rankdir=BT
+	N0 [label="Title Check" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Rental Agreement" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N2 [label="Virtual Tour Creation" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N3 [label="Commission Distribution" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N4 [label="Zoning Compliance" color="#388E3C" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N5 [label="Price Negotiation" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N6 [label="Property Appraisal" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N7 [label="Property Valuation" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N8 [label="Open House Event" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N9 [label="Tenant Screening" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N10 [label="Commercial Lease Negotiation" color="#C2B2F0" fillcolor="#EFE6FF" shape=Mdiamond style=filled]
+	N11 [label="Contract Review" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N12 [label="Loan Pre_Approval" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N13 [label="Eviction Process" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N14 [label="Buyer Inquiry" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N15 [label="Escrow Setup" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N16 [label="Property Tax Payment" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N17 [label="Property Listing" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+	N18 [label="HOA Management" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_0 [label="Property Marketing" color="#FFC2C2" fillcolor="#FFEBEB" shape=Mdiamond style=filled]
+		nest0_1 [label="Home Inspection" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_2 [label="Renovation Planning" color="#388E3C" fillcolor="#F1F8E9" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Document Signing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Building Permit Application" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+		nest1_1 [label="Maintenance Request" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+		nest1_2 [label="Mortgage Application Assistance" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
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+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=leases color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=invests color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label=advertises color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N16 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N13 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N14 -> S1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> S2 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N17 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [label=complies color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [label=renovates color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N18 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [label=transfers color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_38.dot b/test/graphviz/graph_hard/graphviz_38.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b80edef58853fafa3f8c14e6835319c09d758ac5
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_38.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Investment Property Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Document Signing" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N2 [label="Zoning Compliance" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N3 [label="Tenant Screening" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N4 [label="Property Management" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N5 [label="Property Marketing" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N6 [label="Property Valuation" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N7 [label="Brokerage License Renewal" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N8 [label="Price Negotiation" color="#FFA726" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+	N9 [label="Legal Verification" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N10 [label="Commercial Lease Negotiation" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N11 [label="Contract Review" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N12 [label="Mortgage Application Assistance" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N13 [label="Site Visit Scheduling" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N14 [label="Loan Pre_Approval" color="#FF8A65" fillcolor="#FBE9E7" shape=octagon style=filled]
+	N15 [label="Virtual Tour Creation" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N16 [label="Escrow Setup" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N17 [label="Tax Assessment" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N18 [label="Land Acquisition" color="#CD8FF2" fillcolor="#ECCFF5" shape=oval style=filled]
+	N19 [label="Property Listing" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Property Tax Payment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Maintenance Request" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+		nest0_1 [label="Rental Agreement" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Property Appraisal" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="HOA Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+		nest1_1 [label="Closing Meeting" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_2 [label="Renovation Planning" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=zones color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=closes color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest0_0 [label=verifies color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N13 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N15 -> S1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S1 -> N19 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_39.dot b/test/graphviz/graph_hard/graphviz_39.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9f4281c4fff352432b62398831e4813209e2c3f8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_39.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=LR
+	N0 [label="Investment Property Analysis" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Title Check" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N2 [label="Contract Review" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N3 [label="Property Insurance" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N4 [label="Building Permit Application" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N5 [label="Property Valuation" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+	N6 [label="Property Management" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N7 [label="Closing Meeting" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+	N8 [label="Escrow Setup" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N9 [label="Brokerage License Renewal" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+	N10 [label="Property Tax Payment" color="#A1887F" fillcolor="#EFEBE9" shape=box style=filled]
+	N11 [label="Property Listing" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1887F" fillcolor="#EFEBE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Market Trend Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ownership Transfer" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+		nest0_1 [label="Commission Distribution" color="#A1887F" fillcolor="#EFEBE9" shape=ellipse style=filled]
+		nest0_2 [label="Rental Agreement" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Buyer Inquiry" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Open House Event" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest1_1 [label="Virtual Tour Creation" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+		nest1_2 [label="HOA Management" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest1_3 [label="Home Inspection" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=schedules color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=consults color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=renovates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N1 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=maintains color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_39.txt b/test/graphviz/graph_hard/graphviz_39.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8595f430241203c4ed9bfc1d5f6428340287a0ff
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_39.txt
@@ -0,0 +1,33 @@
+<Brokerage License Renewal, connectedTo, Open House Event>
+<Brokerage License Renewal, connectedTo, Property Tax Payment>
+<Building Permit Application, connectedTo, Property Tax Payment>
+<Building Permit Application, consults, Property Valuation>
+<Closing Meeting, connectedTo, Escrow Setup>
+<Commission Distribution, connectedTo, Rental Agreement>
+<Commission Distribution, partOf, Commission Distribution>
+<Contract Review, connectedTo, Property Insurance>
+<Escrow Setup, renovates, Brokerage License Renewal>
+<HOA Management, connectedTo, Home Inspection>
+<HOA Management, partOf, HOA Management>
+<Home Inspection, connectedTo, Brokerage License Renewal>
+<Home Inspection, partOf, Home Inspection>
+<Investment Property Analysis, connectedTo, Title Check>
+<Open House Event, connectedTo, Virtual Tour Creation>
+<Open House Event, partOf, Open House Event>
+<Ownership Transfer, connectedTo, Commission Distribution>
+<Ownership Transfer, partOf, Ownership Transfer>
+<Property Insurance, connectedTo, Building Permit Application>
+<Property Insurance, maintains, Property Tax Payment>
+<Property Management, connectedTo, Closing Meeting>
+<Property Tax Payment, connectedTo, Property Listing>
+<Property Valuation, connectedTo, Brokerage License Renewal>
+<Property Valuation, connectedTo, Escrow Setup>
+<Property Valuation, connectedTo, Property Listing>
+<Property Valuation, connectedTo, Property Management>
+<Property Valuation, connectedTo, Property Tax Payment>
+<Rental Agreement, connectedTo, Title Check>
+<Rental Agreement, partOf, Rental Agreement>
+<Title Check, connectedTo, Ownership Transfer>
+<Title Check, schedules, Contract Review>
+<Virtual Tour Creation, connectedTo, HOA Management>
+<Virtual Tour Creation, partOf, Virtual Tour Creation>
diff --git a/test/graphviz/graph_hard/graphviz_41.dot b/test/graphviz/graph_hard/graphviz_41.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e14674c73707af7595f0dd1c8233348a6112dd54
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_41.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Cybersecurity Threat Response" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N1 [label="SWAT Team Activation" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N2 [label="Hazard Detection" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N3 [label="Emergency Medical Service" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N4 [label="Post_Incident Review" color="#E0E0E0" fillcolor="#EBEBEB" shape=Mdiamond style=filled]
+	N5 [label="Surveillance Review" color="#94C0C0" fillcolor="#CADEDE" shape=parallelogram style=filled]
+	N6 [label="Responder Alert" color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+	N7 [label="Evidence Collection" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N8 [label="Suspect Identification" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N9 [label="Forensic Analysis" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N10 [label="Inmate Transport" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+	N11 [label="Victim Support Services" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#94C0C0" fillcolor="#CADEDE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Crime Prevention Programs" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="K9 Unit Deployment" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+		nest0_1 [label="Court Testimony" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_2 [label="Traffic Control" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+		nest0_3 [label="Community Outreach" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Witness Interview" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Crowd Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest1_1 [label="Crime Scene Analysis" color="#E0E0E0" fillcolor="#EBEBEB" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [label=controls color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=identifies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=alerts color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N5 [label=collaborates color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label=analyzes color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [label=equips color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	M2 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_41.txt b/test/graphviz/graph_hard/graphviz_41.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c905b4b91e40fc2a6a00d8cfefbbd45c59eeb252
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_41.txt
@@ -0,0 +1,34 @@
+<Community Outreach, connectedTo, SWAT Team Activation>
+<Community Outreach, partOf, Community Outreach>
+<Court Testimony, connectedTo, Traffic Control>
+<Court Testimony, partOf, Court Testimony>
+<Crime Scene Analysis, collaborates, Surveillance Review>
+<Crime Scene Analysis, partOf, Crime Scene Analysis>
+<Crowd Management, controls, Crime Scene Analysis>
+<Crowd Management, partOf, Crowd Management>
+<Cybersecurity Threat Response, connectedTo, SWAT Team Activation>
+<Cybersecurity Threat Response, connectedTo, Surveillance Review>
+<Emergency Medical Service, connectedTo, Crowd Management>
+<Emergency Medical Service, connectedTo, Post_Incident Review>
+<Emergency Medical Service, connectedTo, Surveillance Review>
+<Emergency Medical Service, connectedTo, Suspect Identification>
+<Evidence Collection, connectedTo, Suspect Identification>
+<Forensic Analysis, connectedTo, Inmate Transport>
+<Hazard Detection, identifies, Emergency Medical Service>
+<Inmate Transport, connectedTo, Victim Support Services>
+<K9 Unit Deployment, connectedTo, Court Testimony>
+<K9 Unit Deployment, partOf, K9 Unit Deployment>
+<Post_Incident Review, alerts, Surveillance Review>
+<Post_Incident Review, connectedTo, Suspect Identification>
+<Responder Alert, analyzes, Victim Support Services>
+<Responder Alert, connectedTo, Evidence Collection>
+<Responder Alert, connectedTo, Forensic Analysis>
+<Responder Alert, connectedTo, K9 Unit Deployment>
+<SWAT Team Activation, connectedTo, Hazard Detection>
+<SWAT Team Activation, connectedTo, Surveillance Review>
+<Surveillance Review, connectedTo, Responder Alert>
+<Suspect Identification, connectedTo, Forensic Analysis>
+<Suspect Identification, connectedTo, Victim Support Services>
+<Suspect Identification, equips, Inmate Transport>
+<Traffic Control, connectedTo, Community Outreach>
+<Traffic Control, partOf, Traffic Control>
diff --git a/test/graphviz/graph_hard/graphviz_42.dot b/test/graphviz/graph_hard/graphviz_42.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3e1af70a51548f3274009cc25366a59984ecad16
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_42.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=LR
+	N0 [label="K9 Unit Deployment" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Fire Suppression" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N2 [label="Crime Scene Analysis" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N3 [label="Hostage Negotiation" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N4 [label="Threat Assessment" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N5 [label="Post_Incident Review" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N6 [label="Surveillance Review" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N7 [label="Suspect Identification" color="#4DD0E1" fillcolor="#C9F0F0" shape=folder style=filled]
+	N8 [label="Resource Allocation" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N9 [label="Disaster Relief Coordination" color="#4DD0E1" fillcolor="#C9F0F0" shape=oval style=filled]
+	N10 [label="Emergency Dispatch" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N11 [label="Cybersecurity Threat Response" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N12 [label="Emergency Medical Service" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N13 [label="Public Safety Training" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N14 [label="Rescue Coordination" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N15 [label="SWAT Team Activation" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Patrol Scheduling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Community Outreach" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_1 [label="First Aid Deployment" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+		nest0_2 [label="Responder Alert" color="#4DD0E1" fillcolor="#C9F0F0" shape=diamond style=filled]
+		nest0_3 [label="Incident Reporting" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Incident Command System Activation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Crime Prevention Programs" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest1_1 [label="Evacuation Planning" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+		nest1_2 [label="Evidence Collection" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=certifies color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=trains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N8 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [label=identifies color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N11 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_43.dot b/test/graphviz/graph_hard/graphviz_43.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b4d748f3a9684e1633a51484a1078f4a582b16db
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_43.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=BT
+	N0 [label="Visual Effects" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Budget Planning" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N2 [label="Location Scouting" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N3 [label="Ticketing Sales" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N4 [label="Costume Design" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+	N5 [label="Live Performance" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N6 [label="Sound Engineering" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N7 [label="Trailer Production" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N8 [label="Animation Production" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N9 [label="Scene Scheduling" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N10 [label="Awards Ceremony Production" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N11 [label="Set Construction" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	S0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Game Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Script Writing" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+		nest0_1 [label="Editing Process" color="#BA68C8" fillcolor="#F3E5F5" shape=plaintext style=filled]
+		nest0_2 [label="Talent Management" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=archives color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Marketing Campaign" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Premiere Event" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+		nest1_1 [label="Press Junket" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+		nest1_2 [label="Concert Promotion" color="#BA68C8" fillcolor="#F3E5F5" shape=Mdiamond style=filled]
+		nest1_3 [label="Red Carpet Event" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=reviews color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N1 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N6 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [label=promotes color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [label=screens color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [label=performs color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#795548" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_44.txt b/test/graphviz/graph_hard/graphviz_44.txt
new file mode 100644
index 0000000000000000000000000000000000000000..68333ab847896721864dc0c5903ce3d42e9153cc
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_44.txt
@@ -0,0 +1,31 @@
+<Actor Rehearsal, connectedTo, Premiere Event>
+<Awards Ceremony Production, connectedTo, Actor Rehearsal>
+<Awards Ceremony Production, connectedTo, Casting Call>
+<Budget Planning, connectedTo, Scene Scheduling>
+<Budget Planning, partOf, Budget Planning>
+<Casting Call, masters, Licensing Approval>
+<Casting Call, partOf, Casting Call>
+<Costume Design, connectedTo, Stunt Coordination>
+<Costume Design, partOf, Costume Design>
+<Fan Engagement Strategy, connectedTo, Actor Rehearsal>
+<Fan Engagement Strategy, connectedTo, Film Festival Submission>
+<Film Festival Submission, connectedTo, Awards Ceremony Production>
+<Film Festival Submission, connectedTo, Intellectual Property Protection>
+<Intellectual Property Protection, connectedTo, Red Carpet Event>
+<Intellectual Property Protection, partOf, Intellectual Property Protection>
+<Licensing Approval, connectedTo, Costume Design>
+<Licensing Approval, partOf, Licensing Approval>
+<Live Performance, connectedTo, Press Junket>
+<Post_Production Audio Mixing, connectedTo, Actor Rehearsal>
+<Post_Production Audio Mixing, connectedTo, Talent Management>
+<Press Junket, connectedTo, Fan Engagement Strategy>
+<Red Carpet Event, critiques, Budget Planning>
+<Red Carpet Event, partOf, Red Carpet Event>
+<Scene Scheduling, connectedTo, Fan Engagement Strategy>
+<Scene Scheduling, partOf, Scene Scheduling>
+<Stunt Coordination, connectedTo, Casting Call>
+<Stunt Coordination, partOf, Stunt Coordination>
+<Stunt Coordination, protects, Awards Ceremony Production>
+<Talent Management, audits, Premiere Event>
+<Talent Management, connectedTo, Fan Engagement Strategy>
+<Talent Management, connectedTo, Live Performance>
diff --git a/test/graphviz/graph_hard/graphviz_46.dot b/test/graphviz/graph_hard/graphviz_46.dot
new file mode 100644
index 0000000000000000000000000000000000000000..93f7c2622e2244007cdad6fd1261c7af767f9aed
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_46.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=RL
+	N0 [label="Green Certification" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Wildlife Survey" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N2 [label="Ecological Footprint Analysis" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N3 [label="Conservation Easement" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N4 [label="Pollution Alert" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N5 [label="Resource Tracking" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N6 [label="Environmental Education Programs" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N7 [label="Soil Testing" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N8 [label="Water Sampling" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N9 [label="Ocean Cleanup" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+	N10 [label="Hazardous Material Handling" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N11 [label="Recycling Process" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N12 [label="Environmental Impact Assessment" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N13 [label="Energy Audit" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N14 [label="Air Quality Monitoring" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N15 [label="Renewable Energy Project Development" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N16 [label="Regulatory Compliance" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N17 [label="Species Reintroduction" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N18 [label="Waste Collection" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Emission Reporting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Climate Modeling" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+		nest0_1 [label="Landfill Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=plaintext style=filled]
+		nest0_2 [label="Pollution Control Technology" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+		nest0_3 [label="Biodiversity Conservation" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Sustainable Agriculture Practices" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Noise Pollution Measurement" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+		nest1_1 [label="Reforestation Planning" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=assesses color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [label=funds color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [label=detects color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N15 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N16 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N18 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N11 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N12 -> S1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_0 -> N6 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N11 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N12 -> N18 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_5.dot b/test/graphviz/graph_hard/graphviz_5.dot
new file mode 100644
index 0000000000000000000000000000000000000000..02191ca9d6d0dac63ae66e826080a194f2fc9cb6
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_5.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=BT
+	N0 [label="Patient Education" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N1 [label="Home Care Visit" color="#73C6BC" fillcolor="#D0EFEE" shape=octagon style=filled]
+	N2 [label="Wound Care" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N3 [label="Anesthesia Administration" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N4 [label="Pain Management" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Allergy Test" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N6 [label="Symptom Monitoring" color="#73C6BC" fillcolor="#D0EFEE" shape=octagon style=filled]
+	N7 [label=Referral color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N8 [label="Emergency Response" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N9 [label=Surgery color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+	N10 [label="Clinical Trial" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N11 [label="Health Screening" color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+	N12 [label="Patient Transfer" color="#26A69A" fillcolor="#E0F2F1" shape=folder style=filled]
+	N13 [label=Triage color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Epidemiological Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Case Review" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+		nest0_1 [label="Medical History" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+		nest0_2 [label="Telemedicine Consultation" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest0_3 [label="Physical Examination" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Medical Record Keeping" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Genetic Counseling" color="#26A69A" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest1_1 [label="Nutritional Counseling" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=manages color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=dispenses color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=immunizes color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=scans color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N5 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N6 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [label=administers color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=consults color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S2 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_5.txt b/test/graphviz/graph_hard/graphviz_5.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5444b744063436ef1f956811d176f6c5c68d9e15
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_5.txt
@@ -0,0 +1,38 @@
+<Allergy Test, connectedTo, Symptom Monitoring>
+<Anesthesia Administration, connectedTo, Symptom Monitoring>
+<Anesthesia Administration, manages, Pain Management>
+<Case Review, connectedTo, Medical History>
+<Case Review, partOf, Case Review>
+<Clinical Trial, dispenses, Health Screening>
+<Emergency Response, connectedTo, Genetic Counseling>
+<Emergency Response, connectedTo, Surgery>
+<Genetic Counseling, connectedTo, Nutritional Counseling>
+<Genetic Counseling, partOf, Genetic Counseling>
+<Health Screening, immunizes, Patient Transfer>
+<Home Care Visit, administers, Anesthesia Administration>
+<Home Care Visit, connectedTo, Emergency Response>
+<Home Care Visit, connectedTo, Referral>
+<Home Care Visit, connectedTo, Symptom Monitoring>
+<Home Care Visit, connectedTo, Wound Care>
+<Medical History, connectedTo, Telemedicine Consultation>
+<Medical History, partOf, Medical History>
+<Nutritional Counseling, connectedTo, Symptom Monitoring>
+<Nutritional Counseling, partOf, Nutritional Counseling>
+<Pain Management, connectedTo, Allergy Test>
+<Patient Education, connectedTo, Anesthesia Administration>
+<Patient Education, connectedTo, Home Care Visit>
+<Patient Education, connectedTo, Patient Transfer>
+<Patient Transfer, scans, Triage>
+<Physical Examination, connectedTo, Allergy Test>
+<Physical Examination, partOf, Physical Examination>
+<Referral, connectedTo, Case Review>
+<Referral, connectedTo, Emergency Response>
+<Surgery, connectedTo, Clinical Trial>
+<Symptom Monitoring, connectedTo, Health Screening>
+<Symptom Monitoring, connectedTo, Patient Transfer>
+<Symptom Monitoring, connectedTo, Referral>
+<Symptom Monitoring, connectedTo, Triage>
+<Symptom Monitoring, consults, Emergency Response>
+<Telemedicine Consultation, connectedTo, Physical Examination>
+<Telemedicine Consultation, partOf, Telemedicine Consultation>
+<Wound Care, connectedTo, Anesthesia Administration>
diff --git a/test/graphviz/graph_hard/graphviz_50.dot b/test/graphviz/graph_hard/graphviz_50.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b2de1c33f4b0f66bee4284b1100e67a5e2624149
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_50.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Publishing" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Permit Application" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N2 [label="Election Management" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N3 [label="Social Security Administration" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N4 [label="Transparency Audit" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N5 [label="Grant Distribution" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+	N6 [label="Driver's License Renewal" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N7 [label="Emergency Preparedness" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N8 [label="Tax Filing" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N9 [label="Whistleblower Protection" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N10 [label="National Defense" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N11 [label="Social Program Review" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N12 [label="Public Hearing" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N13 [label="Urban Planning" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N14 [label="Interdepartmental Approval" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N15 [label="Legal Advisory" color="#00BCD4" fillcolor="#E0F7FA" shape=hexagon style=filled]
+	N16 [label="Education Policy" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N17 [label="Code Enforcement" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+	N18 [label="Public Works Maintenance" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Public Sector Procurement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="ID Verification" color="#FFDA4E" fillcolor="#FFE88D" shape=oval style=filled]
+		nest0_1 [label="Public Health Initiative" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+		nest0_2 [label="Policy Drafting" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Open Government Data Initiative" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Public Records Request" color="#BCB88A" fillcolor="#F5F5DC" shape=plaintext style=filled]
+		nest1_1 [label="Veterans Affairs" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest1_2 [label="Border Control" color="#00BCD4" fillcolor="#E0F7FA" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> nest1_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N15 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_50.txt b/test/graphviz/graph_hard/graphviz_50.txt
new file mode 100644
index 0000000000000000000000000000000000000000..de5006aca17d232481ec8cff6d8842ff651a9277
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_50.txt
@@ -0,0 +1,43 @@
+<Border Control, connectedTo, Permit Application>
+<Border Control, partOf, Border Control>
+<Code Enforcement, connectedTo, Public Records Request>
+<Code Enforcement, connectedTo, Public Works Maintenance>
+<Data Publishing, connectedTo, Emergency Preparedness>
+<Data Publishing, connectedTo, Permit Application>
+<Data Publishing, connectedTo, Whistleblower Protection>
+<Driver's License Renewal, connectedTo, Emergency Preparedness>
+<Education Policy, connectedTo, Code Enforcement>
+<Election Management, connectedTo, Emergency Preparedness>
+<Election Management, connectedTo, Social Security Administration>
+<Election Management, connectedTo, Whistleblower Protection>
+<Emergency Preparedness, connectedTo, Tax Filing>
+<Emergency Preparedness, connectedTo, Whistleblower Protection>
+<Grant Distribution, connectedTo, Driver's License Renewal>
+<ID Verification, connectedTo, Public Health Initiative>
+<ID Verification, partOf, ID Verification>
+<Interdepartmental Approval, connectedTo, Legal Advisory>
+<Legal Advisory, connectedTo, Code Enforcement>
+<Legal Advisory, connectedTo, Education Policy>
+<Legal Advisory, connectedTo, Public Works Maintenance>
+<National Defense, connectedTo, Social Program Review>
+<Permit Application, connectedTo, Election Management>
+<Policy Drafting, connectedTo, Urban Planning>
+<Policy Drafting, partOf, Policy Drafting>
+<Public Health Initiative, connectedTo, Policy Drafting>
+<Public Health Initiative, partOf, Public Health Initiative>
+<Public Hearing, connectedTo, Code Enforcement>
+<Public Hearing, connectedTo, Legal Advisory>
+<Public Hearing, connectedTo, Public Works Maintenance>
+<Public Hearing, connectedTo, Urban Planning>
+<Public Records Request, connectedTo, Veterans Affairs>
+<Public Records Request, partOf, Public Records Request>
+<Social Program Review, connectedTo, Public Hearing>
+<Social Security Administration, connectedTo, ID Verification>
+<Social Security Administration, connectedTo, Transparency Audit>
+<Tax Filing, connectedTo, Whistleblower Protection>
+<Transparency Audit, connectedTo, Emergency Preparedness>
+<Transparency Audit, connectedTo, Grant Distribution>
+<Urban Planning, connectedTo, Interdepartmental Approval>
+<Veterans Affairs, connectedTo, Border Control>
+<Veterans Affairs, partOf, Veterans Affairs>
+<Whistleblower Protection, connectedTo, National Defense>
diff --git a/test/graphviz/graph_hard/graphviz_51.dot b/test/graphviz/graph_hard/graphviz_51.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c8335eb5ef47fef34bdd92712ff4cc7e5eb7be4b
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_51.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Urban Planning" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N1 [label="International Relations" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N2 [label="Driver's License Renewal" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N3 [label="Election Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+	N4 [label="Interdepartmental Approval" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+	N5 [label="Legislation Review" color="#64B5F6" fillcolor="#E3F2FD" shape=Mdiamond style=filled]
+	N6 [label="Infrastructure Planning" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N7 [label="Tax Filing" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+	N8 [label="Budget Allocation" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N9 [label="Education Policy" color="#4DB6AC" fillcolor="#E0F2F1" shape=oval style=filled]
+	N10 [label="Citizen Feedback" color="#EAEFA5" fillcolor="#FDFCEB" shape=folder style=filled]
+	N11 [label="Census Collection" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N12 [label="Whistleblower Protection" color="#EAEFA5" fillcolor="#FDFCEB" shape=octagon style=filled]
+	N13 [label="Emergency Preparedness" color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+	N14 [label="Service Registration" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N15 [label="Open Government Data Initiative" color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+	N16 [label="Grant Distribution" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N17 [label="Vehicle Registration" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N18 [label="Diplomatic Negotiation" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Passport Issuance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="National Defense" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest0_1 [label="Policy Drafting" color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Transparency Audit" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Public Consultation" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest1_1 [label="Compliance Checking" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest1_2 [label="Public Hearing" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest1_3 [label="Legal Advisory" color="#EAEFA5" fillcolor="#FDFCEB" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> nest0_0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N10 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [label=negotiates color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N15 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_51.txt b/test/graphviz/graph_hard/graphviz_51.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7a752888df1b4113e08894928f422453a201d24a
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_51.txt
@@ -0,0 +1,41 @@
+<Budget Allocation, connectedTo, Education Policy>
+<Census Collection, connectedTo, Whistleblower Protection>
+<Citizen Feedback, connectedTo, Census Collection>
+<Compliance Checking, connectedTo, Public Hearing>
+<Compliance Checking, partOf, Compliance Checking>
+<Driver's License Renewal, connectedTo, Election Management>
+<Education Policy, connectedTo, Citizen Feedback>
+<Election Management, connectedTo, Interdepartmental Approval>
+<Emergency Preparedness, connectedTo, Service Registration>
+<Grant Distribution, connectedTo, Vehicle Registration>
+<Infrastructure Planning, connectedTo, Tax Filing>
+<Interdepartmental Approval, connectedTo, Legislation Review>
+<Interdepartmental Approval, negotiates, Open Government Data Initiative>
+<International Relations, connectedTo, Driver's License Renewal>
+<International Relations, connectedTo, Infrastructure Planning>
+<International Relations, connectedTo, Legislation Review>
+<International Relations, connectedTo, Open Government Data Initiative>
+<International Relations, connectedTo, Public Consultation>
+<International Relations, connectedTo, Service Registration>
+<Legal Advisory, connectedTo, Citizen Feedback>
+<Legal Advisory, partOf, Legal Advisory>
+<Legislation Review, connectedTo, Infrastructure Planning>
+<National Defense, connectedTo, Policy Drafting>
+<National Defense, partOf, National Defense>
+<Open Government Data Initiative, connectedTo, Grant Distribution>
+<Open Government Data Initiative, connectedTo, National Defense>
+<Policy Drafting, connectedTo, Diplomatic Negotiation>
+<Policy Drafting, partOf, Policy Drafting>
+<Public Consultation, connectedTo, Compliance Checking>
+<Public Consultation, partOf, Public Consultation>
+<Public Hearing, connectedTo, Legal Advisory>
+<Public Hearing, partOf, Public Hearing>
+<Service Registration, connectedTo, Open Government Data Initiative>
+<Tax Filing, connectedTo, Budget Allocation>
+<Tax Filing, connectedTo, Education Policy>
+<Tax Filing, connectedTo, Grant Distribution>
+<Tax Filing, connectedTo, Open Government Data Initiative>
+<Tax Filing, connectedTo, Vehicle Registration>
+<Urban Planning, connectedTo, International Relations>
+<Vehicle Registration, connectedTo, Diplomatic Negotiation>
+<Whistleblower Protection, connectedTo, Emergency Preparedness>
diff --git a/test/graphviz/graph_hard/graphviz_54.dot b/test/graphviz/graph_hard/graphviz_54.dot
new file mode 100644
index 0000000000000000000000000000000000000000..887d2efe592dcc7c04db713f472923190409fe40
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_54.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Self_Checkout Assistance" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Gift Wrapping" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N2 [label="Visual Merchandising" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N3 [label="Shelf Restocking" color="#AB47BC" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N4 [label="Shopping Cart Collection" color="#AB47BC" fillcolor="#F3E5F5" shape=oval style=filled]
+	N5 [label="Point of Sale System Update" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N6 [label="Order Fulfillment" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N7 [label="Loss Prevention" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N8 [label="Complaint Management" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N9 [label="Return Handling" color="#BA68C8" fillcolor="#F3E5F5" shape=diamond style=filled]
+	N10 [label="Supplier Payment" color="#BA68C8" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N11 [label="Customer Survey" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N12 [label="Receipt Issuing" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BA68C8" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Customer Loyalty Analytics" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Stock Replenishment" color="#FFF8A6" fillcolor="#FFFDE0" shape=plaintext style=filled]
+		nest0_1 [label="Online Order Pickup" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Product Demonstration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="E_commerce Platform Integration" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+		nest1_1 [label="Seasonal Sales Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=plaintext style=filled]
+		nest1_2 [label="Store Layout Design" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N11 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_55.dot b/test/graphviz/graph_hard/graphviz_55.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bdb4ce3657b88d424c57818f1ed3169602eb2f4c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_55.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=RL
+	N0 [label="Dealership Sales" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Electric Vehicle Battery Production" color="#607D8B" fillcolor="#CFD8DC" shape=plaintext style=filled]
+	N2 [label="Vehicle Connectivity" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N3 [label="Road Testing" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N4 [label="Paint Application" color="#D3EB9F" fillcolor="#F8FDD3" shape=octagon style=filled]
+	N5 [label="Global Supply Chain Management" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N6 [label="Vehicle Financing" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N7 [label="Autonomous Driving Software Development" color="#D3EB9F" fillcolor="#F8FDD3" shape=Mdiamond style=filled]
+	N8 [label="Assembly Line Setup" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+	N9 [label="Brake System Check" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N10 [label="Maintenance Scheduling" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N11 [label="Recycling of Vehicle Components" color="#607D8B" fillcolor="#CFD8DC" shape=octagon style=filled]
+	N12 [label="Recall Management" color="#F44336" fillcolor="#FFCDD2" shape=plaintext style=filled]
+	N13 [label="Warranty Activation" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N14 [label="Crash Simulation" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N15 [label="Parts Distribution" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N16 [label="Oil Change" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#607D8B" fillcolor="#CFD8DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Diagnostic Trouble Code Reading" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Inventory Tracking" color="#607D8B" fillcolor="#CFD8DC" shape=oval style=filled]
+		nest0_1 [label="Vehicle Registration" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+		nest0_2 [label="Customer Test Drive" color="#F44336" fillcolor="#FFCDD2" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Research and Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Component Testing" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+		nest1_1 [label="Engine Installation" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest1_0 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N13 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_55.txt b/test/graphviz/graph_hard/graphviz_55.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cb29ec551fc7e0aa3a5d9c2967239f5e7dc9b825
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_55.txt
@@ -0,0 +1,37 @@
+<Assembly Line Setup, connectedTo, Brake System Check>
+<Autonomous Driving Software Development, connectedTo, Assembly Line Setup>
+<Autonomous Driving Software Development, connectedTo, Brake System Check>
+<Brake System Check, connectedTo, Maintenance Scheduling>
+<Component Testing, connectedTo, Engine Installation>
+<Component Testing, partOf, Component Testing>
+<Crash Simulation, connectedTo, Parts Distribution>
+<Customer Test Drive, connectedTo, Assembly Line Setup>
+<Customer Test Drive, partOf, Customer Test Drive>
+<Dealership Sales, connectedTo, Electric Vehicle Battery Production>
+<Electric Vehicle Battery Production, connectedTo, Vehicle Connectivity>
+<Engine Installation, connectedTo, Warranty Activation>
+<Engine Installation, partOf, Engine Installation>
+<Global Supply Chain Management, connectedTo, Brake System Check>
+<Global Supply Chain Management, connectedTo, Recall Management>
+<Global Supply Chain Management, connectedTo, Vehicle Financing>
+<Inventory Tracking, connectedTo, Vehicle Registration>
+<Inventory Tracking, partOf, Inventory Tracking>
+<Maintenance Scheduling, connectedTo, Recycling of Vehicle Components>
+<Paint Application, connectedTo, Brake System Check>
+<Paint Application, connectedTo, Global Supply Chain Management>
+<Parts Distribution, connectedTo, Oil Change>
+<Recall Management, connectedTo, Component Testing>
+<Recall Management, connectedTo, Inventory Tracking>
+<Recall Management, connectedTo, Warranty Activation>
+<Recycling of Vehicle Components, connectedTo, Recall Management>
+<Road Testing, connectedTo, Brake System Check>
+<Road Testing, connectedTo, Paint Application>
+<Vehicle Connectivity, connectedTo, Brake System Check>
+<Vehicle Connectivity, connectedTo, Crash Simulation>
+<Vehicle Connectivity, connectedTo, Recall Management>
+<Vehicle Connectivity, connectedTo, Recycling of Vehicle Components>
+<Vehicle Connectivity, connectedTo, Road Testing>
+<Vehicle Financing, connectedTo, Autonomous Driving Software Development>
+<Vehicle Registration, connectedTo, Customer Test Drive>
+<Vehicle Registration, partOf, Vehicle Registration>
+<Warranty Activation, connectedTo, Crash Simulation>
diff --git a/test/graphviz/graph_hard/graphviz_57.txt b/test/graphviz/graph_hard/graphviz_57.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1932bde3971def89756dc8f389f925ddbac5e906
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_57.txt
@@ -0,0 +1,34 @@
+<After_sales Service, connectedTo, Software Calibration>
+<After_sales Service, partOf, After_sales Service>
+<Assembly Line Setup, connectedTo, Fluid Level Check>
+<Assembly Line Setup, connectedTo, Robotics in Production>
+<Brake System Check, connectedTo, Assembly Line Setup>
+<Brake System Check, connectedTo, Spare Parts Order>
+<Component Testing, connectedTo, Global Supply Chain Management>
+<Customer Relationship Management, connectedTo, Engine Installation>
+<Customer Relationship Management, partOf, Customer Relationship Management>
+<Emission Testing, connectedTo, Component Testing>
+<Emission Testing, connectedTo, Global Supply Chain Management>
+<Emission Testing, connectedTo, Supplier Selection>
+<Engine Installation, connectedTo, Oil Change>
+<Fluid Level Check, connectedTo, Emission Testing>
+<Global Supply Chain Management, connectedTo, Supplier Selection>
+<Oil Change, connectedTo, Assembly Line Setup>
+<Oil Change, connectedTo, Component Testing>
+<Oil Change, connectedTo, Emission Testing>
+<Oil Change, connectedTo, Global Supply Chain Management>
+<Parts Distribution, connectedTo, Vehicle Connectivity>
+<Parts Distribution, partOf, Parts Distribution>
+<Recall Management, connectedTo, Brake System Check>
+<Recall Management, partOf, Recall Management>
+<Robotics in Production, connectedTo, Parts Distribution>
+<Robotics in Production, partOf, Robotics in Production>
+<Software Calibration, audits, Recall Management>
+<Software Calibration, partOf, Software Calibration>
+<Spare Parts Order, connectedTo, After_sales Service>
+<Spare Parts Order, connectedTo, Engine Installation>
+<Vehicle Connectivity, connectedTo, Customer Relationship Management>
+<Vehicle Connectivity, partOf, Vehicle Connectivity>
+<Vehicle Design, connectedTo, Brake System Check>
+<Vehicle Financing, connectedTo, Assembly Line Setup>
+<Vehicle Financing, schedules, Vehicle Design>
diff --git a/test/graphviz/graph_hard/graphviz_58.dot b/test/graphviz/graph_hard/graphviz_58.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7c1271569e1119c30377f4f42d86550efcc308b1
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_58.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=LR
+	N0 [label="Emergency Protocols" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N1 [label="Flight Crew Training" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N2 [label="Propulsion Testing" color="#7E57C2" fillcolor="#EDE7F6" shape=folder style=filled]
+	N3 [label="Aircraft Manufacturing" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N4 [label="Astronaut Training" color="#FFCC7A" fillcolor="#FFF6D9" shape=oval style=filled]
+	N5 [label="International Space Station Resupply" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N6 [label="Air Traffic Control Integration" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N7 [label="Rocket Stage Separation" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N8 [label="Aircraft Maintenance Log" color="#FFF176" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N9 [label="Drone System Development" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N10 [label="System Reboot" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Launch Execution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Extravehicular Activity Planning" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_1 [label="Fueling Procedure" color="#FFCC7A" fillcolor="#FFF6D9" shape=octagon style=filled]
+		nest0_2 [label="Re_entry Vehicle Design" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_3 [label="Aviation Safety Audit" color="#FFCC7A" fillcolor="#FFF6D9" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Spacecraft Telemetry Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Rocket Assembly" color="#FFF176" fillcolor="#FFFDE7" shape=Mdiamond style=filled]
+		nest1_1 [label="Flight Simulation" color="#7E57C2" fillcolor="#EDE7F6" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N10 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_59.txt b/test/graphviz/graph_hard/graphviz_59.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fc0aa9bff4fbebf2b9959321972f159f236110c8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_59.txt
@@ -0,0 +1,32 @@
+<Air Traffic Control Integration, connectedTo, Hypersonic Flight Testing>
+<Air Traffic Control Integration, partOf, Air Traffic Control Integration>
+<Aircraft Maintenance Log, connectedTo, Orbit Adjustment>
+<Aircraft Maintenance Log, partOf, Aircraft Maintenance Log>
+<Airframe Assembly, connectedTo, Mission Planning>
+<Airframe Assembly, connectedTo, Orbit Adjustment>
+<Airframe Assembly, connectedTo, Spacecraft Telemetry Analysis>
+<Airframe Assembly, connectedTo, Thermal Shield Testing>
+<Component Recovery, connectedTo, Space Debris Tracking>
+<Drone System Development, connectedTo, Emergency Protocols>
+<Drone System Development, connectedTo, Spacecraft Telemetry Analysis>
+<Drone System Development, navigates, Component Recovery>
+<Emergency Protocols, connectedTo, Component Recovery>
+<Emergency Protocols, connectedTo, Telemetry Setup>
+<Ground Station Coordination, connectedTo, Orbit Adjustment>
+<Hypersonic Flight Testing, connectedTo, Satellite Configuration>
+<Hypersonic Flight Testing, partOf, Hypersonic Flight Testing>
+<Mission Planning, connectedTo, Aircraft Maintenance Log>
+<Mission Planning, partOf, Mission Planning>
+<Orbit Adjustment, connectedTo, Thermal Shield Testing>
+<Satellite Configuration, partOf, Satellite Configuration>
+<Satellite Configuration, prototypes, Telemetry Setup>
+<Space Debris Tracking, connectedTo, Airframe Assembly>
+<Space Debris Tracking, connectedTo, Spacecraft Telemetry Analysis>
+<Spacecraft Telemetry Analysis, connectedTo, Air Traffic Control Integration>
+<Spacecraft Telemetry Analysis, connectedTo, Ground Station Coordination>
+<Spacecraft Telemetry Analysis, connectedTo, Propulsion Testing>
+<Spacecraft Telemetry Analysis, connectedTo, Thermal Shield Testing>
+<Spacecraft Telemetry Analysis, coordinates, Orbit Adjustment>
+<Telemetry Setup, connectedTo, Component Recovery>
+<Telemetry Setup, connectedTo, Spacecraft Telemetry Analysis>
+<Thermal Shield Testing, connectedTo, Propulsion Testing>
diff --git a/test/graphviz/graph_hard/graphviz_6.txt b/test/graphviz/graph_hard/graphviz_6.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9e2fd7b3b79ed2ba1e30a59871e648d4940a70d7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_6.txt
@@ -0,0 +1,39 @@
+<Allergy Test, connectedTo, Patient Transfer>
+<Allergy Test, connectedTo, Surgery>
+<Case Review, connectedTo, Vaccination>
+<Case Review, partOf, Case Review>
+<Clinical Trial, connectedTo, Medication Dispensing>
+<Clinical Trial, connectedTo, Patient Transfer>
+<Clinical Trial, connectedTo, Rehabilitation Therapy>
+<Clinical Trial, connectedTo, Triage>
+<Discharge, connectedTo, Patient Intake>
+<Discharge, partOf, Discharge>
+<Home Care Visit, connectedTo, Nutritional Counseling>
+<Home Care Visit, connectedTo, Treatment Plan>
+<Imaging Scan, implements, Biopsy>
+<Medication Dispensing, connectedTo, Patient Transfer>
+<Medication Dispensing, connectedTo, Treatment Plan>
+<Mental Health Assessment, connectedTo, Imaging Scan>
+<Mental Health Assessment, connectedTo, Prescription>
+<Mental Health Assessment, connectedTo, Treatment Plan>
+<Mental Health Assessment, verifies, Treatment Plan>
+<Nutritional Counseling, connectedTo, Allergy Test>
+<Nutritional Counseling, connectedTo, Patient Transfer>
+<Pain Management, connectedTo, Mental Health Assessment>
+<Patient Intake, partOf, Patient Intake>
+<Patient Intake, schedules, Mental Health Assessment>
+<Patient Transfer, connectedTo, Pain Management>
+<Prescription, connectedTo, Treatment Plan>
+<Referral, connectedTo, Case Review>
+<Referral, partOf, Referral>
+<Rehabilitation Therapy, documents, Discharge>
+<Rehabilitation Therapy, partOf, Rehabilitation Therapy>
+<Surgery, connectedTo, Clinical Trial>
+<Surgery, connectedTo, Medication Dispensing>
+<Surgery, connectedTo, Pain Management>
+<Surgery, responds, Treatment Plan>
+<Treatment Plan, connectedTo, Imaging Scan>
+<Triage, connectedTo, Referral>
+<Triage, partOf, Triage>
+<Vaccination, connectedTo, Mental Health Assessment>
+<Vaccination, partOf, Vaccination>
diff --git a/test/graphviz/graph_hard/graphviz_62.txt b/test/graphviz/graph_hard/graphviz_62.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3aff7930f2ff302179f318ac3791e602ede4cbf2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_62.txt
@@ -0,0 +1,35 @@
+<Actuarial Analysis, connectedTo, Claim Adjustment>
+<Annuity Sales, connectedTo, Life Insurance Underwriting>
+<Auto Accident Claims, sells, Premium Calculation>
+<Claim Adjustment, connectedTo, Customer Communication>
+<Claim Adjustment, connectedTo, Investment Management for Reserves>
+<Claim Submission, connectedTo, Auto Accident Claims>
+<Claim Submission, partOf, Claim Submission>
+<Claims Litigation Management, connectedTo, Data Security>
+<Claims Litigation Management, connectedTo, Fraud Investigation>
+<Claims Litigation Management, connectedTo, Policy Renewal>
+<Customer Communication, secures, Data Security>
+<Customer Onboarding, connectedTo, Customer Support>
+<Customer Onboarding, partOf, Customer Onboarding>
+<Customer Support, connectedTo, Claim Submission>
+<Customer Support, partOf, Customer Support>
+<Data Security, connectedTo, Annuity Sales>
+<Fraud Investigation, connectedTo, Data Security>
+<Fraud Investigation, connectedTo, Policy Renewal>
+<Healthcare Provider Network Management, connectedTo, Annuity Sales>
+<Healthcare Provider Network Management, connectedTo, Claims Litigation Management>
+<Healthcare Provider Network Management, connectedTo, Data Security>
+<Healthcare Provider Network Management, connectedTo, Fraud Investigation>
+<Healthcare Provider Network Management, connectedTo, Life Insurance Underwriting>
+<Healthcare Provider Network Management, connectedTo, Policy Renewal>
+<Investment Management for Reserves, connectedTo, Underwriting>
+<Investment Management for Reserves, partOf, Investment Management for Reserves>
+<Life Insurance Underwriting, analyzes, Auto Accident Claims>
+<Policy Renewal, connectedTo, Annuity Sales>
+<Policy Renewal, connectedTo, Auto Accident Claims>
+<Policy Renewal, connectedTo, Customer Onboarding>
+<Policy Renewal, connectedTo, Life Insurance Underwriting>
+<Policy Renewal, investigates, Premium Calculation>
+<Policy Renewal, supports, Actuarial Analysis>
+<Underwriting, connectedTo, Claims Litigation Management>
+<Underwriting, partOf, Underwriting>
diff --git a/test/graphviz/graph_hard/graphviz_63.dot b/test/graphviz/graph_hard/graphviz_63.dot
new file mode 100644
index 0000000000000000000000000000000000000000..261016c8cd71c43bd21f832629e97fbda4564fc0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_63.dot
@@ -0,0 +1,78 @@
+digraph {
+	rankdir=BT
+	N0 [label="Premium Calculation" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Payment Processing" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N2 [label="Loss Prevention" color="#CB9BE1" fillcolor="#F2E6F5" shape=folder style=filled]
+	N3 [label="Claim Adjustment" color="#CB9BE1" fillcolor="#F2E6F5" shape=octagon style=filled]
+	N4 [label="Claims Litigation Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N5 [label="Catastrophe Modeling" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N6 [label="Coverage Review" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N7 [label="Actuarial Analysis" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N8 [label=Subrogation color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N9 [label="Investment Management for Reserves" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N10 [label="Product Development" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N11 [label="Policy Renewal" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N12 [label="Compliance Reporting" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N13 [label="Risk Assessment" color="#AF56A6" fillcolor="#DDCEDD" shape=oval style=filled]
+	N14 [label="Data Security" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N15 [label="Customer Onboarding" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Benefit Payout" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Customer Support" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+		nest0_1 [label="Policy Issuance" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest0_2 [label="Broker Management" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_3 [label="Annuity Sales" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Policy Application" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Telematics Data Analysis" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_1 [label="Auto Accident Claims" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_2 [label="Fraud Investigation" color="#AF56A6" fillcolor="#DDCEDD" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=documents color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N12 [label=mitigates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=supports color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_64.dot b/test/graphviz/graph_hard/graphviz_64.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e8491021782e66487a392da823b029f4d7f59273
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_64.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Vulnerability Assessment" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N1 [label="Backup and Recovery" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N2 [label="Threat Detection" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N3 [label="Risk Management Framework" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N4 [label="Compliance Monitoring" color="#FF8A65" fillcolor="#FBE9E7" shape=folder style=filled]
+	N5 [label="Web Application Firewall Deployment" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N6 [label="Security Audit" color="#CB9BE1" fillcolor="#F2E6F5" shape=octagon style=filled]
+	N7 [label="Cryptography Implementation" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N8 [label="Disaster Recovery Planning" color="#FFB2A5" fillcolor="#FFDCD6" shape=hexagon style=filled]
+	N9 [label="Security Policy Development" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N10 [label="DevSecOps Integration" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N11 [label="Security Awareness Training" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N12 [label="Dark Web Monitoring" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N13 [label="Insider Threat Detection" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N14 [label="Firewall Configuration" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N15 [label="Network Security" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Phishing Simulation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Physical Security Integration" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+		nest0_1 [label="Application Security" color="#FF8A65" fillcolor="#FBE9E7" shape=Mdiamond style=filled]
+		nest0_2 [label="Intrusion Prevention" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Threat Intelligence Gathering" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Digital Forensics" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+		nest1_1 [label="Zero Trust Architecture" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest1_2 [label="Identity Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=octagon style=filled]
+		nest1_3 [label="Antivirus Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+		nest1_0 -> nest1_1 [label=vulnerabilities color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [label=responds color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N13 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [label=monitors color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S2 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N11 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [label=patches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	M0 -> N15 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=audits color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_65.dot b/test/graphviz/graph_hard/graphviz_65.dot
new file mode 100644
index 0000000000000000000000000000000000000000..329701a63224bad51fad75c16aa0742977964ce4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_65.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="DevSecOps Integration" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label="Threat Detection" color="#61CAC3" fillcolor="#C2E8E6" shape=oval style=filled]
+	N2 [label="IoT Security" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N3 [label="Security Awareness Training" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N4 [label="Physical Security Integration" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+	N5 [label="Web Application Firewall Deployment" color="#DCE775" fillcolor="#FCFCE7" shape=Mdiamond style=filled]
+	N6 [label="Dark Web Monitoring" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N7 [label="Data Loss Prevention" color="#DCE775" fillcolor="#FCFCE7" shape=plaintext style=filled]
+	N8 [label="Security Audit" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N9 [label="Security Information and Event Management" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N10 [label="Network Security" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N11 [label="Security Patch Management" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N12 [label="Firewall Configuration" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N13 [label="Data Encryption" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Security Policy Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Backup and Recovery" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+		nest0_1 [label="Incident Response" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Insider Threat Detection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Malware Analysis" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_1 [label="Compliance Monitoring" color="#DCE775" fillcolor="#FCFCE7" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=integrates color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [label=secures color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N9 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [label=patches color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_65.txt b/test/graphviz/graph_hard/graphviz_65.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7366d04a21ec76079d72cd3124281a90d366ff5d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_65.txt
@@ -0,0 +1,36 @@
+<Backup and Recovery, connectedTo, Incident Response>
+<Backup and Recovery, partOf, Backup and Recovery>
+<Compliance Monitoring, connectedTo, Web Application Firewall Deployment>
+<Compliance Monitoring, partOf, Compliance Monitoring>
+<Dark Web Monitoring, connectedTo, Data Loss Prevention>
+<Dark Web Monitoring, connectedTo, Security Audit>
+<Dark Web Monitoring, secures, Backup and Recovery>
+<Data Loss Prevention, connectedTo, Data Encryption>
+<Data Loss Prevention, connectedTo, Firewall Configuration>
+<Data Loss Prevention, connectedTo, Security Audit>
+<Data Loss Prevention, connectedTo, Security Patch Management>
+<Data Loss Prevention, patches, Security Information and Event Management>
+<DevSecOps Integration, connectedTo, Physical Security Integration>
+<DevSecOps Integration, connectedTo, Threat Detection>
+<Firewall Configuration, connectedTo, Data Encryption>
+<Incident Response, connectedTo, IoT Security>
+<Incident Response, partOf, Incident Response>
+<IoT Security, connectedTo, Physical Security Integration>
+<IoT Security, connectedTo, Security Awareness Training>
+<Malware Analysis, connectedTo, Compliance Monitoring>
+<Malware Analysis, partOf, Malware Analysis>
+<Network Security, connectedTo, Security Patch Management>
+<Physical Security Integration, connectedTo, Web Application Firewall Deployment>
+<Security Audit, integrates, Security Information and Event Management>
+<Security Awareness Training, connectedTo, Malware Analysis>
+<Security Awareness Training, connectedTo, Physical Security Integration>
+<Security Awareness Training, connectedTo, Security Audit>
+<Security Information and Event Management, connectedTo, Data Encryption>
+<Security Information and Event Management, connectedTo, Firewall Configuration>
+<Security Information and Event Management, connectedTo, Network Security>
+<Security Information and Event Management, connectedTo, Security Patch Management>
+<Security Patch Management, connectedTo, Firewall Configuration>
+<Threat Detection, connectedTo, IoT Security>
+<Threat Detection, connectedTo, Physical Security Integration>
+<Web Application Firewall Deployment, connectedTo, Dark Web Monitoring>
+<Web Application Firewall Deployment, connectedTo, Security Audit>
diff --git a/test/graphviz/graph_hard/graphviz_67.dot b/test/graphviz/graph_hard/graphviz_67.dot
new file mode 100644
index 0000000000000000000000000000000000000000..72232d95a9f03a8a215f3c62e125ba79850a666d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_67.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Guest Access Management" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Voice Command" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N2 [label="Geofencing Trigger" color="#FFA726" fillcolor="#FFF3E0" shape=plaintext style=filled]
+	N3 [label="Scene Creation" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N4 [label="Personalized Comfort Settings" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Routine Scheduling" color="#FF9800" fillcolor="#FFE0B2" shape=Mdiamond style=filled]
+	N6 [label="Home Security System Activation" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N7 [label="Child Monitoring" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N8 [label="Energy Monitoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=diamond style=filled]
+	N9 [label="Smart Mirror Functionality" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N10 [label="Lighting Automation" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N11 [label="Door Lock Management" color="#FFA726" fillcolor="#FFF3E0" shape=plaintext style=filled]
+	N12 [label="Smart Plug Management" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N13 [label="Automated Vacuum Cleaning" color="#FF9800" fillcolor="#FFE0B2" shape=parallelogram style=filled]
+	N14 [label="Window Sensor Monitoring" color="#FF9800" fillcolor="#FFE0B2" shape=folder style=filled]
+	N15 [label="Pet Feeder Automation" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+	N16 [label="Power Outage Notification" color="#8C9EFF" fillcolor="#D3D7EB" shape=Mdiamond style=filled]
+	N17 [label="Remote Control" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+	N18 [label="Irrigation System Control" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+	N19 [label="Curtain Automation" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N20 [label="Firmware Update" color="#FFA726" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N21 [label="Sound System Integration" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Elderly Care Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Security Alert" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest0_1 [label="Thermostat Adjustment" color="#FFA726" fillcolor="#FFF3E0" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Smart Appliance Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Energy Consumption Optimization" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest1_1 [label="Video Surveillance" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=secures color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=installs color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=reports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N19 -> N20 [label=records color="#000000" dir=forward penwidth=1.5 style=solid]
+	N20 -> N21 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N16 -> nest0_0 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N20 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N17 -> nest1_0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N3 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [label=integrates color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N17 -> S1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N21 [label=streams color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S1 -> N20 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_67.txt b/test/graphviz/graph_hard/graphviz_67.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e005679efeea1bce2944f910175e24d567962980
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_67.txt
@@ -0,0 +1,38 @@
+<Automated Vacuum Cleaning, connectedTo, Window Sensor Monitoring>
+<Child Monitoring, connectedTo, Energy Monitoring>
+<Curtain Automation, records, Firmware Update>
+<Door Lock Management, connectedTo, Smart Plug Management>
+<Energy Consumption Optimization, partOf, Energy Consumption Optimization>
+<Energy Consumption Optimization, secures, Video Surveillance>
+<Energy Monitoring, connectedTo, Lighting Automation>
+<Energy Monitoring, connectedTo, Smart Mirror Functionality>
+<Firmware Update, connectedTo, Sound System Integration>
+<Geofencing Trigger, installs, Scene Creation>
+<Guest Access Management, connectedTo, Voice Command>
+<Home Security System Activation, connectedTo, Child Monitoring>
+<Home Security System Activation, connectedTo, Energy Monitoring>
+<Home Security System Activation, integrates, Window Sensor Monitoring>
+<Irrigation System Control, connectedTo, Curtain Automation>
+<Lighting Automation, connectedTo, Door Lock Management>
+<Personalized Comfort Settings, connectedTo, Lighting Automation>
+<Personalized Comfort Settings, connectedTo, Routine Scheduling>
+<Pet Feeder Automation, connectedTo, Power Outage Notification>
+<Power Outage Notification, connectedTo, Remote Control>
+<Power Outage Notification, connectedTo, Security Alert>
+<Remote Control, connectedTo, Energy Consumption Optimization>
+<Remote Control, connectedTo, Firmware Update>
+<Remote Control, connectedTo, Irrigation System Control>
+<Remote Control, streams, Sound System Integration>
+<Routine Scheduling, reports, Home Security System Activation>
+<Scene Creation, connectedTo, Lighting Automation>
+<Scene Creation, connectedTo, Personalized Comfort Settings>
+<Security Alert, connectedTo, Thermostat Adjustment>
+<Security Alert, partOf, Security Alert>
+<Smart Mirror Functionality, connectedTo, Lighting Automation>
+<Smart Plug Management, connectedTo, Automated Vacuum Cleaning>
+<Thermostat Adjustment, connectedTo, Firmware Update>
+<Thermostat Adjustment, partOf, Thermostat Adjustment>
+<Video Surveillance, connectedTo, Scene Creation>
+<Video Surveillance, partOf, Video Surveillance>
+<Voice Command, connectedTo, Geofencing Trigger>
+<Window Sensor Monitoring, connectedTo, Pet Feeder Automation>
diff --git a/test/graphviz/graph_hard/graphviz_69.dot b/test/graphviz/graph_hard/graphviz_69.dot
new file mode 100644
index 0000000000000000000000000000000000000000..725f7bc6d53a310c160d9f878dae21b2a02fa3ff
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_69.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=BT
+	N0 [label="Scene Creation" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N1 [label="Sound System Integration" color="#64B5F6" fillcolor="#E3F2FD" shape=folder style=filled]
+	N2 [label="Video Surveillance" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N3 [label="Smart Mirror Functionality" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N4 [label="Motion Detection" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Personalized Comfort Settings" color="#AED581" fillcolor="#F0F4C3" shape=Mdiamond style=filled]
+	N6 [label="Emergency Service Connection" color="#AED581" fillcolor="#F0F4C3" shape=folder style=filled]
+	N7 [label="Air Quality Monitoring" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N8 [label="Device Pairing" color="#FFF8A6" fillcolor="#FFFDE0" shape=oval style=filled]
+	N9 [label="Pet Feeder Automation" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Child Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Geofencing Trigger" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+		nest0_1 [label="Water Heater Control" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest0_2 [label="Routine Scheduling" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="App Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Window Sensor Monitoring" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_1 [label="Lighting Automation" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [label=monitors color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=warns color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N5 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S2 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_7.txt b/test/graphviz/graph_hard/graphviz_7.txt
new file mode 100644
index 0000000000000000000000000000000000000000..58227c7c5f6bcbc1b7c7ef8ab472d67f0cc6a5a8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_7.txt
@@ -0,0 +1,37 @@
+<Automated Guided Vehicle Operation, connectedTo, Recycling Process>
+<Bills of Material Generation, connectedTo, Product Design>
+<Bills of Material Generation, connectedTo, Serialization>
+<Defect Analysis, connectedTo, Ergonomics Assessment>
+<Factory Layout Planning, connectedTo, Welding>
+<Inspection, connectedTo, Defect Analysis>
+<Inspection, partOf, Inspection>
+<Logistics Planning, connectedTo, Quality Control>
+<Logistics Planning, connectedTo, Storage>
+<Logistics Planning, transports, Supply Chain Synchronization>
+<Maintenance, connectedTo, Serialization>
+<Maintenance, partOf, Maintenance>
+<Product Design, connectedTo, Inspection>
+<Product Design, partOf, Product Design>
+<Quality Control, connectedTo, Bills of Material Generation>
+<Recycling Process, connectedTo, Defect Analysis>
+<Recycling Process, connectedTo, Ergonomics Assessment>
+<Recycling Process, connectedTo, Work_in_Progress Monitoring>
+<Safety Audit, connectedTo, Maintenance>
+<Safety Audit, partOf, Safety Audit>
+<Serialization, connectedTo, Automated Guided Vehicle Operation>
+<Shipping, connectedTo, Logistics Planning>
+<Storage, connectedTo, Safety Audit>
+<Storage, partOf, Storage>
+<Supply Chain Synchronization, connectedTo, Automated Guided Vehicle Operation>
+<Supply Chain Synchronization, connectedTo, Bills of Material Generation>
+<Supply Chain Synchronization, connectedTo, Quality Control>
+<Supply Chain Synchronization, connectedTo, Serialization>
+<Welding, connectedTo, Quality Control>
+<Welding, connectedTo, Workflow Optimization>
+<Work_in_Progress Monitoring, connectedTo, Defect Analysis>
+<Workflow Optimization, connectedTo, Automated Guided Vehicle Operation>
+<Workflow Optimization, connectedTo, Recycling Process>
+<Workflow Optimization, connectedTo, Serialization>
+<Workflow Optimization, connectedTo, Shipping>
+<Yield Optimization, connectedTo, Factory Layout Planning>
+<Yield Optimization, connectedTo, Serialization>
diff --git a/test/graphviz/graph_hard/graphviz_70.dot b/test/graphviz/graph_hard/graphviz_70.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0dab6b09dd3a7c870d683a098630d2cb57d4c6d2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_70.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label="Predictive Maintenance for Utilities" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label="Smart Parking" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N2 [label="Air Quality Index Reporting" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N3 [label="Public Health Monitoring" color="#7E57C2" fillcolor="#EDE7F6" shape=folder style=filled]
+	N4 [label="Public Safety Monitoring" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N5 [label="City_wide Sensor Network Deployment" color="#7E57C2" fillcolor="#EDE7F6" shape=oval style=filled]
+	N6 [label="Waste Management Optimization" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N7 [label="Renewable Energy Integration" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Citizen Feedback Loop" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N9 [label="Urban Mobility Solutions" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Intelligent Public Safety Cameras" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Smart Building Integration" color="#7E57C2" fillcolor="#EDE7F6" shape=octagon style=filled]
+		nest0_1 [label="Environmental Sensor Network" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=regulates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Public Wi_Fi Deployment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Smart Water Meters" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest1_1 [label="Smart Lighting" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_0 -> nest1_1 [label=analyzes color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=transports color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=communicates color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [label=secures color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_70.txt b/test/graphviz/graph_hard/graphviz_70.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fc336e6a5a3f310d87dfdc11b4def70aad933c5e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_70.txt
@@ -0,0 +1,35 @@
+<Air Quality Index Reporting, connectedTo, Citizen Feedback Loop>
+<Air Quality Index Reporting, connectedTo, City_wide Sensor Network Deployment>
+<Air Quality Index Reporting, connectedTo, Public Health Monitoring>
+<Air Quality Index Reporting, connectedTo, Public Safety Monitoring>
+<Air Quality Index Reporting, connectedTo, Renewable Energy Integration>
+<Air Quality Index Reporting, connectedTo, Urban Mobility Solutions>
+<Citizen Feedback Loop, connectedTo, Urban Mobility Solutions>
+<City_wide Sensor Network Deployment, connectedTo, Waste Management Optimization>
+<Environmental Sensor Network, connectedTo, Renewable Energy Integration>
+<Environmental Sensor Network, partOf, Environmental Sensor Network>
+<Predictive Maintenance for Utilities, transports, Smart Parking>
+<Public Health Monitoring, connectedTo, Citizen Feedback Loop>
+<Public Health Monitoring, connectedTo, City_wide Sensor Network Deployment>
+<Public Health Monitoring, connectedTo, Public Safety Monitoring>
+<Public Health Monitoring, connectedTo, Renewable Energy Integration>
+<Public Health Monitoring, connectedTo, Urban Mobility Solutions>
+<Public Health Monitoring, secures, Renewable Energy Integration>
+<Public Safety Monitoring, communicates, City_wide Sensor Network Deployment>
+<Public Safety Monitoring, connectedTo, Citizen Feedback Loop>
+<Public Safety Monitoring, connectedTo, Renewable Energy Integration>
+<Public Safety Monitoring, connectedTo, Smart Building Integration>
+<Public Safety Monitoring, connectedTo, Smart Water Meters>
+<Public Safety Monitoring, connectedTo, Urban Mobility Solutions>
+<Public Safety Monitoring, connectedTo, Waste Management Optimization>
+<Renewable Energy Integration, connectedTo, Citizen Feedback Loop>
+<Smart Building Integration, partOf, Smart Building Integration>
+<Smart Building Integration, regulates, Environmental Sensor Network>
+<Smart Lighting, connectedTo, Air Quality Index Reporting>
+<Smart Lighting, partOf, Smart Lighting>
+<Smart Parking, connectedTo, Air Quality Index Reporting>
+<Smart Parking, connectedTo, Renewable Energy Integration>
+<Smart Water Meters, analyzes, Smart Lighting>
+<Smart Water Meters, partOf, Smart Water Meters>
+<Waste Management Optimization, connectedTo, Citizen Feedback Loop>
+<Waste Management Optimization, connectedTo, Renewable Energy Integration>
diff --git a/test/graphviz/graph_hard/graphviz_71.dot b/test/graphviz/graph_hard/graphviz_71.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2aa2737380d15f55cb7c8499094d1aeb9b32eea9
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_71.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=LR
+	N0 [label="Digital Kiosk Information" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Digital Twins of City" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+	N2 [label="Urban Mobility Solutions" color="#AED581" fillcolor="#F0F4C3" shape=parallelogram style=filled]
+	N3 [label="Renewable Energy Integration" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N4 [label="Smart Lighting" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N5 [label="Water Management System" color="#FFCC80" fillcolor="#FFF0CC" shape=folder style=filled]
+	N6 [label="Environmental Sensor Network" color="#FFCC80" fillcolor="#FFF0CC" shape=octagon style=filled]
+	N7 [label="Smart Building Integration" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N8 [label="Citizen Engagement Platform" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N9 [label="Public Wi_Fi Deployment" color="#CFCFCF" fillcolor="#F6F6F6" shape=folder style=filled]
+	N10 [label="Smart Water Meters" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N11 [label="Urban Agriculture Support" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N12 [label="Citizen Feedback Loop" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N13 [label="Smart Education Initiatives" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N14 [label="E_governance Services" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N15 [label="Energy Grid Management" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	S0 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CFCFCF" fillcolor="#F6F6F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Public Transport Tracking" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cybersecurity for Infrastructure" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+		nest0_1 [label="Waste Recycling Program" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+		nest0_2 [label="Sustainable Resource Management" color="#FFCC80" fillcolor="#FFF0CC" shape=oval style=filled]
+		nest0_3 [label="Green Space Management" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Smart Street Furniture" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Crowd Management" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+		nest1_1 [label="Intelligent Public Safety Cameras" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest1_2 [label="Traffic Flow Optimization" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=maintains color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N14 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_73.dot b/test/graphviz/graph_hard/graphviz_73.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7471a6211996c0990beaaf7be029919aeb66cb61
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_73.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Biomarker Discovery" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N1 [label="Environmental Bioremediation" color="#AABEC6" fillcolor="#E0E6E9" shape=diamond style=filled]
+	N2 [label="Diagnostic Test Development" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N3 [label="CRISPR Technology Application" color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+	N4 [label="Ethical Review Board Approval" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N5 [label="Biomanufacturing Scale_up" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N6 [label="Biosensor Development" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N7 [label="Tissue Engineering" color="#AABEC6" fillcolor="#E0E6E9" shape=hexagon style=filled]
+	N8 [label="Cell Culture" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N9 [label="Clinical Data Interpretation" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N10 [label="Bioprocess Optimization" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+	N11 [label="Drug Repurposing" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	S0 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Personalized Medicine Formulation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Pharmacogenomics color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+		nest0_1 [label="Nanobiotechnology Application" color="#AABEC6" fillcolor="#E0E6E9" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Preclinical Testing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Drug Discovery" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest1_1 [label="Intellectual Property Protection" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=validates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [label=processes color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label=optimizes color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [label=isolates color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_73.txt b/test/graphviz/graph_hard/graphviz_73.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f0e57afe1939e368d69fec465fdbfccd8c32c919
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_73.txt
@@ -0,0 +1,30 @@
+<Biomanufacturing Scale_up, connectedTo, Biosensor Development>
+<Biomanufacturing Scale_up, connectedTo, Clinical Data Interpretation>
+<Biomanufacturing Scale_up, optimizes, Cell Culture>
+<Biomarker Discovery, connectedTo, CRISPR Technology Application>
+<Biomarker Discovery, connectedTo, Cell Culture>
+<Biomarker Discovery, connectedTo, Environmental Bioremediation>
+<Bioprocess Optimization, connectedTo, Drug Repurposing>
+<Biosensor Development, connectedTo, Cell Culture>
+<Biosensor Development, connectedTo, Tissue Engineering>
+<Biosensor Development, processes, Drug Discovery>
+<CRISPR Technology Application, validates, Ethical Review Board Approval>
+<Cell Culture, connectedTo, Clinical Data Interpretation>
+<Cell Culture, connectedTo, Pharmacogenomics>
+<Clinical Data Interpretation, connectedTo, Bioprocess Optimization>
+<Diagnostic Test Development, connectedTo, CRISPR Technology Application>
+<Drug Discovery, connectedTo, Intellectual Property Protection>
+<Drug Discovery, partOf, Drug Discovery>
+<Environmental Bioremediation, connectedTo, CRISPR Technology Application>
+<Environmental Bioremediation, connectedTo, Diagnostic Test Development>
+<Ethical Review Board Approval, connectedTo, Biomanufacturing Scale_up>
+<Intellectual Property Protection, connectedTo, Drug Repurposing>
+<Intellectual Property Protection, partOf, Intellectual Property Protection>
+<Nanobiotechnology Application, connectedTo, Clinical Data Interpretation>
+<Nanobiotechnology Application, partOf, Nanobiotechnology Application>
+<Pharmacogenomics, connectedTo, Nanobiotechnology Application>
+<Pharmacogenomics, partOf, Pharmacogenomics>
+<Tissue Engineering, connectedTo, Bioprocess Optimization>
+<Tissue Engineering, connectedTo, Cell Culture>
+<Tissue Engineering, connectedTo, Drug Repurposing>
+<Tissue Engineering, isolates, Clinical Data Interpretation>
diff --git a/test/graphviz/graph_hard/graphviz_74.dot b/test/graphviz/graph_hard/graphviz_74.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2cda9616408504ec8babe46340965bb5f5fa49ef
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_74.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Management and Analysis" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N1 [label="Drug Repurposing" color="#94C0C0" fillcolor="#CADEDE" shape=parallelogram style=filled]
+	N2 [label="Gene Therapy Delivery" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N3 [label="Intellectual Property Protection" color="#CB9BE1" fillcolor="#F2E6F5" shape=Mdiamond style=filled]
+	N4 [label="Nanobiotechnology Application" color="#94C0C0" fillcolor="#CADEDE" shape=oval style=filled]
+	N5 [label="Quality Control" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N6 [label=Pharmacogenomics color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N7 [label="Clinical Data Interpretation" color="#CB9BE1" fillcolor="#F2E6F5" shape=folder style=filled]
+	N8 [label="Clinical Trial Design" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N9 [label="Biomarker Discovery" color="#94C0C0" fillcolor="#CADEDE" shape=parallelogram style=filled]
+	N10 [label="Assay Development" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N11 [label="Preclinical Testing" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Structural Biology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cell Culture" color="#94C0C0" fillcolor="#CADEDE" shape=octagon style=filled]
+		nest0_1 [label="Biomanufacturing Scale_up" color="#FF8A65" fillcolor="#FBE9E7" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Stem Cell Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Monoclonal Antibody Production" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest1_1 [label="Personalized Medicine Formulation" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_2 [label="Tissue Engineering" color="#94C0C0" fillcolor="#CADEDE" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=analyzes color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=automates color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N10 [label=ferments color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [label=applies color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [label=screens color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_76.txt b/test/graphviz/graph_hard/graphviz_76.txt
new file mode 100644
index 0000000000000000000000000000000000000000..20ffe0e3e8e54edd1e3b6030a238da0d6bef512f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_76.txt
@@ -0,0 +1,43 @@
+<Active Pharmaceutical Ingredient Production, monitors, Patient Adherence Programs>
+<Batch Release, connectedTo, Formulation Development>
+<Batch Release, connectedTo, Pharmacovigilance>
+<Biostatistics, connectedTo, Formulation Development>
+<Biostatistics, connectedTo, Preclinical Testing>
+<Cleanroom Operations, connectedTo, Patent Application>
+<Clinical Data Management, connectedTo, Cleanroom Operations>
+<Clinical Data Management, connectedTo, Quality Control>
+<Cold Chain Logistics, connectedTo, Medical Writing>
+<Compound Synthesis, connectedTo, Formulation Development>
+<Drug Device Combination, connectedTo, Process Validation>
+<Formulation Development, connectedTo, Clinical Data Management>
+<Global Regulatory Affairs, connectedTo, Manufacturing Scale_up>
+<Global Regulatory Affairs, partOf, Global Regulatory Affairs>
+<Good Manufacturing Practices, connectedTo, Preclinical Testing>
+<Good Manufacturing Practices, connectedTo, Supply Chain Management>
+<Manufacturing Scale_up, connectedTo, Good Manufacturing Practices>
+<Manufacturing Scale_up, partOf, Manufacturing Scale_up>
+<Market Access Strategy, connectedTo, Cleanroom Operations>
+<Market Access Strategy, partOf, Market Access Strategy>
+<Medical Writing, connectedTo, Sales and Marketing Strategy>
+<Packaging, connectedTo, Active Pharmaceutical Ingredient Production>
+<Patent Application, connectedTo, Solid Dosage Formulation>
+<Patient Adherence Programs, connectedTo, Cold Chain Logistics>
+<Pharmacovigilance, connectedTo, Compound Synthesis>
+<Pharmacovigilance, connectedTo, Global Regulatory Affairs>
+<Pharmacovigilance, connectedTo, Good Manufacturing Practices>
+<Pharmacovigilance, connectedTo, Preclinical Testing>
+<Preclinical Testing, connectedTo, Compound Synthesis>
+<Process Validation, connectedTo, Biostatistics>
+<Process Validation, connectedTo, Formulation Development>
+<Process Validation, connectedTo, Preclinical Testing>
+<Quality Control, connectedTo, Market Access Strategy>
+<Quality Control, partOf, Quality Control>
+<Solid Dosage Formulation, connectedTo, Active Pharmaceutical Ingredient Production>
+<Solid Dosage Formulation, connectedTo, Medical Writing>
+<Solid Dosage Formulation, connectedTo, Packaging>
+<Solid Dosage Formulation, connectedTo, Sales and Marketing Strategy>
+<Supply Chain Management, advises, Medical Writing>
+<Supply Chain Management, connectedTo, Biostatistics>
+<Supply Chain Management, connectedTo, Compound Synthesis>
+<Supply Chain Management, connectedTo, Drug Device Combination>
+<Supply Chain Management, connectedTo, Process Validation>
diff --git a/test/graphviz/graph_hard/graphviz_77.txt b/test/graphviz/graph_hard/graphviz_77.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4c7c4f420d0fb5334cc9e11d133693c7ee3b3e92
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_77.txt
@@ -0,0 +1,37 @@
+<Audit Management, connectedTo, Intellectual Property Litigation>
+<Audit Management, partOf, Audit Management>
+<Cleanroom Operations, connectedTo, Quality Control>
+<Clinical Data Management, connectedTo, Audit Management>
+<Clinical Data Management, connectedTo, Quality Control>
+<Clinical Data Management, synthesizes, Health Economics Outcomes Research>
+<Clinical Trial Phases, connectedTo, Cleanroom Operations>
+<Clinical Trial Phases, partOf, Clinical Trial Phases>
+<Distribution, connectedTo, Clinical Data Management>
+<Drug Stability Testing, partOf, Drug Stability Testing>
+<Drug Stability Testing, secures, Preclinical Testing>
+<Formulation Development, connectedTo, Packaging>
+<Formulation Development, connectedTo, Sterile Product Filling>
+<Global Regulatory Affairs, connectedTo, Health Economics Outcomes Research>
+<Global Regulatory Affairs, connectedTo, Medical Writing>
+<Global Regulatory Affairs, connectedTo, Packaging>
+<Global Regulatory Affairs, connectedTo, Quality Control>
+<Health Economics Outcomes Research, connectedTo, Preclinical Testing>
+<Intellectual Property Litigation, connectedTo, Regulatory Approval>
+<Intellectual Property Litigation, partOf, Intellectual Property Litigation>
+<Manufacturing Scale_up, advises, Drug Stability Testing>
+<Manufacturing Scale_up, partOf, Manufacturing Scale_up>
+<Medical Writing, connectedTo, Health Economics Outcomes Research>
+<Medical Writing, connectedTo, Packaging>
+<Packaging, connectedTo, Distribution>
+<Packaging, connectedTo, Health Economics Outcomes Research>
+<Preclinical Testing, connectedTo, Cleanroom Operations>
+<Preclinical Testing, connectedTo, Quality Control>
+<Quality Control, connectedTo, Active Pharmaceutical Ingredient Production>
+<Regulatory Approval, connectedTo, Clinical Trial Phases>
+<Regulatory Approval, partOf, Regulatory Approval>
+<Sterile Product Filling, connectedTo, Clinical Data Management>
+<Sterile Product Filling, connectedTo, Global Regulatory Affairs>
+<Sterile Product Filling, connectedTo, Health Economics Outcomes Research>
+<Sterile Product Filling, connectedTo, Manufacturing Scale_up>
+<Sterile Product Filling, connectedTo, Packaging>
+<Sterile Product Filling, evaluates, Cleanroom Operations>
diff --git a/test/graphviz/graph_hard/graphviz_79.txt b/test/graphviz/graph_hard/graphviz_79.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aa753d70962fbd5e62eb3ed5a8dfd0dd6a484f5c
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_79.txt
@@ -0,0 +1,49 @@
+<Actuator Control, automates, Wireless Communication>
+<Actuator Control, connectedTo, Collaborative Robotics>
+<Actuator Control, connectedTo, Sensor Integration>
+<Actuator Control, secures, Medical Robotics>
+<Agricultural Robotics, connectedTo, Learning Algorithms>
+<Agricultural Robotics, partOf, Agricultural Robotics>
+<Artificial Intelligence Integration, connectedTo, Exoskeleton Development>
+<Artificial Intelligence Integration, connectedTo, Fault Detection and Diagnosis>
+<Artificial Intelligence Integration, connectedTo, Robotics Simulation>
+<Calibration, connectedTo, Grasping and Manipulation>
+<Calibration, partOf, Calibration>
+<Collaborative Robotics, connectedTo, Medical Robotics>
+<Data Collection, connectedTo, End_Effector Design>
+<Drone Control, calibrates, Robot Assembly>
+<Drone Control, partOf, Drone Control>
+<End_Effector Design, connectedTo, Collaborative Robotics>
+<Exoskeleton Development, builds, Robot Assembly>
+<Exoskeleton Development, connectedTo, End_Effector Design>
+<Exoskeleton Development, connectedTo, Medical Robotics>
+<Exoskeleton Development, connectedTo, Sensor Integration>
+<Exploration Robotics, connectedTo, Collaborative Robotics>
+<Exploration Robotics, connectedTo, Exoskeleton Development>
+<Exploration Robotics, connectedTo, Field Deployment>
+<Fault Detection and Diagnosis, connectedTo, Agricultural Robotics>
+<Fault Detection and Diagnosis, partOf, Fault Detection and Diagnosis>
+<Field Deployment, avoids, Robot Assembly>
+<Field Deployment, connectedTo, Actuator Control>
+<Field Deployment, connectedTo, Medical Robotics>
+<Grasping and Manipulation, connectedTo, Maintenance>
+<Grasping and Manipulation, partOf, Grasping and Manipulation>
+<Kinematics and Dynamics, connectedTo, Exoskeleton Development>
+<Kinematics and Dynamics, connectedTo, Robot Fleet Management>
+<Learning Algorithms, connectedTo, Drone Control>
+<Learning Algorithms, partOf, Learning Algorithms>
+<Maintenance, partOf, Maintenance>
+<Maintenance, tests, Robot Design>
+<Path Planning, connectedTo, Calibration>
+<Path Planning, partOf, Path Planning>
+<Robot Assembly, connectedTo, Collaborative Robotics>
+<Robot Assembly, connectedTo, Sensor Integration>
+<Robot Design, connectedTo, Data Collection>
+<Robot Fleet Management, applies, Sensor Integration>
+<Robot Fleet Management, connectedTo, Artificial Intelligence Integration>
+<Robotics Simulation, connectedTo, Exploration Robotics>
+<Robotics Simulation, connectedTo, Sensor Integration>
+<Sensor Integration, connectedTo, Collaborative Robotics>
+<Sensor Integration, connectedTo, Robot Design>
+<Sensor Integration, moves, Path Planning>
+<Wireless Communication, connectedTo, Exoskeleton Development>
diff --git a/test/graphviz/graph_hard/graphviz_8.txt b/test/graphviz/graph_hard/graphviz_8.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9624372fe5b6f54e48b7b7c4d09fc07aedd5f823
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_8.txt
@@ -0,0 +1,31 @@
+<Batch Tracking, connectedTo, Work_in_Progress Monitoring>
+<Component Sourcing, connectedTo, Supply Chain Synchronization>
+<Component Sourcing, partOf, Component Sourcing>
+<Inspection, connectedTo, Supply Chain Synchronization>
+<Inspection, connectedTo, Work_in_Progress Monitoring>
+<Logistics Planning, connectedTo, Recycling Process>
+<Logistics Planning, partOf, Logistics Planning>
+<Machine Calibration, connectedTo, Product Design>
+<Machine Calibration, connectedTo, Workflow Optimization>
+<Machine Calibration, repairs, Packaging>
+<Packaging, connectedTo, Product Design>
+<Painting, connectedTo, Tool Setup>
+<Recycling Process, connectedTo, Component Sourcing>
+<Recycling Process, partOf, Recycling Process>
+<Safety Audit, connectedTo, Tool Path Generation>
+<Safety Audit, partOf, Safety Audit>
+<Supply Chain Synchronization, connectedTo, Batch Tracking>
+<Supply Chain Synchronization, connectedTo, Logistics Planning>
+<Supply Chain Synchronization, connectedTo, Packaging>
+<Supply Chain Synchronization, connectedTo, Product Design>
+<Supply Chain Synchronization, connectedTo, Safety Audit>
+<Supply Chain Synchronization, connectedTo, Work_in_Progress Monitoring>
+<Supply Chain Synchronization, optimizes, Work_in_Progress Monitoring>
+<Tool Path Generation, connectedTo, Tool Setup>
+<Tool Path Generation, partOf, Tool Path Generation>
+<Tool Setup, connectedTo, Inspection>
+<Tool Setup, connectedTo, Packaging>
+<Tool Setup, connectedTo, Product Design>
+<Tool Setup, connectedTo, Work_in_Progress Monitoring>
+<Work_in_Progress Monitoring, connectedTo, Machine Calibration>
+<Workflow Optimization, connectedTo, Packaging>
diff --git a/test/graphviz/graph_hard/graphviz_80.dot b/test/graphviz/graph_hard/graphviz_80.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c25bdf905c99471b00d4f75f609fbbeb8dd7a648
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_80.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=TD
+	N0 [label="Sensor Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Learning Algorithms" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N2 [label="Agricultural Robotics" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N3 [label="Underwater Robotics" color="#BDAFA8" fillcolor="#E4E0DF" shape=Mdiamond style=filled]
+	N4 [label="Grasping and Manipulation" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N5 [label="Robot Design" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N6 [label="Swarm Robotics" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N7 [label="Collaborative Robotics" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N8 [label="Artificial Intelligence Integration" color="#61CAC3" fillcolor="#C2E8E6" shape=folder style=filled]
+	N9 [label="Fault Detection and Diagnosis" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N10 [label="Kinematics and Dynamics" color="#9C27B0" fillcolor="#E1BEE7" shape=parallelogram style=filled]
+	N11 [label="Battery Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Software Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ethical Robotics Development" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+		nest0_1 [label="Drone Control" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+		nest0_2 [label="Machine Vision" color="#BDAFA8" fillcolor="#E4E0DF" shape=oval style=filled]
+		nest0_0 -> nest0_1 [label=simulates color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Embedded Systems Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Exploration Robotics" color="#61CAC3" fillcolor="#C2E8E6" shape=octagon style=filled]
+		nest1_1 [label=Calibration color="#9C27B0" fillcolor="#E1BEE7" shape=Mdiamond style=filled]
+		nest1_2 [label="Industrial Automation" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=tests color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_80.txt b/test/graphviz/graph_hard/graphviz_80.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c8e3ee38ffe355acde9425eee818846238aad3c7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_80.txt
@@ -0,0 +1,35 @@
+<Agricultural Robotics, connectedTo, Exploration Robotics>
+<Agricultural Robotics, connectedTo, Grasping and Manipulation>
+<Agricultural Robotics, connectedTo, Underwater Robotics>
+<Artificial Intelligence Integration, connectedTo, Battery Management>
+<Artificial Intelligence Integration, connectedTo, Fault Detection and Diagnosis>
+<Artificial Intelligence Integration, connectedTo, Kinematics and Dynamics>
+<Calibration, connectedTo, Industrial Automation>
+<Calibration, partOf, Calibration>
+<Collaborative Robotics, connectedTo, Artificial Intelligence Integration>
+<Drone Control, connectedTo, Machine Vision>
+<Drone Control, partOf, Drone Control>
+<Ethical Robotics Development, partOf, Ethical Robotics Development>
+<Ethical Robotics Development, simulates, Drone Control>
+<Exploration Robotics, partOf, Exploration Robotics>
+<Exploration Robotics, tests, Calibration>
+<Fault Detection and Diagnosis, connectedTo, Kinematics and Dynamics>
+<Grasping and Manipulation, connectedTo, Collaborative Robotics>
+<Grasping and Manipulation, connectedTo, Ethical Robotics Development>
+<Grasping and Manipulation, connectedTo, Fault Detection and Diagnosis>
+<Grasping and Manipulation, connectedTo, Robot Design>
+<Industrial Automation, connectedTo, Underwater Robotics>
+<Industrial Automation, partOf, Industrial Automation>
+<Kinematics and Dynamics, connectedTo, Battery Management>
+<Learning Algorithms, connectedTo, Agricultural Robotics>
+<Learning Algorithms, connectedTo, Battery Management>
+<Learning Algorithms, connectedTo, Collaborative Robotics>
+<Learning Algorithms, connectedTo, Grasping and Manipulation>
+<Learning Algorithms, connectedTo, Robot Design>
+<Machine Vision, connectedTo, Agricultural Robotics>
+<Machine Vision, partOf, Machine Vision>
+<Robot Design, connectedTo, Swarm Robotics>
+<Sensor Integration, connectedTo, Grasping and Manipulation>
+<Sensor Integration, connectedTo, Learning Algorithms>
+<Swarm Robotics, connectedTo, Collaborative Robotics>
+<Underwater Robotics, connectedTo, Grasping and Manipulation>
diff --git a/test/graphviz/graph_hard/graphviz_81.dot b/test/graphviz/graph_hard/graphviz_81.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d3c606723e02dd6c52e9d6046ae30ac3b05fb7ca
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_81.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Robotics Simulation" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label=Maintenance color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N2 [label="Software Development" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N3 [label="Performance Testing" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N4 [label="Exoskeleton Development" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N5 [label="Kinematics and Dynamics" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+	N6 [label="Medical Robotics" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N7 [label=Calibration color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N8 [label="Drone Control" color="#F44336" fillcolor="#FFCDD2" shape=diamond style=filled]
+	N9 [label="Service Robotics" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N10 [label="Data Collection" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	S0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Learning Algorithms" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ethical Robotics Development" color="#F44336" fillcolor="#FFCDD2" shape=plaintext style=filled]
+		nest0_1 [label="Actuator Control" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=repairs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Robot Assembly" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Autonomous Navigation" color="#FFF176" fillcolor="#FFFDE7" shape=plaintext style=filled]
+		nest1_1 [label="Grasping and Manipulation" color="#FFF176" fillcolor="#FFFDE7" shape=folder style=filled]
+		nest1_2 [label="Robot Programming" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [label=maintains color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=avoids color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest0_0 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label=updates color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_81.txt b/test/graphviz/graph_hard/graphviz_81.txt
new file mode 100644
index 0000000000000000000000000000000000000000..67c205036a8f2a6f4cdea417355d918374b835e0
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_81.txt
@@ -0,0 +1,32 @@
+<Actuator Control, connectedTo, Exoskeleton Development>
+<Actuator Control, partOf, Actuator Control>
+<Autonomous Navigation, connectedTo, Grasping and Manipulation>
+<Autonomous Navigation, partOf, Autonomous Navigation>
+<Calibration, connectedTo, Drone Control>
+<Drone Control, connectedTo, Service Robotics>
+<Ethical Robotics Development, partOf, Ethical Robotics Development>
+<Ethical Robotics Development, repairs, Actuator Control>
+<Exoskeleton Development, connectedTo, Drone Control>
+<Exoskeleton Development, connectedTo, Kinematics and Dynamics>
+<Grasping and Manipulation, maintains, Robot Programming>
+<Grasping and Manipulation, partOf, Grasping and Manipulation>
+<Kinematics and Dynamics, connectedTo, Drone Control>
+<Kinematics and Dynamics, connectedTo, Medical Robotics>
+<Kinematics and Dynamics, connectedTo, Service Robotics>
+<Kinematics and Dynamics, updates, Calibration>
+<Maintenance, avoids, Software Development>
+<Maintenance, connectedTo, Calibration>
+<Medical Robotics, connectedTo, Autonomous Navigation>
+<Medical Robotics, connectedTo, Calibration>
+<Performance Testing, connectedTo, Calibration>
+<Performance Testing, connectedTo, Exoskeleton Development>
+<Robot Programming, connectedTo, Kinematics and Dynamics>
+<Robot Programming, partOf, Robot Programming>
+<Robotics Simulation, connectedTo, Drone Control>
+<Robotics Simulation, connectedTo, Exoskeleton Development>
+<Robotics Simulation, connectedTo, Maintenance>
+<Robotics Simulation, connectedTo, Medical Robotics>
+<Robotics Simulation, connectedTo, Performance Testing>
+<Service Robotics, connectedTo, Data Collection>
+<Service Robotics, connectedTo, Ethical Robotics Development>
+<Software Development, connectedTo, Performance Testing>
diff --git a/test/graphviz/graph_hard/graphviz_82.dot b/test/graphviz/graph_hard/graphviz_82.dot
new file mode 100644
index 0000000000000000000000000000000000000000..00d96329b79b869328f8be1b4f7b03ea22acd436
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_82.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=RL
+	N0 [label="Risk Assessment" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Waste Management" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N2 [label="Project Scheduling" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N3 [label="Steel Erection" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N4 [label="Foundation Laying" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N5 [label="Plumbing Work" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N6 [label=Demolition color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N7 [label="Budget Tracking" color="#F44336" fillcolor="#FFCDD2" shape=Mdiamond style=filled]
+	N8 [label="Bridge Building" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+	N9 [label="Road Construction" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N10 [label="Blueprint Review" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N11 [label="Punch List Completion" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N12 [label="Subcontractor Management" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+	N13 [label="Safety Inspection" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N14 [label="Material Procurement" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N15 [label="Sustainable Building Design" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N16 [label="Equipment Mobilization" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	S0 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F44336" fillcolor="#FFCDD2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label=Tunneling labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quality Assurance" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_1 [label=Excavation color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+		nest0_2 [label="Robotics in Construction" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+		nest0_3 [label=Pre_fabrication color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Structural Framing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Facade Installation" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+		nest1_1 [label="Landscape Design" color="#F44336" fillcolor="#FFCDD2" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=manages color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=advises color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=demolishes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=audits color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [label=materials color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N10 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M1 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_83.txt b/test/graphviz/graph_hard/graphviz_83.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1dfa68c704c56148281a7037036d19c05a5d981d
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_83.txt
@@ -0,0 +1,41 @@
+<Bridge Building, connectedTo, Interior Finishing>
+<Budget Tracking, connectedTo, Bridge Building>
+<Budget Tracking, connectedTo, Interior Finishing>
+<Budget Tracking, connectedTo, Site Planning>
+<Budget Tracking, connectedTo, Waste Management>
+<Change Order Management, connectedTo, Utility Connection>
+<Change Order Management, partOf, Change Order Management>
+<Concrete Pouring, connectedTo, Sustainable Building Design>
+<Demolition, connectedTo, Drone Surveying>
+<Demolition, partOf, Demolition>
+<Drone Surveying, connectedTo, Excavation>
+<Drone Surveying, partOf, Drone Surveying>
+<Equipment Mobilization, connectedTo, Safety Inspection>
+<Equipment Mobilization, partOf, Equipment Mobilization>
+<Excavation, connectedTo, Equipment Mobilization>
+<Excavation, partOf, Excavation>
+<Foundation Laying, connectedTo, Bridge Building>
+<Foundation Laying, connectedTo, Punch List Completion>
+<Foundation Laying, connectedTo, Site Planning>
+<HVAC Installation, connectedTo, Interior Finishing>
+<HVAC Installation, partOf, HVAC Installation>
+<Interior Finishing, connectedTo, Concrete Pouring>
+<Interior Finishing, connectedTo, Demolition>
+<Permit Application, connectedTo, HVAC Installation>
+<Permit Application, partOf, Permit Application>
+<Project Scheduling, connectedTo, Bridge Building>
+<Project Scheduling, connectedTo, Interior Finishing>
+<Project Scheduling, connectedTo, Site Decontamination>
+<Project Scheduling, connectedTo, Site Planning>
+<Punch List Completion, connectedTo, Bridge Building>
+<Punch List Completion, plans, Safety Inspection>
+<Robotics in Construction, constructs, Risk Assessment>
+<Safety Inspection, connectedTo, Budget Tracking>
+<Site Decontamination, connectedTo, Bridge Building>
+<Site Decontamination, connectedTo, Change Order Management>
+<Site Planning, connectedTo, Site Decontamination>
+<Sustainable Building Design, connectedTo, Robotics in Construction>
+<Utility Connection, connectedTo, Permit Application>
+<Utility Connection, partOf, Utility Connection>
+<Waste Management, connectedTo, Site Planning>
+<Waste Management, grades, Project Scheduling>
diff --git a/test/graphviz/graph_hard/graphviz_84.txt b/test/graphviz/graph_hard/graphviz_84.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d3d6fd836bb06de17ea916fa700b556c16441dd4
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_84.txt
@@ -0,0 +1,31 @@
+<Bridge Building, connectedTo, Permit Application>
+<Demolition, connectedTo, Post_Construction Handover>
+<Demolition, partOf, Demolition>
+<Equipment Mobilization, connectedTo, Risk Assessment>
+<Equipment Mobilization, connectedTo, Road Construction>
+<Foundation Laying, connectedTo, Equipment Mobilization>
+<Foundation Laying, connectedTo, Risk Assessment>
+<Foundation Laying, connectedTo, Subcontractor Management>
+<Occupancy Permit Acquisition, partOf, Occupancy Permit Acquisition>
+<Occupancy Permit Acquisition, reports, Site Decontamination>
+<Permit Application, connectedTo, Foundation Laying>
+<Post_Construction Handover, connectedTo, Equipment Mobilization>
+<Post_Construction Handover, connectedTo, Risk Assessment>
+<Post_Construction Handover, connectedTo, Subcontractor Management>
+<Post_Construction Handover, connectedTo, Waste Management>
+<Quality Assurance, connectedTo, Demolition>
+<Quality Assurance, partOf, Quality Assurance>
+<Road Construction, connectedTo, Occupancy Permit Acquisition>
+<Road Construction, partOf, Road Construction>
+<Roofing Installation, connectedTo, Equipment Mobilization>
+<Roofing Installation, connectedTo, Post_Construction Handover>
+<Roofing Installation, connectedTo, Risk Assessment>
+<Safety Inspection, connectedTo, Site Planning>
+<Safety Inspection, partOf, Safety Inspection>
+<Site Decontamination, connectedTo, Risk Assessment>
+<Site Decontamination, partOf, Site Decontamination>
+<Site Planning, connectedTo, Quality Assurance>
+<Site Planning, partOf, Site Planning>
+<Subcontractor Management, connectedTo, Equipment Mobilization>
+<Subcontractor Management, connectedTo, Safety Inspection>
+<Waste Management, connectedTo, Bridge Building>
diff --git a/test/graphviz/graph_hard/graphviz_85.dot b/test/graphviz/graph_hard/graphviz_85.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0e89f749a9aefd765143813a622702e1e3948dbb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_85.dot
@@ -0,0 +1,71 @@
+digraph {
+	rankdir=TD
+	N0 [label="Platform Development" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label=Distribution color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N2 [label="Music Recording" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N3 [label=Broadcasting color="#94C0C0" fillcolor="#CADEDE" shape=plaintext style=filled]
+	N4 [label="Data Monetization" color="#FFC2C2" fillcolor="#FFEBEB" shape=octagon style=filled]
+	N5 [label="Podcast Production" color="#CDDC39" fillcolor="#E6EE9C" shape=Mdiamond style=filled]
+	N6 [label="Audience Segmentation" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N7 [label="Visual Effects" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N8 [label="Event Organization" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N9 [label=Editing color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N10 [label="Social Media Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N11 [label=Publishing color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N12 [label="Crisis Communication" color="#FFC2C2" fillcolor="#FFEBEB" shape=folder style=filled]
+	N13 [label="Talent Management" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N14 [label="Live Streaming" color="#CDDC39" fillcolor="#E6EE9C" shape=parallelogram style=filled]
+	N15 [label="Game Streaming" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Virtual Reality Content Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Advertising Sales" color="#94C0C0" fillcolor="#CADEDE" shape=oval style=filled]
+		nest0_1 [label="Public Relations" color="#94C0C0" fillcolor="#CADEDE" shape=octagon style=filled]
+		nest0_2 [label="Content Creation" color="#CDDC39" fillcolor="#E6EE9C" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Media Consumption Trends Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Photojournalism color="#CDDC39" fillcolor="#E6EE9C" shape=octagon style=filled]
+		nest1_1 [label="Content Licensing" color="#94C0C0" fillcolor="#CADEDE" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N8 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [label=promotes color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N11 -> M1 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N13 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_85.txt b/test/graphviz/graph_hard/graphviz_85.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9af79a1b13fc5a94eeffb78ca6f10b15dd655378
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_85.txt
@@ -0,0 +1,36 @@
+<Advertising Sales, connectedTo, Public Relations>
+<Advertising Sales, partOf, Advertising Sales>
+<Audience Segmentation, connectedTo, Event Organization>
+<Audience Segmentation, connectedTo, Visual Effects>
+<Broadcasting, connectedTo, Data Monetization>
+<Content Creation, connectedTo, Talent Management>
+<Content Creation, partOf, Content Creation>
+<Content Licensing, connectedTo, Event Organization>
+<Content Licensing, partOf, Content Licensing>
+<Crisis Communication, connectedTo, Live Streaming>
+<Crisis Communication, connectedTo, Talent Management>
+<Crisis Communication, promotes, Game Streaming>
+<Data Monetization, connectedTo, Podcast Production>
+<Distribution, connectedTo, Music Recording>
+<Distribution, connectedTo, Talent Management>
+<Editing, connectedTo, Photojournalism>
+<Editing, connectedTo, Social Media Management>
+<Editing, connectedTo, Talent Management>
+<Event Organization, connectedTo, Editing>
+<Live Streaming, connectedTo, Game Streaming>
+<Music Recording, connectedTo, Broadcasting>
+<Photojournalism, connectedTo, Content Licensing>
+<Photojournalism, partOf, Photojournalism>
+<Platform Development, connectedTo, Distribution>
+<Platform Development, connectedTo, Event Organization>
+<Podcast Production, connectedTo, Audience Segmentation>
+<Podcast Production, connectedTo, Crisis Communication>
+<Podcast Production, connectedTo, Live Streaming>
+<Public Relations, connectedTo, Content Creation>
+<Public Relations, partOf, Public Relations>
+<Publishing, connectedTo, Crisis Communication>
+<Publishing, connectedTo, Talent Management>
+<Social Media Management, connectedTo, Advertising Sales>
+<Social Media Management, connectedTo, Publishing>
+<Talent Management, connectedTo, Live Streaming>
+<Visual Effects, connectedTo, Event Organization>
diff --git a/test/graphviz/graph_hard/graphviz_87.dot b/test/graphviz/graph_hard/graphviz_87.dot
new file mode 100644
index 0000000000000000000000000000000000000000..596724811be699e84e123e076d577b232f13d6ff
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_87.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=LR
+	N0 [label="User Generated Content Curation" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Event Organization" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N2 [label=Publishing color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N3 [label=Scriptwriting color="#FFC107" fillcolor="#FFECB3" shape=octagon style=filled]
+	N4 [label="Podcast Production" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N5 [label="Copyright Management" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N6 [label="Talent Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=folder style=filled]
+	N7 [label="Social Media Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N8 [label="Subscription Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label=Photojournalism labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Broadcasting color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+		nest0_1 [label="Live Streaming" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Music Recording" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Monetization" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+		nest1_1 [label="Audience Engagement" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest1_2 [label="Media Consumption Trends Analysis" color="#FFC107" fillcolor="#FFECB3" shape=oval style=filled]
+		nest1_3 [label="Content Moderation" color="#B0C5CD" fillcolor="#DFE7EB" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N2 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_87.txt b/test/graphviz/graph_hard/graphviz_87.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e07225427b21f0292c04d0771505293130a7c2c8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_87.txt
@@ -0,0 +1,32 @@
+<Audience Engagement, connectedTo, Media Consumption Trends Analysis>
+<Audience Engagement, partOf, Audience Engagement>
+<Broadcasting, connectedTo, Live Streaming>
+<Broadcasting, partOf, Broadcasting>
+<Content Moderation, connectedTo, Publishing>
+<Content Moderation, partOf, Content Moderation>
+<Copyright Management, connectedTo, Social Media Management>
+<Copyright Management, connectedTo, Subscription Management>
+<Copyright Management, connectedTo, Talent Management>
+<Data Monetization, connectedTo, Audience Engagement>
+<Data Monetization, partOf, Data Monetization>
+<Event Organization, connectedTo, Copyright Management>
+<Event Organization, connectedTo, Publishing>
+<Event Organization, connectedTo, Scriptwriting>
+<Event Organization, connectedTo, Social Media Management>
+<Live Streaming, connectedTo, Copyright Management>
+<Live Streaming, partOf, Live Streaming>
+<Media Consumption Trends Analysis, connectedTo, Content Moderation>
+<Media Consumption Trends Analysis, partOf, Media Consumption Trends Analysis>
+<Podcast Production, connectedTo, Copyright Management>
+<Podcast Production, connectedTo, Social Media Management>
+<Podcast Production, connectedTo, Subscription Management>
+<Podcast Production, connectedTo, Talent Management>
+<Publishing, connectedTo, Scriptwriting>
+<Scriptwriting, connectedTo, Broadcasting>
+<Scriptwriting, connectedTo, Copyright Management>
+<Scriptwriting, connectedTo, Data Monetization>
+<Scriptwriting, connectedTo, Podcast Production>
+<Social Media Management, connectedTo, Subscription Management>
+<Talent Management, connectedTo, Social Media Management>
+<User Generated Content Curation, connectedTo, Event Organization>
+<User Generated Content Curation, connectedTo, Scriptwriting>
diff --git a/test/graphviz/graph_hard/graphviz_88.dot b/test/graphviz/graph_hard/graphviz_88.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0897cb3a72b7cb5fb719d59ad6744cab71bf472e
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_88.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Ingredient Traceability" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N1 [label="Supplier Management" color="#73C6BC" fillcolor="#D0EFEE" shape=parallelogram style=filled]
+	N2 [label="Service Delivery" color="#FBC02D" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+	N3 [label="Customer Order Taking" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N4 [label="Recipe Development" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N5 [label="Consumer Feedback Collection" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N6 [label="Storage Solutions" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N7 [label="Sensory Evaluation" color="#E91E63" fillcolor="#F8BBD0" shape=folder style=filled]
+	N8 [label="New Product Launch" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N9 [label="Inventory Management" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N10 [label="Menu Planning" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+	N11 [label="Food Waste Management System" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N12 [label="Supply Chain Traceability" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N13 [label=Cooking color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	S1 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label=Brewing labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Catering Operations" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_1 [label="Waste Reduction" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest0_2 [label="Cuisine Innovation" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+		nest0_3 [label="Dietary Requirement Accommodation" color="#FBC02D" fillcolor="#FFFDE7" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Regulatory Compliance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Restaurant Management" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+		nest1_1 [label="Food Packaging Design" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest1_2 [label="Sustainable Sourcing" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=cooks color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=harvests color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [label=serves color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N1 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N3 [label=develops color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_88.txt b/test/graphviz/graph_hard/graphviz_88.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2cd00c21bf7a50523b698c2434dde434ce8ddbd7
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_88.txt
@@ -0,0 +1,38 @@
+<Catering Operations, connectedTo, Waste Reduction>
+<Catering Operations, partOf, Catering Operations>
+<Consumer Feedback Collection, connectedTo, Menu Planning>
+<Consumer Feedback Collection, connectedTo, Storage Solutions>
+<Cuisine Innovation, connectedTo, Dietary Requirement Accommodation>
+<Cuisine Innovation, partOf, Cuisine Innovation>
+<Customer Order Taking, connectedTo, Catering Operations>
+<Customer Order Taking, connectedTo, Recipe Development>
+<Dietary Requirement Accommodation, connectedTo, Service Delivery>
+<Dietary Requirement Accommodation, connectedTo, Supplier Management>
+<Dietary Requirement Accommodation, partOf, Dietary Requirement Accommodation>
+<Food Packaging Design, connectedTo, Sustainable Sourcing>
+<Food Packaging Design, partOf, Food Packaging Design>
+<Food Waste Management System, connectedTo, Supply Chain Traceability>
+<Ingredient Traceability, connectedTo, Supplier Management>
+<Inventory Management, connectedTo, Cooking>
+<Inventory Management, connectedTo, Food Waste Management System>
+<Inventory Management, connectedTo, Menu Planning>
+<Menu Planning, connectedTo, Food Waste Management System>
+<New Product Launch, connectedTo, Inventory Management>
+<Recipe Development, connectedTo, Consumer Feedback Collection>
+<Restaurant Management, connectedTo, Food Packaging Design>
+<Restaurant Management, partOf, Restaurant Management>
+<Sensory Evaluation, connectedTo, New Product Launch>
+<Service Delivery, connectedTo, Menu Planning>
+<Service Delivery, cooks, Customer Order Taking>
+<Storage Solutions, connectedTo, Restaurant Management>
+<Storage Solutions, harvests, Sensory Evaluation>
+<Supplier Management, connectedTo, Menu Planning>
+<Supplier Management, connectedTo, New Product Launch>
+<Supplier Management, connectedTo, Recipe Development>
+<Supplier Management, connectedTo, Service Delivery>
+<Supplier Management, develops, Customer Order Taking>
+<Supply Chain Traceability, serves, Cooking>
+<Sustainable Sourcing, connectedTo, Supply Chain Traceability>
+<Sustainable Sourcing, partOf, Sustainable Sourcing>
+<Waste Reduction, connectedTo, Cuisine Innovation>
+<Waste Reduction, partOf, Waste Reduction>
diff --git a/test/graphviz/graph_hard/graphviz_89.dot b/test/graphviz/graph_hard/graphviz_89.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ff72485cc6252f07236d31a7d3245a2c44c7fc2f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_89.dot
@@ -0,0 +1,52 @@
+digraph {
+	rankdir=RL
+	N0 [label="Restaurant Reservation System" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label=Brewing color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N2 [label="Food Waste Management System" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N3 [label="Waste Reduction" color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+	N4 [label="Customer Order Taking" color="#FF5722" fillcolor="#FFCCBC" shape=diamond style=filled]
+	N5 [label="Regulatory Compliance" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N6 [label="Inventory Management" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N7 [label="Dietary Requirement Accommodation" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Food Packaging Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Ingredient Traceability" color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+		nest0_1 [label="Catering Operations" color="#FF5722" fillcolor="#FFCCBC" shape=Mdiamond style=filled]
+		nest0_2 [label="Delivery Service Coordination" color="#FFCC7A" fillcolor="#FFF6D9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Food Safety Inspection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Supplier Management" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+		nest1_1 [label="Quality Control" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest1_2 [label=Baking color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+		nest1_3 [label="Recipe Development" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=preserves color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [label=distributes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_90.txt b/test/graphviz/graph_hard/graphviz_90.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4c0dbe66df95793481126189be54b80e5380b345
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_90.txt
@@ -0,0 +1,45 @@
+<Baking, connectedTo, Sustainable Sourcing>
+<Baking, partOf, Baking>
+<Beverage Production, connectedTo, Food Preservation>
+<Beverage Production, partOf, Beverage Production>
+<Branding and Marketing, connectedTo, Ingredient Sourcing>
+<Branding and Marketing, connectedTo, Storage Solutions>
+<Brewing, connectedTo, New Product Launch>
+<Brewing, freezes, Food Safety Inspection>
+<Consumer Feedback Collection, connectedTo, Cooking>
+<Consumer Feedback Collection, connectedTo, Kitchen Hygiene>
+<Cooking, connectedTo, Food Packaging Design>
+<Cooking, connectedTo, Kitchen Hygiene>
+<Cooking, connectedTo, Sensory Evaluation>
+<Cooking, connectedTo, Storage Solutions>
+<Cooking, grows, Restaurant Reservation System>
+<Cuisine Innovation, connectedTo, Kitchen Hygiene>
+<Customer Order Taking, connectedTo, Brewing>
+<Customer Order Taking, connectedTo, Cuisine Innovation>
+<Customer Order Taking, connectedTo, Food Packaging Design>
+<Customer Order Taking, connectedTo, Kitchen Hygiene>
+<Customer Order Taking, connectedTo, Quality Control>
+<Dietary Requirement Accommodation, connectedTo, Menu Planning>
+<Dietary Requirement Accommodation, partOf, Dietary Requirement Accommodation>
+<Food Packaging Design, connectedTo, Food Safety Inspection>
+<Food Packaging Design, connectedTo, Quality Control>
+<Food Preservation, connectedTo, Baking>
+<Food Preservation, partOf, Food Preservation>
+<Food Safety Inspection, connectedTo, Branding and Marketing>
+<Food Waste Management System, connectedTo, Brewing>
+<Ingredient Sourcing, connectedTo, Dietary Requirement Accommodation>
+<Ingredient Sourcing, partOf, Ingredient Sourcing>
+<Kitchen Hygiene, nutrifies, Service Delivery>
+<Menu Planning, connectedTo, Storage Solutions>
+<Menu Planning, partOf, Menu Planning>
+<New Product Launch, connectedTo, Food Packaging Design>
+<Quality Control, connectedTo, Beverage Production>
+<Quality Control, connectedTo, Branding and Marketing>
+<Quality Control, connectedTo, Sensory Evaluation>
+<Quality Control, connectedTo, Storage Solutions>
+<Restaurant Reservation System, connectedTo, Customer Order Taking>
+<Restaurant Reservation System, connectedTo, Kitchen Hygiene>
+<Sensory Evaluation, connectedTo, Food Safety Inspection>
+<Service Delivery, connectedTo, Food Waste Management System>
+<Sustainable Sourcing, connectedTo, Cooking>
+<Sustainable Sourcing, partOf, Sustainable Sourcing>
diff --git a/test/graphviz/graph_hard/graphviz_91.dot b/test/graphviz/graph_hard/graphviz_91.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ff4c6ea08211dc49ab8410252cf2ff263e7dbd7f
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_91.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=TD
+	N0 [label=Scorekeeping color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Injury Management" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N2 [label="Sports Marketing" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N3 [label="Esports Event Management" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N4 [label="Player Recruitment" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N5 [label="Youth Development Programs" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N6 [label="Sports Psychology" color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+	N7 [label="Anti_Doping Control" color="#4CAF50" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N8 [label=Refereeing color="#A2D0FF" fillcolor="#E8F0FF" shape=Mdiamond style=filled]
+	N9 [label="Game Strategy" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N10 [label="Fitness Conditioning" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N11 [label="Fan Engagement" color="#A2D0FF" fillcolor="#E8F0FF" shape=plaintext style=filled]
+	N12 [label="Sports Medicine" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N13 [label="Tournament Organization" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N14 [label="Fan Club Management" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N15 [label="Rule Enforcement" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N16 [label="Athlete Performance Tracking" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N17 [label="Media Rights Negotiation" color="#4CAF50" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N18 [label="Team Management" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N19 [label="Stadium Operations" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Player Transfer" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Sports Betting Regulation" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+		nest0_1 [label=Coaching color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+		nest0_2 [label="Merchandise Sales" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+		nest0_0 -> nest0_1 [label=governs color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=scores color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Event Broadcasting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Sports Analytics" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+		nest1_1 [label="Venue Booking" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [label=maintains color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N14 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S0 -> N18 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N16 -> S1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N19 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=manages color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M2 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N7 -> M2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N18 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_91.txt b/test/graphviz/graph_hard/graphviz_91.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4348df37a89cd3a9cdc1d32d55be60c61eb373a8
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_91.txt
@@ -0,0 +1,39 @@
+<Anti_Doping Control, connectedTo, Refereeing>
+<Anti_Doping Control, connectedTo, Sports Betting Regulation>
+<Anti_Doping Control, connectedTo, Team Management>
+<Athlete Performance Tracking, connectedTo, Media Rights Negotiation>
+<Athlete Performance Tracking, connectedTo, Stadium Operations>
+<Athlete Performance Tracking, connectedTo, Team Management>
+<Coaching, partOf, Coaching>
+<Coaching, scores, Merchandise Sales>
+<Esports Event Management, connectedTo, Player Recruitment>
+<Esports Event Management, manages, Sports Psychology>
+<Fan Club Management, connectedTo, Rule Enforcement>
+<Fan Engagement, connectedTo, Sports Medicine>
+<Fitness Conditioning, connectedTo, Fan Engagement>
+<Fitness Conditioning, connectedTo, Team Management>
+<Game Strategy, connectedTo, Fitness Conditioning>
+<Injury Management, connectedTo, Sports Marketing>
+<Injury Management, connectedTo, Sports Psychology>
+<Media Rights Negotiation, connectedTo, Team Management>
+<Merchandise Sales, connectedTo, Fan Club Management>
+<Merchandise Sales, partOf, Merchandise Sales>
+<Player Recruitment, connectedTo, Youth Development Programs>
+<Refereeing, connectedTo, Game Strategy>
+<Rule Enforcement, connectedTo, Athlete Performance Tracking>
+<Scorekeeping, connectedTo, Injury Management>
+<Scorekeeping, connectedTo, Media Rights Negotiation>
+<Scorekeeping, connectedTo, Team Management>
+<Sports Analytics, connectedTo, Venue Booking>
+<Sports Analytics, partOf, Sports Analytics>
+<Sports Betting Regulation, governs, Coaching>
+<Sports Betting Regulation, partOf, Sports Betting Regulation>
+<Sports Marketing, connectedTo, Esports Event Management>
+<Sports Marketing, connectedTo, Sports Analytics>
+<Sports Medicine, connectedTo, Tournament Organization>
+<Sports Psychology, connectedTo, Anti_Doping Control>
+<Team Management, maintains, Stadium Operations>
+<Tournament Organization, connectedTo, Fan Club Management>
+<Venue Booking, connectedTo, Game Strategy>
+<Venue Booking, partOf, Venue Booking>
+<Youth Development Programs, connectedTo, Sports Psychology>
diff --git a/test/graphviz/graph_hard/graphviz_92.dot b/test/graphviz/graph_hard/graphviz_92.dot
new file mode 100644
index 0000000000000000000000000000000000000000..aae855dd1d0077bcdb1cc110dccc4bf862ec1f39
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_92.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Data Analytics in Sports" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N1 [label="Athlete Nutrition Planning" color="#6EB76D" fillcolor="#E9F7E8" shape=folder style=filled]
+	N2 [label="Fan Club Management" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N3 [label="Team Management" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N4 [label="Tournament Organization" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+	N5 [label="Media Rights Negotiation" color="#B0C5CD" fillcolor="#DFE7EB" shape=folder style=filled]
+	N6 [label="Sports Betting Regulation" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N7 [label="Rule Enforcement" color="#DCE775" fillcolor="#FCFCE7" shape=plaintext style=filled]
+	N8 [label="Game Strategy" color="#6EB76D" fillcolor="#E9F7E8" shape=plaintext style=filled]
+	N9 [label="Sponsorship Management" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N10 [label="Esports Event Management" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N11 [label=Scorekeeping color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N12 [label="Athlete Performance Tracking" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N13 [label="Accessibility in Sports Venues" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	S0 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Fitness Conditioning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Coaching color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+		nest0_1 [label="Venue Booking" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_2 [label="Stadium Operations" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Player Recruitment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="League Management" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+		nest1_1 [label="Athlete Brand Management" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+		nest1_2 [label="Player Transfer" color="#DCE775" fillcolor="#FCFCE7" shape=folder style=filled]
+		nest1_3 [label="Fan Engagement" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=tests color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=scores color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [label=streams color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [label=recruits color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label=optimizes color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> S2 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [label=sponsors color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N9 -> M2 [label=medicates color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	M2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_94.txt b/test/graphviz/graph_hard/graphviz_94.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1b2a82d7a0188ca26f6a1a92939557677c399631
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_94.txt
@@ -0,0 +1,38 @@
+<Brand Licensing, connectedTo, Sample Creation>
+<Brand Licensing, partOf, Brand Licensing>
+<Custom Apparel Design, connectedTo, Brand Building>
+<Custom Apparel Design, connectedTo, Return Processing>
+<Custom Apparel Design, recycles, Ready_to_Wear Collection Launch>
+<Fashion Show Production, partOf, Fashion Show Production>
+<Fashion Show Production, patterns, Global Sourcing Strategy>
+<Global Sourcing Strategy, connectedTo, Brand Building>
+<Global Sourcing Strategy, partOf, Global Sourcing Strategy>
+<Intellectual Property Protection, connectedTo, Brand Building>
+<Intellectual Property Protection, connectedTo, Ready_to_Wear Collection Launch>
+<Intellectual Property Protection, connectedTo, Styling>
+<PR and Media Outreach, connectedTo, Fashion Show Production>
+<PR and Media Outreach, partOf, PR and Media Outreach>
+<Packaging, connectedTo, Styling>
+<Quality Check, connectedTo, Textile Manufacturing>
+<Quality Check, develops, Retail Store Merchandising>
+<Ready_to_Wear Collection Launch, connectedTo, Brand Building>
+<Ready_to_Wear Collection Launch, connectedTo, Packaging>
+<Retail Store Merchandising, connectedTo, Custom Apparel Design>
+<Return Processing, connectedTo, Brand Building>
+<Return Processing, connectedTo, Intellectual Property Protection>
+<Return Processing, connectedTo, Packaging>
+<Return Processing, connectedTo, Ready_to_Wear Collection Launch>
+<Return Processing, connectedTo, Styling>
+<Sample Creation, connectedTo, Custom Apparel Design>
+<Sample Creation, partOf, Sample Creation>
+<Styling, connectedTo, Brand Building>
+<Styling, connectedTo, PR and Media Outreach>
+<Sustainable Fashion Practices, connectedTo, Custom Apparel Design>
+<Sustainable Fashion Practices, connectedTo, Quality Check>
+<Sustainable Fashion Practices, connectedTo, Ready_to_Wear Collection Launch>
+<Sustainable Fashion Practices, connectedTo, Return Processing>
+<Sustainable Fashion Practices, influences, Retail Store Merchandising>
+<Textile Manufacturing, connectedTo, Wholesale Distribution>
+<Textile Manufacturing, partOf, Textile Manufacturing>
+<Wholesale Distribution, connectedTo, Brand Licensing>
+<Wholesale Distribution, partOf, Wholesale Distribution>
diff --git a/test/graphviz/graph_hard/graphviz_95.dot b/test/graphviz/graph_hard/graphviz_95.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f81b00c2b5f07a173979e996969880f5b9c13537
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_95.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=RL
+	N0 [label="Textile Manufacturing" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Sustainable Fashion Practices" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N2 [label="Customer Feedback Analysis" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N3 [label="Quality Check" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N4 [label="Garment Fitting Session" color="#673AB7" fillcolor="#D1C4E9" shape=oval style=filled]
+	N5 [label="Trend Research" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N6 [label="Global Sourcing Strategy" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N7 [label="Wholesale Distribution" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N8 [label="Return Processing" color="#AF56A6" fillcolor="#DDCEDD" shape=oval style=filled]
+	N9 [label="Footwear Production" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N10 [label=Styling color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N11 [label="Embroidery and Embellishment" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N12 [label="Custom Apparel Design" color="#673AB7" fillcolor="#D1C4E9" shape=plaintext style=filled]
+	N13 [label="Brand Building" color="#673AB7" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N14 [label="E_commerce Management" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N15 [label="Garment Production" color="#9575CD" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N16 [label="Pattern Making" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Retail Store Merchandising" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Design Sketching" color="#9575CD" fillcolor="#EDE7F6" shape=folder style=filled]
+		nest0_1 [label="Haute Couture Creation" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Material Sourcing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Accessory Design" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest1_1 [label="Seasonal Collection Planning" color="#AF56A6" fillcolor="#DDCEDD" shape=folder style=filled]
+		nest1_2 [label="Customer Loyalty Programs" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+		nest1_3 [label="PR and Media Outreach" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=photographs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=collaborates color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=tests color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=sews color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [label=inspects color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [label=patterns color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=sources color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> M2 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	M2 -> N16 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/graph_hard/graphviz_95.txt b/test/graphviz/graph_hard/graphviz_95.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1028784fbeda4f9f351b1199ada543bb0922e2ad
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_95.txt
@@ -0,0 +1,45 @@
+<Accessory Design, connectedTo, Seasonal Collection Planning>
+<Accessory Design, partOf, Accessory Design>
+<Brand Building, connectedTo, E_commerce Management>
+<Custom Apparel Design, connectedTo, Brand Building>
+<Custom Apparel Design, connectedTo, Pattern Making>
+<Customer Feedback Analysis, connectedTo, Global Sourcing Strategy>
+<Customer Feedback Analysis, connectedTo, Pattern Making>
+<Customer Feedback Analysis, connectedTo, Quality Check>
+<Customer Loyalty Programs, partOf, Customer Loyalty Programs>
+<Customer Loyalty Programs, photographs, PR and Media Outreach>
+<Design Sketching, connectedTo, Haute Couture Creation>
+<Design Sketching, partOf, Design Sketching>
+<E_commerce Management, connectedTo, Garment Production>
+<Embroidery and Embellishment, connectedTo, Brand Building>
+<Embroidery and Embellishment, connectedTo, Custom Apparel Design>
+<Embroidery and Embellishment, connectedTo, E_commerce Management>
+<Embroidery and Embellishment, connectedTo, Garment Production>
+<Embroidery and Embellishment, connectedTo, Pattern Making>
+<Footwear Production, connectedTo, Styling>
+<Garment Fitting Session, collaborates, Trend Research>
+<Garment Fitting Session, connectedTo, Accessory Design>
+<Garment Fitting Session, connectedTo, Global Sourcing Strategy>
+<Garment Production, connectedTo, Pattern Making>
+<Global Sourcing Strategy, connectedTo, Footwear Production>
+<Global Sourcing Strategy, connectedTo, Wholesale Distribution>
+<Haute Couture Creation, connectedTo, Customer Feedback Analysis>
+<Haute Couture Creation, partOf, Haute Couture Creation>
+<PR and Media Outreach, connectedTo, Footwear Production>
+<PR and Media Outreach, partOf, PR and Media Outreach>
+<Quality Check, connectedTo, Footwear Production>
+<Quality Check, connectedTo, Garment Fitting Session>
+<Quality Check, connectedTo, Global Sourcing Strategy>
+<Quality Check, inspects, Brand Building>
+<Quality Check, sources, Footwear Production>
+<Return Processing, sews, Footwear Production>
+<Seasonal Collection Planning, connectedTo, Customer Loyalty Programs>
+<Seasonal Collection Planning, partOf, Seasonal Collection Planning>
+<Styling, connectedTo, Embroidery and Embellishment>
+<Sustainable Fashion Practices, connectedTo, Customer Feedback Analysis>
+<Sustainable Fashion Practices, connectedTo, Global Sourcing Strategy>
+<Textile Manufacturing, connectedTo, Sustainable Fashion Practices>
+<Trend Research, connectedTo, Design Sketching>
+<Trend Research, patterns, Footwear Production>
+<Trend Research, tests, Global Sourcing Strategy>
+<Wholesale Distribution, connectedTo, Return Processing>
diff --git a/test/graphviz/graph_hard/graphviz_96.dot b/test/graphviz/graph_hard/graphviz_96.dot
new file mode 100644
index 0000000000000000000000000000000000000000..59ccf4f1bc0957e4fc059a076e5ec5c5d7c391b2
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_96.dot
@@ -0,0 +1,63 @@
+digraph {
+	rankdir=TD
+	N0 [label="Textile Manufacturing" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Intellectual Property Protection" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N2 [label=Distribution color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+	N3 [label="Supply Chain Transparency" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N4 [label="Brand Licensing" color="#F7BEE0" fillcolor="#FAEBF3" shape=oval style=filled]
+	N5 [label="Global Sourcing Strategy" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N6 [label="Embroidery and Embellishment" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N7 [label="Haute Couture Creation" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+	N8 [label="Fabric Innovation" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N9 [label="Color Palette Selection" color="#03A9F4" fillcolor="#B3E5FC" shape=plaintext style=filled]
+	N10 [label=Packaging color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N11 [label="Quality Check" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="E_commerce Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Customer Loyalty Programs" color="#03A9F4" fillcolor="#B3E5FC" shape=folder style=filled]
+		nest0_1 [label="Influencer Collaboration" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_2 [label="Garment Fitting Session" color="#03A9F4" fillcolor="#B3E5FC" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Seasonal Collection Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Pattern Making" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_1 [label="Inventory Management" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_2 [label="Sample Creation" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest1_3 [label="Garment Production" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=trends color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=inspects color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=influences color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest1_0 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label=videos color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [label=stylizes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/graph_hard/graphviz_97.txt b/test/graphviz/graph_hard/graphviz_97.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aa58906e390b3109570ee2a2d9cf346d744b5dce
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_97.txt
@@ -0,0 +1,33 @@
+<Compensation and Benefits, connectedTo, Succession Planning>
+<Conflict Resolution, connectedTo, HR Policy Development>
+<Conflict Resolution, partOf, Conflict Resolution>
+<Employee Engagement Surveys, connectedTo, Compensation and Benefits>
+<Employee Training, connectedTo, Compensation and Benefits>
+<Employee Training, connectedTo, HR Information System Implementation>
+<Employee Training, connectedTo, Team Building Activities>
+<HR Analytics, connectedTo, Union Negotiations>
+<HR Analytics, partOf, HR Analytics>
+<HR Information System Implementation, connectedTo, Employee Engagement Surveys>
+<HR Information System Implementation, connectedTo, HR Policy Development>
+<HR Information System Implementation, connectedTo, Job Posting>
+<HR Information System Implementation, connectedTo, Succession Planning>
+<HR Policy Development, connectedTo, HR Analytics>
+<HR Policy Development, optimizes, Employee Engagement Surveys>
+<Health and Safety Management, connectedTo, Offer Management>
+<Offer Management, automates, HR Information System Implementation>
+<Offer Management, connectedTo, Compensation and Benefits>
+<Onboarding Process, connectedTo, Compensation and Benefits>
+<Onboarding Process, partOf, Onboarding Process>
+<Payroll Processing, connectedTo, Onboarding Process>
+<Payroll Processing, partOf, Payroll Processing>
+<Succession Planning, connectedTo, Job Posting>
+<Succession Planning, connectedTo, Payroll Processing>
+<Team Building Activities, connectedTo, Compensation and Benefits>
+<Team Building Activities, connectedTo, Employee Engagement Surveys>
+<Team Building Activities, connectedTo, HR Information System Implementation>
+<Team Building Activities, connectedTo, HR Policy Development>
+<Team Building Activities, connectedTo, Health and Safety Management>
+<Team Building Activities, connectedTo, Job Posting>
+<Team Building Activities, connectedTo, Succession Planning>
+<Union Negotiations, connectedTo, Conflict Resolution>
+<Union Negotiations, partOf, Union Negotiations>
diff --git a/test/graphviz/graph_hard/graphviz_98.txt b/test/graphviz/graph_hard/graphviz_98.txt
new file mode 100644
index 0000000000000000000000000000000000000000..786525b8607bb4dc5abfe51075fe014b6fccf6fb
--- /dev/null
+++ b/test/graphviz/graph_hard/graphviz_98.txt
@@ -0,0 +1,37 @@
+<Candidate Sourcing, connectedTo, Job Posting>
+<Compliance Management, connectedTo, HR Budgeting>
+<Disciplinary Procedures, partOf, Disciplinary Procedures>
+<Disciplinary Procedures, plans, Remote Work Policy>
+<Employee Data Management, connectedTo, Payroll Processing>
+<Employee Engagement Surveys, connectedTo, Employee Handbook Creation>
+<Employee Handbook Creation, complies, Candidate Sourcing>
+<Employee Handbook Creation, connectedTo, Job Posting>
+<Exit Interviews, connectedTo, Employee Data Management>
+<Global Mobility Programs, connectedTo, Exit Interviews>
+<Global Mobility Programs, connectedTo, Onboarding Process>
+<Global Mobility Programs, connectedTo, Team Building Activities>
+<Grievance Handling, connectedTo, Compliance Management>
+<HR Analytics, disciplines, Diversity and Inclusion Initiatives>
+<HR Budgeting, benefits, Global Mobility Programs>
+<Job Posting, connectedTo, Compliance Management>
+<Job Posting, connectedTo, Employee Data Management>
+<Job Posting, connectedTo, HR Analytics>
+<Job Posting, connectedTo, HR Budgeting>
+<Job Posting, connectedTo, Recruitment Planning>
+<Job Posting, connectedTo, Skill Development Programs>
+<Job Posting, secures, Recruitment Planning>
+<Job Posting, strategies, Compliance Management>
+<Leadership Training, connectedTo, Remote Work Policy>
+<Onboarding Process, connectedTo, Performance Appraisal>
+<Onboarding Process, partOf, Onboarding Process>
+<Payroll Processing, connectedTo, HR Analytics>
+<Performance Appraisal, connectedTo, Exit Interviews>
+<Performance Appraisal, partOf, Performance Appraisal>
+<Recruitment Planning, connectedTo, Grievance Handling>
+<Remote Work Policy, connectedTo, Employee Engagement Surveys>
+<Remote Work Policy, connectedTo, Job Posting>
+<Skill Development Programs, connectedTo, Recruitment Planning>
+<Succession Planning, connectedTo, Disciplinary Procedures>
+<Succession Planning, partOf, Succession Planning>
+<Team Building Activities, leads, Succession Planning>
+<Team Building Activities, partOf, Team Building Activities>
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+	N1 -> N2 [label=technologies_applies color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=models_populations color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=diseases_manages color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=analyzes_data color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=policies_influences color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N9 -> N8 [label=rehabilitates color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N10 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_106.dot b/test/graphviz/scanned_medium/graphviz_106.dot
new file mode 100644
index 0000000000000000000000000000000000000000..958aaf18a098da6fab78dc5f29142edcc8f5e09b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_106.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=TD
+	N0 [label="Buoy Deployment" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Sea Level Monitoring" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N2 [label="Hydrothermal Vent Exploration" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N3 [label="Biological Oceanography" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N4 [label="Coastal Zone Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N5 [label="Sediment Analysis" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N6 [label="Ocean Data Archiving" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N7 [label="Marine Hazards Assessment" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N8 [label="Marine Pollution Monitoring" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N9 [label="Marine Protected Area Planning" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N0 -> N1 [label=collects_data color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=predicts color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=operates_ROVs color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=understands color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=samples color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=waves color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N2 [label=surveys color="#E57373" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_108.txt b/test/graphviz/scanned_medium/graphviz_108.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2940ff949cfbb2befe861034663a1bc82eade6c1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_108.txt
@@ -0,0 +1,10 @@
+<Biomarker Discovery, connectedTo, Cloning Technologies>
+<Cloning Technologies, identifies, Functional Genomics>
+<Comparative Genomics, compares, Metabolomics>
+<Comparative Genomics, connectedTo, Cloning Technologies>
+<Functional Genomics, accesses_data, Genomic Data Visualization>
+<Genetic Testing, connectedTo, Gene Expression Profiling>
+<Genomic Data Visualization, connectedTo, Comparative Genomics>
+<Metabolomics, bioinformatics_uses, Genetic Testing>
+<Microbial Genomics, data_generates, Rare Disease Genomics>
+<Rare Disease Genomics, predicts, Biomarker Discovery>
diff --git a/test/graphviz/scanned_medium/graphviz_109.dot b/test/graphviz/scanned_medium/graphviz_109.dot
new file mode 100644
index 0000000000000000000000000000000000000000..19bb9048b2d5756b107a557e4d2924a63d813255
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_109.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=TD
+	N0 [label="Real_Time Captioning" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Speaker Diarization" color="#BCB88A" fillcolor="#F5F5DC" shape=Mdiamond style=filled]
+	N2 [label="Speaker Identification" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N3 [label="Legal Transcription" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N4 [label="Command and Control" color="#61CAC3" fillcolor="#C2E8E6" shape=octagon style=filled]
+	N5 [label="Language Modeling" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N6 [label="Dialect Adaptation" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N7 [label="Text_to_Speech Synthesis" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N0 -> N1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=develops color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=learns color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=translates color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N6 [label=commands color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_11.txt b/test/graphviz/scanned_medium/graphviz_11.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0e4c5ac55029d7e4ceb2d9c22be0cc9e3552ec9e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_11.txt
@@ -0,0 +1,12 @@
+<Barn Cleaning, licenses, Weather Tracking>
+<Crop Monitoring, develops, Farm Maintenance>
+<Disease Detection, irrigates, Water Level Measurement>
+<Farm Maintenance, propagates, Soil Testing>
+<Fencing Installation, automates, Grain Drying>
+<Fencing Installation, connectedTo, Crop Monitoring>
+<Food Processing, connectedTo, Greenhouse Control>
+<Greenhouse Control, connectedTo, Crop Monitoring>
+<Soil Testing, harvests, Greenhouse Control>
+<Soil Testing, researches, Barn Cleaning>
+<Water Level Measurement, connectedTo, Food Processing>
+<Weather Tracking, plants, Fencing Installation>
diff --git a/test/graphviz/scanned_medium/graphviz_110.dot b/test/graphviz/scanned_medium/graphviz_110.dot
new file mode 100644
index 0000000000000000000000000000000000000000..25b16a98a7d327667b6c4e8d86586ad127da6534
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_110.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=RL
+	N0 [label="Annotation Tools" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="Biomedical Text Mining" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N2 [label="Knowledge Graph Construction" color="#607D8B" fillcolor="#CFD8DC" shape=parallelogram style=filled]
+	N3 [label="Spam Detection" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N4 [label="Customer Feedback Analysis" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N5 [label="Text Classification" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+	N6 [label="Financial Text Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	N7 [label="Lemmatization or Stemming" color="#6EB76D" fillcolor="#E9F7E8" shape=folder style=filled]
+	N8 [label="Author Attribution" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N9 [label="Document Summarization" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N10 [label="Opinion Mining" color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N11 [label="Text Clustering" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N0 -> N1 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=structures color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=protects color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=applies color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=identifies color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=builds_tools color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=interprets color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=optimizes color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=entities color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_110.txt b/test/graphviz/scanned_medium/graphviz_110.txt
new file mode 100644
index 0000000000000000000000000000000000000000..052ec5b57c5d972810bcc2d6c9892d469f04bdb8
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_110.txt
@@ -0,0 +1,12 @@
+<Annotation Tools, connectedTo, Biomedical Text Mining>
+<Author Attribution, optimizes, Document Summarization>
+<Biomedical Text Mining, structures, Knowledge Graph Construction>
+<Customer Feedback Analysis, applies, Text Classification>
+<Document Summarization, entities, Opinion Mining>
+<Financial Text Analysis, builds_tools, Lemmatization or Stemming>
+<Knowledge Graph Construction, connectedTo, Spam Detection>
+<Lemmatization or Stemming, connectedTo, Document Summarization>
+<Lemmatization or Stemming, interprets, Author Attribution>
+<Opinion Mining, connectedTo, Text Clustering>
+<Spam Detection, protects, Customer Feedback Analysis>
+<Text Classification, identifies, Financial Text Analysis>
diff --git a/test/graphviz/scanned_medium/graphviz_112.txt b/test/graphviz/scanned_medium/graphviz_112.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8f1811bef79d19fabb712e9c8643fc8701bda828
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_112.txt
@@ -0,0 +1,10 @@
+<Automated Testing, connectedTo, Business Process Management>
+<Business Process Management, configures_rules, Customer Service Automation>
+<Customer Service Automation, streamlines, Finance Process Automation>
+<Decision Automation, connectedTo, Customer Service Automation>
+<Finance Process Automation, integrates_systems, Hyperautomation>
+<Hyperautomation, connectedTo, Low_Code or No_Code Automation>
+<Low_Code or No_Code Automation, connectedTo, Process Mapping>
+<Optical Character Recognition for Automation, BPM_utilizes, Decision Automation>
+<Optical Character Recognition for Automation, connectedTo, Hyperautomation>
+<Process Mapping, executes, Automated Testing>
diff --git a/test/graphviz/scanned_medium/graphviz_113.dot b/test/graphviz/scanned_medium/graphviz_113.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1706d8b7b90c1541811251d30bd5bdfd787940b6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_113.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=TD
+	N0 [label="Automated Optical Inspection" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Testing Methods" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N2 [label="Quality Standards Development" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N3 [label="Software Quality Assurance" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N4 [label="Component Inspection" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Inspection Procedures" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N6 [label="Total Quality Management" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+	N7 [label="Hardware Quality Testing" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N8 [label="Continuous Improvement" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N0 -> N1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=methodologies_applies color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=reports_generates color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=tests color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=equipment_calibrates color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N7 [label=defects_detects color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_114.dot b/test/graphviz/scanned_medium/graphviz_114.dot
new file mode 100644
index 0000000000000000000000000000000000000000..aa5e32dbf2280f9e9517dc60d2c64f7d4f2e0405
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_114.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=TD
+	N0 [label="Troubleshooting and Support" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label="ERP System Selection" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+	N2 [label="Data Governance" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N3 [label="Sales and Distribution" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N4 [label="Implementation Roadmap Development" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+	N5 [label="User Acceptance Testing" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N6 [label="Hybrid ERP Models" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N7 [label="Supply Chain Management" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N0 -> N1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=cloud_deploys color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=data_centralizes color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=manages color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=complies color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N4 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_114.txt b/test/graphviz/scanned_medium/graphviz_114.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2739473488a0c253bb800e0493f4edc49ca15fc3
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_114.txt
@@ -0,0 +1,8 @@
+<Data Governance, data_centralizes, Sales and Distribution>
+<ERP System Selection, cloud_deploys, Data Governance>
+<Hybrid ERP Models, connectedTo, Supply Chain Management>
+<Implementation Roadmap Development, manages, User Acceptance Testing>
+<Sales and Distribution, connectedTo, Implementation Roadmap Development>
+<Troubleshooting and Support, connectedTo, ERP System Selection>
+<User Acceptance Testing, complies, Hybrid ERP Models>
+<User Acceptance Testing, connectedTo, Implementation Roadmap Development>
diff --git a/test/graphviz/scanned_medium/graphviz_115.dot b/test/graphviz/scanned_medium/graphviz_115.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3aefb26927d9b791d58c4f6ff54ef9a85a782746
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_115.dot
@@ -0,0 +1,20 @@
+digraph {
+	rankdir=LR
+	N0 [label="AI for Crop Disease Detection" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N1 [label="Farm Labor Management Software" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N2 [label="Smart Livestock Monitoring" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N3 [label="Aquaculture Monitoring" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Forestry Management with Digital Tools" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N5 [label="Automated Farm Machinery" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N6 [label="Sensor Deployment" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N7 [label="Farm Robotics" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N0 -> N1 [label=manages color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=satellites_leverages color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=collects_data color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=analyzes_data color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=complies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N7 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N5 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_115.txt b/test/graphviz/scanned_medium/graphviz_115.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bca4256ca8f6d8615f6077c933e94a3bc3fa8c4d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_115.txt
@@ -0,0 +1,9 @@
+<AI for Crop Disease Detection, manages, Farm Labor Management Software>
+<Aquaculture Monitoring, connectedTo, Forestry Management with Digital Tools>
+<Automated Farm Machinery, complies, Sensor Deployment>
+<Automated Farm Machinery, connectedTo, Forestry Management with Digital Tools>
+<Farm Labor Management Software, satellites_leverages, Smart Livestock Monitoring>
+<Forestry Management with Digital Tools, analyzes_data, Automated Farm Machinery>
+<Sensor Deployment, connectedTo, Farm Robotics>
+<Smart Livestock Monitoring, collects_data, Aquaculture Monitoring>
+<Smart Livestock Monitoring, connectedTo, Farm Robotics>
diff --git a/test/graphviz/scanned_medium/graphviz_116.dot b/test/graphviz/scanned_medium/graphviz_116.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f5ac20d9f6177d3accf3d550b45f784723d06514
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_116.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=BT
+	N0 [label="Esports Education Programs" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Tournament Organization" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N2 [label="Nutrition for Esports Athletes" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+	N3 [label="Live Streaming Production" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N4 [label="Game Publisher Relations" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N5 [label="Event Broadcasting" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N6 [label="League Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N7 [label="Rules and Regulations Enforcement" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N8 [label="Merchandise Sales" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N0 -> N1 [label=plays color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=streams color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=advertises color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N8 [label=game_analyzes color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_117.dot b/test/graphviz/scanned_medium/graphviz_117.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b68e75c2a47a2a5a80f66845f1a9b26a0811f0ac
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_117.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=BT
+	N0 [label="Neurodegenerative Disease Research" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label=Connectomics color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+	N2 [label="Transcranial Magnetic Stimulation" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N3 [label="Behavioral Neuroscience" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="Neurological Disorder Diagnosis" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N5 [label="Cellular Neuroscience" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N6 [label="Molecular Neuroscience" color="#7E57C2" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N7 [label="Cognitive Neuroscience" color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+	N8 [label="Spike Train Analysis" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N9 [label="Consciousness Studies" color="#3F51B5" fillcolor="#C5CAE9" shape=octagon style=filled]
+	N10 [label="Computational Neuroscience" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N11 [label="Brain_Computer Interface" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N0 -> N1 [label=stimulates color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=behavior_links color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=trains color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=circuits_understands color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=simulates color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=applies color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N9 [label=drugs_tests color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_118.dot b/test/graphviz/scanned_medium/graphviz_118.dot
new file mode 100644
index 0000000000000000000000000000000000000000..56f5dbf559ecfdd439d0036fb7f534af372b073e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_118.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=TD
+	N0 [label="Digital Storytelling" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Dating Techniques" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N2 [label="Artifact Conservation" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N3 [label="Conservation Science" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N4 [label="3D Scanning of Artifacts" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N5 [label="Climate Change Impact on Heritage" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N6 [label="Oral History Collection" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N7 [label="Digital Documentation" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+	N8 [label="Community Engagement" color="#BDBDBD" fillcolor="#F5F5F5" shape=parallelogram style=filled]
+	N9 [label="Material Analysis" color="#BDBDBD" fillcolor="#F5F5F5" shape=octagon style=filled]
+	N10 [label="Site Preservation" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N0 -> N1 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=reports color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=analyzes_data color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=educates color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=engages color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=promotes color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N9 [label=laws_enforces color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_119.txt b/test/graphviz/scanned_medium/graphviz_119.txt
new file mode 100644
index 0000000000000000000000000000000000000000..555b5c99dd428579692d851bb3f9122d86c57367
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_119.txt
@@ -0,0 +1,8 @@
+<Biocontainment Strategies, connectedTo, Modular Biology Design>
+<Biofuel Production, designs, Computational Design of Biological Systems>
+<Biosensor Development, circuits_designs, Genetic Circuit Design>
+<Computational Design of Biological Systems, licenses, Biocontainment Strategies>
+<Microbial Factories, connectedTo, Biofuel Production>
+<Microbial Factories, connectedTo, Modular Biology Design>
+<Modular Biology Design, data_processes, Biosensor Development>
+<Regulatory Frameworks, complies, Microbial Factories>
diff --git a/test/graphviz/scanned_medium/graphviz_12.dot b/test/graphviz/scanned_medium/graphviz_12.dot
new file mode 100644
index 0000000000000000000000000000000000000000..76b45513a79107e03fc117986b51d07728ec9283
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_12.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=BT
+	N0 [label="Passport Renewal Assistance" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="Lost and Found Service" color="#A1887F" fillcolor="#EFEBE9" shape=diamond style=filled]
+	N2 [label="Event Reservation" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N3 [label="Adventure Sports Booking" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N4 [label="Travel Advisory Updates" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N5 [label="Museum Visit" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N6 [label="Cruise Ship Boarding" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+	N7 [label="Tour Guide Assignment" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N8 [label="Travel Blog Creation" color="#FFCC7A" fillcolor="#FFF6D9" shape=plaintext style=filled]
+	N9 [label="Restaurant Reservation" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N0 -> N1 [label=guides color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=visits color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=secures color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N2 [label=explores color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_120.dot b/test/graphviz/scanned_medium/graphviz_120.dot
new file mode 100644
index 0000000000000000000000000000000000000000..542065e6a93a2dc67cd307e817ad11bddaa7148b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_120.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=TD
+	N0 [label="Augmented Reality in Education" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N1 [label="Data Privacy in Education" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N2 [label="Collaborative Learning Platforms" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N3 [label="Virtual Classrooms" color="#4DB6AC" fillcolor="#E0F2F1" shape=folder style=filled]
+	N4 [label="Educational Robotics" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N5 [label="Learning Design Principles" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N6 [label="Massive Open Online Courses" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N7 [label="Remote Learning Solutions" color="#4DB6AC" fillcolor="#E0F2F1" shape=diamond style=filled]
+	N8 [label="E_Learning Platform Design" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=privacy_protects color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=markets color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=reports color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=simulates color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N8 [label=evaluates color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_120.txt b/test/graphviz/scanned_medium/graphviz_120.txt
new file mode 100644
index 0000000000000000000000000000000000000000..babfc9294bd800a9fac72e766b892dbf0e8beabb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_120.txt
@@ -0,0 +1,9 @@
+<Augmented Reality in Education, connectedTo, Data Privacy in Education>
+<Collaborative Learning Platforms, markets, Virtual Classrooms>
+<Data Privacy in Education, privacy_protects, Collaborative Learning Platforms>
+<Educational Robotics, reports, Learning Design Principles>
+<Learning Design Principles, simulates, Massive Open Online Courses>
+<Massive Open Online Courses, connectedTo, Remote Learning Solutions>
+<Massive Open Online Courses, evaluates, E_Learning Platform Design>
+<Remote Learning Solutions, connectedTo, E_Learning Platform Design>
+<Virtual Classrooms, connectedTo, Educational Robotics>
diff --git a/test/graphviz/scanned_medium/graphviz_121.dot b/test/graphviz/scanned_medium/graphviz_121.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a45acfc94e5b830d15cc10ca90d4a5876086a44d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_121.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=RL
+	N0 [label="Ocean_Atmosphere Interaction Study" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Lightning Detection" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N2 [label="Aviation Weather Briefing" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N3 [label="Agricultural Weather Advisory" color="#795548" fillcolor="#D7CCC8" shape=oval style=filled]
+	N4 [label="Climate Change Impact Study" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N5 [label="Upper Air Chart Analysis" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N6 [label="Air Quality Forecasting" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Fire Weather Forecasting" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Synoptic Chart Analysis" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_1 [label="Temperature Monitoring" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_2 [label="Public Weather Briefing" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest0_3 [label="Numerical Weather Prediction" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=measures color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=calculates color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=identifies color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=distributes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [label=supports color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [label=validates color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label=models color="#795548" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_122.txt b/test/graphviz/scanned_medium/graphviz_122.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a344cae0b6b7a7e35fc63c1a1617bdecea672576
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_122.txt
@@ -0,0 +1,25 @@
+<Arctic Weather Research, connectedTo, Marine Weather Forecast>
+<Arctic Weather Research, warns, Boundary Layer Study>
+<Atmospheric Data Collection, connectedTo, Satellite Meteorology>
+<Atmospheric Data Collection, partOf, Atmospheric Data Collection>
+<Atmospheric Sounding, connectedTo, Atmospheric Data Collection>
+<Atmospheric Sounding, partOf, Atmospheric Sounding>
+<Aviation Weather Briefing, charts, Humidity Sensing>
+<Aviation Weather Briefing, connectedTo, Humidity Sensing>
+<Aviation Weather Briefing, deploys, Climate Modeling>
+<Aviation Weather Briefing, detects, Snowfall Measurement>
+<Aviation Weather Briefing, supports, Tornado Watch or Warning>
+<Boundary Layer Study, predicts, Tornado Watch or Warning>
+<Climate Change Impact Study, connectedTo, Arctic Weather Research>
+<Climate Change Impact Study, connectedTo, Mesoscale Meteorology>
+<Climate Modeling, connectedTo, Atmospheric Sounding>
+<Climate Modeling, disseminates, Boundary Layer Study>
+<Humidity Sensing, connectedTo, Snowfall Measurement>
+<Marine Weather Forecast, connectedTo, Aviation Weather Briefing>
+<Marine Weather Forecast, connectedTo, Boundary Layer Study>
+<Mesoscale Meteorology, connectedTo, Arctic Weather Research>
+<Mesoscale Meteorology, connectedTo, Tropical Cyclone Analysis>
+<Satellite Meteorology, advises, Boundary Layer Study>
+<Satellite Meteorology, partOf, Satellite Meteorology>
+<Tornado Watch or Warning, connectedTo, Humidity Sensing>
+<Tropical Cyclone Analysis, connectedTo, Arctic Weather Research>
diff --git a/test/graphviz/scanned_medium/graphviz_123.dot b/test/graphviz/scanned_medium/graphviz_123.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d5b4ae46644ab216b3d7256c462414eb034e9219
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_123.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=RL
+	N0 [label="Drought Monitoring" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label="Seasonal Outlook Preparation" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N2 [label="Satellite Meteorology" color="#BCB88A" fillcolor="#F5F5DC" shape=Mdiamond style=filled]
+	N3 [label="Severe Weather Warning" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Fire Weather Forecasting" color="#7E57C2" fillcolor="#EDE7F6" shape=parallelogram style=filled]
+	N5 [label="Flood Prediction" color="#BCB88A" fillcolor="#F5F5DC" shape=folder style=filled]
+	N6 [label="Tornado Watch or Warning" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N7 [label="Numerical Weather Prediction" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N8 [label="Agricultural Weather Advisory" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N9 [label="Arctic Weather Research" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N10 [label="Temperature Monitoring" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Mesoscale Meteorology" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Climate Change Impact Study" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+		nest0_1 [label="Atmospheric Sounding" color="#BCB88A" fillcolor="#F5F5DC" shape=parallelogram style=filled]
+		nest0_2 [label="Marine Weather Forecast" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest0_3 [label="Climate Data Archiving" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=monitors color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=measures color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=studies color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [label=calibrates color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N3 [label=detects color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_124.dot b/test/graphviz/scanned_medium/graphviz_124.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1807927cd0cc94e1bcaab282df67d606f31487f0
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_124.dot
@@ -0,0 +1,34 @@
+digraph {
+	rankdir=BT
+	N0 [label="Biomedical Waste Handling" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Waste Management Policy Development" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N2 [label="Waste Characterization Study" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N3 [label="Hazardous Waste Disposal" color="#D3EB9F" fillcolor="#F8FDD3" shape=octagon style=filled]
+	N4 [label="Smart Waste Bins" color="#D3EB9F" fillcolor="#F8FDD3" shape=Mdiamond style=filled]
+	N5 [label=Composting color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N6 [label="Metal Recycling" color="#AED581" fillcolor="#F0F4C3" shape=octagon style=filled]
+	N7 [label="Material Recovery Facility Operation" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+	N8 [label="Waste Incineration" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Textile Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Landfill Operation" color="#C2B2F0" fillcolor="#EFE6FF" shape=diamond style=filled]
+		nest0_1 [label="Closed_Loop Systems" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=reclaims color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=optimizes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=collects color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [label=tracks color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_125.txt b/test/graphviz/scanned_medium/graphviz_125.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4e268eb8a185a9a21e9c03a83d8c063c2829fec0
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_125.txt
@@ -0,0 +1,23 @@
+<Biomedical Waste Handling, connectedTo, Plastic Recycling Technologies>
+<Biomedical Waste Handling, partOf, Biomedical Waste Handling>
+<Circular Economy Initiatives, connectedTo, Landfill Operation>
+<Circular Economy Initiatives, connectedTo, Plastic Recycling Technologies>
+<Closed_Loop Systems, connectedTo, Biomedical Waste Handling>
+<Closed_Loop Systems, partOf, Closed_Loop Systems>
+<Composting, connectedTo, Circular Economy Initiatives>
+<Container Management, connectedTo, Waste Logistics Optimization>
+<Container Management, plans, Waste Collection>
+<Electronic Waste Recycling, connectedTo, Textile Recycling>
+<Electronic Waste Recycling, recovers, Plastic Recycling Technologies>
+<Industrial Waste Management, controls, Transfer Station Management>
+<Landfill Operation, connectedTo, Smart Waste Bins>
+<Plastic Recycling Technologies, connectedTo, Transfer Station Management>
+<Plastic Recycling Technologies, connectedTo, Waste_to_Energy Conversion>
+<Plastic Recycling Technologies, manages, Industrial Waste Management>
+<Smart Waste Bins, connectedTo, Plastic Recycling Technologies>
+<Textile Recycling, connectedTo, Waste Compaction>
+<Transfer Station Management, treats, Waste_to_Energy Conversion>
+<Waste Collection, innovates, Closed_Loop Systems>
+<Waste Collection, partOf, Waste Collection>
+<Waste Compaction, connectedTo, Container Management>
+<Waste Logistics Optimization, connectedTo, Composting>
diff --git a/test/graphviz/scanned_medium/graphviz_126.txt b/test/graphviz/scanned_medium/graphviz_126.txt
new file mode 100644
index 0000000000000000000000000000000000000000..98dd2f4914f98348bd5a43e6482afbb955690e4e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_126.txt
@@ -0,0 +1,21 @@
+<Construction and Demolition Waste Management, connectedTo, Extended Producer Responsibility>
+<Construction and Demolition Waste Management, connectedTo, Plastic Recycling Technologies>
+<Electronic Waste Recycling, treats, Landfill Operation>
+<Extended Producer Responsibility, connectedTo, Smart Waste Bins>
+<Glass Recycling, connectedTo, Extended Producer Responsibility>
+<Industrial Waste Management, connectedTo, Plastic Recycling Technologies>
+<Industrial Waste Management, connectedTo, Public Education on Waste>
+<Landfill Operation, connectedTo, Industrial Waste Management>
+<Plastic Recycling Technologies, connectedTo, Glass Recycling>
+<Public Education on Waste, connectedTo, Resource Recovery>
+<Public Education on Waste, connectedTo, Waste Management Data Analytics>
+<Resource Recovery, connectedTo, Waste_to_Energy Conversion>
+<Resource Recovery, segregates, Construction and Demolition Waste Management>
+<Resource Recovery, tracks, Plastic Recycling Technologies>
+<Smart Waste Bins, connectedTo, Plastic Recycling Technologies>
+<Smart Waste Bins, monitors, Waste Sorting>
+<Waste Management Data Analytics, connectedTo, Waste_to_Energy Conversion>
+<Waste Management Data Analytics, partOf, Waste Management Data Analytics>
+<Waste Sorting, connectedTo, Transfer Station Management>
+<Waste_to_Energy Conversion, optimizes, Construction and Demolition Waste Management>
+<Waste_to_Energy Conversion, partOf, Waste_to_Energy Conversion>
diff --git a/test/graphviz/scanned_medium/graphviz_127.dot b/test/graphviz/scanned_medium/graphviz_127.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c8c61d2165914d52805f854123ab621e5c76b6ad
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_127.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=LR
+	N0 [label="Groundwater Management" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="Smart Water Networks" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N2 [label="Dam Management" color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+	N3 [label="Reservoir Operation" color="#73C6BC" fillcolor="#D0EFEE" shape=diamond style=filled]
+	N4 [label="Watershed Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N5 [label="Flood Control" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N6 [label="Water Resource Planning" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N7 [label="Water Treatment" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N8 [label="Agricultural Water Use Efficiency" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N9 [label="Drinking Water Standards Compliance" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Water Scarcity Mitigation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Climate Change Adaptation for Water" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+		nest0_1 [label="Environmental Flow Assessment" color="#61CAC3" fillcolor="#C2E8E6" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=monitors color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=filters color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [label=purifies color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_128.dot b/test/graphviz/scanned_medium/graphviz_128.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3c13e7e7bb4c763023f3fce655710a787f0ae66a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_128.dot
@@ -0,0 +1,49 @@
+digraph {
+	rankdir=BT
+	N0 [label="Water Rights Management" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N1 [label="Water Resource Planning" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N2 [label="Water Conservation Planning" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N3 [label="Wastewater Collection" color="#A188DB" fillcolor="#DED7F0" shape=oval style=filled]
+	N4 [label="Environmental Flow Assessment" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+	N5 [label="Piping Network Repair" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N6 [label="Irrigation Management" color="#AB47BC" fillcolor="#F3E5F5" shape=plaintext style=filled]
+	N7 [label="Water Meter Reading" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N8 [label="Stormwater Management" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N9 [label="Flood Control" color="#90A4AE" fillcolor="#ECEFF1" shape=oval style=filled]
+	N10 [label="Pollution Source Identification" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N11 [label="Billing and Revenue Management" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N12 [label="Water Scarcity Mitigation" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Water Distribution" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Water Treatment" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+		nest0_1 [label="Water Loss Detection" color="#AB47BC" fillcolor="#F3E5F5" shape=plaintext style=filled]
+		nest0_2 [label="Drought Management" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=filters color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=permits color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=treats color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=irrigates color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=monitors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=consults color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N11 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=drains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [label=recycles color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N12 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_129.dot b/test/graphviz/scanned_medium/graphviz_129.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4f46deaab77d6a6a97fd8ba7a0b4c72e298d7534
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_129.dot
@@ -0,0 +1,46 @@
+digraph {
+	rankdir=RL
+	N0 [label="Water Distribution" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Groundwater Management" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N2 [label="Pollution Source Identification" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N3 [label="Water Infrastructure Maintenance" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+	N4 [label="Greywater Recycling" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N5 [label="Hydrological Modeling" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N6 [label="Aquifer Recharge" color="#FFD54F" fillcolor="#FFF8E1" shape=Mdiamond style=filled]
+	N7 [label="Ecosystem Protection" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N8 [label="Sewer System Inspection" color="#FFE69C" fillcolor="#FFF9D4" shape=hexagon style=filled]
+	N9 [label="Industrial Water Use Optimization" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N10 [label="Drinking Water Standards Compliance" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N11 [label="Flood Control" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+	N12 [label="Climate Change Adaptation for Water" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Wastewater Collection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Water Treatment" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_1 [label="Environmental Flow Assessment" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=controls color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=consults color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=secures color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=audits color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [label=manages color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N6 -> S0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [label=drains color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=optimizes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_13.dot b/test/graphviz/scanned_medium/graphviz_13.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6b1724a8fc72e1fe541b5b99743f800f99125c81
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_13.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=LR
+	N0 [label="Ownership Transfer" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N1 [label="Title Check" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N2 [label="Closing Meeting" color="#B0C5CD" fillcolor="#DFE7EB" shape=Mdiamond style=filled]
+	N3 [label="Maintenance Request" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+	N4 [label="Property Valuation" color="#B0C5CD" fillcolor="#DFE7EB" shape=oval style=filled]
+	N5 [label="Escrow Setup" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N6 [label="Home Inspection" color="#C0CA33" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N7 [label="Brokerage License Renewal" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N0 -> N1 [label=evaluates color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=renovates color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=develops color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=zones color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N0 [label=finalizes color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_13.txt b/test/graphviz/scanned_medium/graphviz_13.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3c6b3ab1d9a17c1602f3fef53535a2a2104dc6ac
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_13.txt
@@ -0,0 +1,8 @@
+<Closing Meeting, develops, Maintenance Request>
+<Escrow Setup, connectedTo, Home Inspection>
+<Escrow Setup, finalizes, Ownership Transfer>
+<Home Inspection, connectedTo, Brokerage License Renewal>
+<Maintenance Request, zones, Property Valuation>
+<Ownership Transfer, evaluates, Title Check>
+<Property Valuation, connectedTo, Escrow Setup>
+<Title Check, renovates, Closing Meeting>
diff --git a/test/graphviz/scanned_medium/graphviz_131.txt b/test/graphviz/scanned_medium/graphviz_131.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b757415f2916316f11dafc104e5c9afb4c70e991
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_131.txt
@@ -0,0 +1,22 @@
+<Advanced Sorting Technologies, connectedTo, Cleaning and Processing>
+<Chemical Recycling, connectedTo, Waste Stream Analysis>
+<Chemical Recycling, partOf, Chemical Recycling>
+<Cleaning and Processing, assesses, Metal Recycling>
+<Cleaning and Processing, connectedTo, Electronic Waste Recycling>
+<Cleaning and Processing, tests, Mechanical Recycling>
+<Closed_Loop Material Flow, connectedTo, Waste Stream Analysis>
+<Closed_Loop Material Flow, segregates, Product Design for Recyclability>
+<Composting Organic Waste, connectedTo, Chemical Recycling>
+<Composting Organic Waste, partOf, Composting Organic Waste>
+<Electronic Waste Recycling, recovers, Recycling Data Tracking>
+<Mechanical Recycling, connectedTo, Product Design for Recyclability>
+<Metal Recycling, connectedTo, End_of_Life Product Management>
+<Product Design for Recyclability, collects, Public Recycling Programs>
+<Product Design for Recyclability, connectedTo, Metal Recycling>
+<Public Recycling Programs, manufactures, Composting Organic Waste>
+<Public Recycling Programs, partOf, Public Recycling Programs>
+<Recycling Data Tracking, connectedTo, Closed_Loop Material Flow>
+<Recycling Data Tracking, connectedTo, End_of_Life Product Management>
+<Recycling Data Tracking, connectedTo, Product Design for Recyclability>
+<Recycling Data Tracking, transports, Metal Recycling>
+<Waste Stream Analysis, connectedTo, Mechanical Recycling>
diff --git a/test/graphviz/scanned_medium/graphviz_132.dot b/test/graphviz/scanned_medium/graphviz_132.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ae3243f6bf4f2ca4aeced80ea74104dbec604438
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_132.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=BT
+	N0 [label="Recycling Policy Advocacy" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Product Design for Recyclability" color="#FFB74D" fillcolor="#FFF3E0" shape=plaintext style=filled]
+	N2 [label="Metal Recycling" color="#FFB74D" fillcolor="#FFF3E0" shape=plaintext style=filled]
+	N3 [label="Waste Stream Analysis" color="#FFB74D" fillcolor="#FFF3E0" shape=parallelogram style=filled]
+	N4 [label="Circular Economy Implementation" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+	N5 [label="Collection Point Management" color="#FFB74D" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+	N6 [label="Waste Audit for Recycling" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	S1 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Material Collection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Glass Recycling" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+		nest0_1 [label="Construction Waste Recycling" color="#FFB74D" fillcolor="#FFF3E0" shape=plaintext style=filled]
+		nest0_2 [label="Composting Organic Waste" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+		nest0_3 [label="Plastic Recycling" color="#90A4AE" fillcolor="#ECEFF1" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label=supports color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=partners color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label=bundles color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	S1 -> N2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_134.dot b/test/graphviz/scanned_medium/graphviz_134.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4ab9aad16f5981d8deafab6671e859337a259ef2
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_134.dot
@@ -0,0 +1,55 @@
+digraph {
+	rankdir=TD
+	N0 [label="Ecological Restoration" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Sustainable Forest Management" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N2 [label=Afforestation color="#81C784" fillcolor="#F1F8E9" shape=oval style=filled]
+	N3 [label="Forest Road Construction" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N4 [label="Forest Research" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N5 [label="Forest Land Use Planning" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Forest Inventory" color="#81C784" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N7 [label="Pest and Disease Control" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N8 [label="Sawmill Processing" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N9 [label="Non_Timber Forest Product Collection" color="#81C784" fillcolor="#F1F8E9" shape=folder style=filled]
+	N10 [label="Tree Planting" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+	N11 [label="Biomass Production from Forests" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	S0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Forest Health Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Recreation Management" color="#81C784" fillcolor="#F1F8E9" shape=plaintext style=filled]
+		nest0_1 [label="Wood Product Manufacturing" color="#66BB6A" fillcolor="#E8F5E9" shape=oval style=filled]
+		nest0_2 [label="Urban Forestry Management" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=certifies color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=audits color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=processes color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=monitors color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=thins color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=plants color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label=conserves color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [label=reports color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_134.txt b/test/graphviz/scanned_medium/graphviz_134.txt
new file mode 100644
index 0000000000000000000000000000000000000000..618daceda45ce825185c2ce7b52718feb8c54e06
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_134.txt
@@ -0,0 +1,27 @@
+<Afforestation, connectedTo, Forest Road Construction>
+<Afforestation, connectedTo, Pest and Disease Control>
+<Afforestation, connectedTo, Sawmill Processing>
+<Afforestation, connectedTo, Tree Planting>
+<Ecological Restoration, connectedTo, Forest Road Construction>
+<Ecological Restoration, connectedTo, Sustainable Forest Management>
+<Forest Inventory, connectedTo, Non_Timber Forest Product Collection>
+<Forest Inventory, connectedTo, Pest and Disease Control>
+<Forest Inventory, conserves, Tree Planting>
+<Forest Land Use Planning, processes, Forest Inventory>
+<Forest Research, audits, Forest Land Use Planning>
+<Forest Road Construction, connectedTo, Forest Research>
+<Non_Timber Forest Product Collection, thins, Tree Planting>
+<Pest and Disease Control, connectedTo, Recreation Management>
+<Pest and Disease Control, connectedTo, Sawmill Processing>
+<Pest and Disease Control, reports, Tree Planting>
+<Recreation Management, connectedTo, Wood Product Manufacturing>
+<Recreation Management, partOf, Recreation Management>
+<Sawmill Processing, monitors, Non_Timber Forest Product Collection>
+<Sustainable Forest Management, certifies, Afforestation>
+<Sustainable Forest Management, connectedTo, Forest Road Construction>
+<Sustainable Forest Management, connectedTo, Tree Planting>
+<Tree Planting, plants, Biomass Production from Forests>
+<Urban Forestry Management, connectedTo, Forest Road Construction>
+<Urban Forestry Management, partOf, Urban Forestry Management>
+<Wood Product Manufacturing, connectedTo, Urban Forestry Management>
+<Wood Product Manufacturing, partOf, Wood Product Manufacturing>
diff --git a/test/graphviz/scanned_medium/graphviz_135.dot b/test/graphviz/scanned_medium/graphviz_135.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cc425fbc8094340926a4a4b1e73682ed1bd053f8
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_135.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=TD
+	N0 [label="Drone Surveying for Forests" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Sustainable Forest Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N2 [label="Forest Road Construction" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N3 [label="Forest Health Monitoring" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N4 [label="Climate Change Adaptation in Forests" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N5 [label="Forestry Education" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+	N6 [label="Tree Nursery Management" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	S0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Ecological Restoration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Public Access Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+		nest0_1 [label="Forest Fire Management" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=maps color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=conserves color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [label=controls color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [label=treats color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_135.txt b/test/graphviz/scanned_medium/graphviz_135.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a6f6892c07649f8aac77e8730afd4e230e29d0fc
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_135.txt
@@ -0,0 +1,17 @@
+<Climate Change Adaptation in Forests, connectedTo, Forestry Education>
+<Drone Surveying for Forests, connectedTo, Forest Health Monitoring>
+<Drone Surveying for Forests, connectedTo, Tree Nursery Management>
+<Drone Surveying for Forests, conserves, Sustainable Forest Management>
+<Drone Surveying for Forests, treats, Forestry Education>
+<Forest Fire Management, controls, Tree Nursery Management>
+<Forest Fire Management, partOf, Forest Fire Management>
+<Forest Health Monitoring, connectedTo, Climate Change Adaptation in Forests>
+<Forest Health Monitoring, connectedTo, Forestry Education>
+<Forest Health Monitoring, connectedTo, Tree Nursery Management>
+<Forest Road Construction, connectedTo, Forest Health Monitoring>
+<Forest Road Construction, connectedTo, Public Access Management>
+<Forestry Education, connectedTo, Tree Nursery Management>
+<Public Access Management, maps, Forest Fire Management>
+<Public Access Management, partOf, Public Access Management>
+<Sustainable Forest Management, connectedTo, Forest Health Monitoring>
+<Sustainable Forest Management, connectedTo, Forest Road Construction>
diff --git a/test/graphviz/scanned_medium/graphviz_136.dot b/test/graphviz/scanned_medium/graphviz_136.dot
new file mode 100644
index 0000000000000000000000000000000000000000..184307f4c591f67e8b976755a3ad56a4ec53315c
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_136.dot
@@ -0,0 +1,36 @@
+digraph {
+	rankdir=RL
+	N0 [label="Pre_surgical Assessment" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label=Diagnosis color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N2 [label="Medical Treatment" color="#80DDEA" fillcolor="#D3F7F9" shape=oval style=filled]
+	N3 [label="Nutritional Counseling" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N4 [label="Toxicology Testing" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N5 [label="Parasite Control" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N6 [label=Microchipping color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Behavioral Counseling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Medical Record Keeping" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest0_1 [label="Equine Care" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+		nest0_2 [label=Prescription color="#80DDEA" fillcolor="#D3F7F9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=operates color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=communicates color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N2 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=orders color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [label=dresses color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_138.txt b/test/graphviz/scanned_medium/graphviz_138.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d45feca740319c343b547ffb81d2743cd4670985
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_138.txt
@@ -0,0 +1,22 @@
+<Allergy Testing, vaccinates, Nutritional Counseling>
+<Diagnosis, partOf, Diagnosis>
+<Diagnosis, records, Pet Check_up>
+<Farm Animal Health Management, anesthetizes, Nutritional Counseling>
+<Farm Animal Health Management, euthanizes, Medical Treatment>
+<Farm Animal Health Management, rehabilitates, Wildlife Rehabilitation>
+<Hospice Care for Animals, connectedTo, Microchipping>
+<Livestock Disease Prevention, connectedTo, Hospice Care for Animals>
+<Microchipping, connectedTo, Veterinary Technology Training>
+<Nutritional Counseling, connectedTo, Diagnosis>
+<Nutritional Counseling, connectedTo, Medical Treatment>
+<Pain Management, connectedTo, Farm Animal Health Management>
+<Pet Check_up, connectedTo, Pain Management>
+<Pet Check_up, partOf, Pet Check_up>
+<Pharmacy Management, connectedTo, Hospice Care for Animals>
+<Pharmacy Management, connectedTo, Pre_surgical Assessment>
+<Pharmacy Management, regulates, Veterinary Technology Training>
+<Pre_surgical Assessment, connectedTo, Hospice Care for Animals>
+<Pre_surgical Assessment, connectedTo, Livestock Disease Prevention>
+<Pre_surgical Assessment, consults, Veterinary Technology Training>
+<Veterinary Technology Training, connectedTo, Pain Management>
+<Wildlife Rehabilitation, connectedTo, Allergy Testing>
diff --git a/test/graphviz/scanned_medium/graphviz_139.dot b/test/graphviz/scanned_medium/graphviz_139.dot
new file mode 100644
index 0000000000000000000000000000000000000000..afd62882e3efaa89611a9d565ce3b3650ca5b2ee
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_139.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=TD
+	N0 [label="Child Development Assessment" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Outdoor Exploration" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N2 [label="Nutritional Meal Preparation" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N3 [label="Learning Material Selection" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+	N4 [label="Early Literacy Programs" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N5 [label="Behavior Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N6 [label="Individualized Attention" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+	N7 [label="Creative Arts Activities" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N8 [label="Toddler Activities" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N9 [label="Preschool Education" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N10 [label="Emotional Support" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N11 [label="Enrollment and Admissions" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N12 [label="Parent_Teacher Conferences" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	S0 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Hygiene Practices" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Motor Skill Development" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+		nest0_1 [label="Parent Communication" color="#FFEB3B" fillcolor="#FFF9C4" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=maintains color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=accommodates color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=complies color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [label=teaches color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_14.dot b/test/graphviz/scanned_medium/graphviz_14.dot
new file mode 100644
index 0000000000000000000000000000000000000000..67865f915b202fe8e23815eb8a9574ecac2b1756
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_14.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=TD
+	N0 [label="Inmate Transport" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N1 [label="Law Enforcement Database Check" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N2 [label="Emergency Medical Service" color="#64B5F6" fillcolor="#E3F2FD" shape=folder style=filled]
+	N3 [label="Traffic Control" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N4 [label="Surveillance Review" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N5 [label="Suspect Identification" color="#64B5F6" fillcolor="#E3F2FD" shape=oval style=filled]
+	N6 [label="Shelter Setup" color="#FFCC80" fillcolor="#FFF0CC" shape=Mdiamond style=filled]
+	N7 [label="Post_Incident Review" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N8 [label="Responder Alert" color="#64B5F6" fillcolor="#E3F2FD" shape=plaintext style=filled]
+	N9 [label="Incident Reporting" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N0 -> N1 [label=detains color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=debriefs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=monitors color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=assesses color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N0 -> N7 [label=warns color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N8 [label=arrests color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_14.txt b/test/graphviz/scanned_medium/graphviz_14.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3c06c4d6fc8e929eb41858f00bfd11186534e0ec
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_14.txt
@@ -0,0 +1,11 @@
+<Emergency Medical Service, arrests, Responder Alert>
+<Emergency Medical Service, debriefs, Traffic Control>
+<Inmate Transport, detains, Law Enforcement Database Check>
+<Inmate Transport, warns, Post_Incident Review>
+<Law Enforcement Database Check, connectedTo, Emergency Medical Service>
+<Post_Incident Review, connectedTo, Responder Alert>
+<Responder Alert, connectedTo, Incident Reporting>
+<Shelter Setup, connectedTo, Post_Incident Review>
+<Surveillance Review, assesses, Suspect Identification>
+<Suspect Identification, connectedTo, Shelter Setup>
+<Traffic Control, monitors, Surveillance Review>
diff --git a/test/graphviz/scanned_medium/graphviz_140.dot b/test/graphviz/scanned_medium/graphviz_140.dot
new file mode 100644
index 0000000000000000000000000000000000000000..92a6b2ea61256f1e039cd5bc4dcd4e102c5766c9
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_140.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=BT
+	N0 [label="After_School Programs" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N1 [label="Enrollment and Admissions" color="#03A9F4" fillcolor="#B3E5FC" shape=plaintext style=filled]
+	N2 [label="Parent Communication" color="#FBC02D" fillcolor="#FFFDE7" shape=folder style=filled]
+	N3 [label="Preschool Education" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N4 [label="Outdoor Play Supervision" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Emotional Support" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N6 [label="Nap Time Supervision" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N7 [label="Special Needs Accommodation" color="#FBC02D" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N8 [label="Creative Arts Activities" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#FBC02D" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Nutritional Meal Preparation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Safety Supervision" color="#03A9F4" fillcolor="#B3E5FC" shape=plaintext style=filled]
+		nest0_1 [label="Child Protection Policies" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=manages color="#81C784" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=develops color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=administers color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [label="cares for" color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N5 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [label=creates color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [label=educates color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_141.dot b/test/graphviz/scanned_medium/graphviz_141.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bd2cd523ce9874349e1ac5951c0821d66f18ee3e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_141.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=TD
+	N0 [label="Emergency Evacuation Drills" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N1 [label="Child Protection Policies" color="#82DAFF" fillcolor="#C8EDFF" shape=oval style=filled]
+	N2 [label="Emotional Support" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N3 [label="Child Psychology Application" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N4 [label="Staff Training and Certification" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+	N5 [label="Enrollment and Admissions" color="#FFCC7A" fillcolor="#FFF6D9" shape=hexagon style=filled]
+	N6 [label="Group Activities Coordination" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	S1 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Playground Safety Inspection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Daily Activity Reporting" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+		nest0_1 [label="Nutritional Meal Preparation" color="#66BB6A" fillcolor="#E8F5E9" shape=folder style=filled]
+		nest0_2 [label="Early Literacy Programs" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=plans color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [label=teaches color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N4 [label=cleans color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label=creates color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_141.txt b/test/graphviz/scanned_medium/graphviz_141.txt
new file mode 100644
index 0000000000000000000000000000000000000000..587855e923a7465f212438b6005f5955dbc3d769
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_141.txt
@@ -0,0 +1,20 @@
+<Child Protection Policies, connectedTo, Emotional Support>
+<Child Protection Policies, connectedTo, Enrollment and Admissions>
+<Child Protection Policies, creates, Child Psychology Application>
+<Child Psychology Application, connectedTo, Daily Activity Reporting>
+<Child Psychology Application, connectedTo, Staff Training and Certification>
+<Daily Activity Reporting, partOf, Daily Activity Reporting>
+<Daily Activity Reporting, plans, Nutritional Meal Preparation>
+<Early Literacy Programs, connectedTo, Group Activities Coordination>
+<Early Literacy Programs, partOf, Early Literacy Programs>
+<Emergency Evacuation Drills, connectedTo, Child Protection Policies>
+<Emergency Evacuation Drills, connectedTo, Child Psychology Application>
+<Emergency Evacuation Drills, connectedTo, Enrollment and Admissions>
+<Emotional Support, cleans, Staff Training and Certification>
+<Emotional Support, connectedTo, Child Psychology Application>
+<Emotional Support, connectedTo, Group Activities Coordination>
+<Emotional Support, teaches, Enrollment and Admissions>
+<Enrollment and Admissions, connectedTo, Group Activities Coordination>
+<Nutritional Meal Preparation, connectedTo, Early Literacy Programs>
+<Nutritional Meal Preparation, partOf, Nutritional Meal Preparation>
+<Staff Training and Certification, connectedTo, Enrollment and Admissions>
diff --git a/test/graphviz/scanned_medium/graphviz_142.dot b/test/graphviz/scanned_medium/graphviz_142.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6ab64f2b3abf52de5db298ef73dfba7c6c9b33d1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_142.dot
@@ -0,0 +1,38 @@
+digraph {
+	rankdir=LR
+	N0 [label="Chronic Disease Management" color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	N1 [label="Emergency Response System Monitoring" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N2 [label="Dementia Care" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N3 [label="Respite Care" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N4 [label="Elder Abuse Prevention" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N5 [label="Caregiver Training" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+	N6 [label="Care Plan Development" color="#B0C5CD" fillcolor="#DFE7EB" shape=folder style=filled]
+	N7 [label="Emotional Support and Counseling" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+	N8 [label="Hospice Care Coordination" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	M0 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Pain Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Safety Assessments" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+		nest0_1 [label="Nutritional Assessment" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest0_2 [label="Health Monitoring" color="#FFD54F" fillcolor="#FFF8E1" shape=octagon style=filled]
+		nest0_3 [label=Companionship color="#B0C5CD" fillcolor="#DFE7EB" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=facilitates color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=oversees color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=therapies color="#795548" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=reports color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N8 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_142.txt b/test/graphviz/scanned_medium/graphviz_142.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d368ff17766f8d434ae2ddf0b3a6da9ccfdafd93
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_142.txt
@@ -0,0 +1,20 @@
+<Care Plan Development, connectedTo, Emotional Support and Counseling>
+<Caregiver Training, reports, Care Plan Development>
+<Chronic Disease Management, connectedTo, Emergency Response System Monitoring>
+<Chronic Disease Management, connectedTo, Respite Care>
+<Companionship, connectedTo, Hospice Care Coordination>
+<Companionship, partOf, Companionship>
+<Dementia Care, facilitates, Respite Care>
+<Elder Abuse Prevention, therapies, Caregiver Training>
+<Emergency Response System Monitoring, connectedTo, Dementia Care>
+<Emergency Response System Monitoring, connectedTo, Respite Care>
+<Emotional Support and Counseling, connectedTo, Hospice Care Coordination>
+<Emotional Support and Counseling, connectedTo, Safety Assessments>
+<Health Monitoring, connectedTo, Companionship>
+<Health Monitoring, partOf, Health Monitoring>
+<Nutritional Assessment, connectedTo, Health Monitoring>
+<Nutritional Assessment, connectedTo, Safety Assessments>
+<Nutritional Assessment, partOf, Nutritional Assessment>
+<Respite Care, oversees, Elder Abuse Prevention>
+<Safety Assessments, connectedTo, Nutritional Assessment>
+<Safety Assessments, partOf, Safety Assessments>
diff --git a/test/graphviz/scanned_medium/graphviz_144.dot b/test/graphviz/scanned_medium/graphviz_144.dot
new file mode 100644
index 0000000000000000000000000000000000000000..de043a84c0333e9e94291df678b33603665103c1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_144.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=BT
+	N0 [label="Personal Care Assistance" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	N1 [label="Memory Care" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+	N2 [label="Daily Living Assistance" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N3 [label="Physical Therapy" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N4 [label="Emergency Response System Monitoring" color="#D3EB9F" fillcolor="#F8FDD3" shape=Mdiamond style=filled]
+	N5 [label="Community Resource Connection" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Care Plan Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Chronic Disease Management" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_1 [label="Telehealth for Seniors" color="#D3EB9F" fillcolor="#F8FDD3" shape=folder style=filled]
+		nest0_2 [label="Long_Term Care Planning" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+		nest0_3 [label="Mobility Support" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=recommends color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=coordinates color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=personalizes color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=bathes color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label=documents color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label=counsels color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_145.dot b/test/graphviz/scanned_medium/graphviz_145.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a8c46dd12ef52c2faa6ed8cddf198f008ac50c74
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_145.dot
@@ -0,0 +1,51 @@
+digraph {
+	rankdir=BT
+	N0 [label="Shelter Management" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label="Policy and Legislation Review" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N2 [label="Infrastructure Repair" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N3 [label="Cash Transfer Programs" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N4 [label="Climate Change Adaptation for Disasters" color="#FF5722" fillcolor="#FFCCBC" shape=parallelogram style=filled]
+	N5 [label="Risk Assessment" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N6 [label="Geographic Information Systems for Disasters" color="#FF5722" fillcolor="#FFCCBC" shape=oval style=filled]
+	N7 [label="Logistics and Supply Chain" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N8 [label="Emergency Response" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N9 [label="International Aid Coordination" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N10 [label="Recovery Planning" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N11 [label="Volunteer Coordination" color="#94C0C0" fillcolor="#CADEDE" shape=box style=filled]
+	N12 [label="Post_Disaster Evaluation" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N13 [label="Public Awareness Campaigns" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Damage Assessment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Emergency Drills and Exercises" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+		nest0_1 [label="Psychosocial Support" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+		nest0_2 [label="Resource Mobilization" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+		nest0_3 [label="Early Recovery Actions" color="#7986CB" fillcolor="#E8EAF6" shape=oval style=filled]
+		nest0_0 -> nest0_1 [label=shelters color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=provides color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=analyzes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=identifies color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=assesses color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=supports color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [label=locates color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N8 [label=prevents color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=secures color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_145.txt b/test/graphviz/scanned_medium/graphviz_145.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6e89c2aefcd6e7b3def3c32512c62b7a9bdf9a39
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_145.txt
@@ -0,0 +1,26 @@
+<Cash Transfer Programs, connectedTo, Climate Change Adaptation for Disasters>
+<Climate Change Adaptation for Disasters, connectedTo, Risk Assessment>
+<Early Recovery Actions, partOf, Early Recovery Actions>
+<Early Recovery Actions, prevents, Emergency Response>
+<Emergency Drills and Exercises, partOf, Emergency Drills and Exercises>
+<Emergency Drills and Exercises, shelters, Psychosocial Support>
+<Emergency Response, identifies, International Aid Coordination>
+<Geographic Information Systems for Disasters, connectedTo, Logistics and Supply Chain>
+<Infrastructure Repair, connectedTo, Cash Transfer Programs>
+<Infrastructure Repair, connectedTo, Volunteer Coordination>
+<International Aid Coordination, assesses, Recovery Planning>
+<Logistics and Supply Chain, connectedTo, Emergency Response>
+<Policy and Legislation Review, provides, Infrastructure Repair>
+<Post_Disaster Evaluation, connectedTo, Emergency Drills and Exercises>
+<Post_Disaster Evaluation, locates, Public Awareness Campaigns>
+<Psychosocial Support, connectedTo, Resource Mobilization>
+<Psychosocial Support, partOf, Psychosocial Support>
+<Recovery Planning, connectedTo, Post_Disaster Evaluation>
+<Recovery Planning, connectedTo, Public Awareness Campaigns>
+<Recovery Planning, connectedTo, Volunteer Coordination>
+<Resource Mobilization, connectedTo, Early Recovery Actions>
+<Resource Mobilization, partOf, Resource Mobilization>
+<Risk Assessment, analyzes, Geographic Information Systems for Disasters>
+<Shelter Management, connectedTo, Policy and Legislation Review>
+<Shelter Management, secures, Volunteer Coordination>
+<Volunteer Coordination, supports, Post_Disaster Evaluation>
diff --git a/test/graphviz/scanned_medium/graphviz_147.dot b/test/graphviz/scanned_medium/graphviz_147.dot
new file mode 100644
index 0000000000000000000000000000000000000000..787cd7fa47b57fa81d39c19d8f949cd001c1ae9d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_147.dot
@@ -0,0 +1,46 @@
+digraph {
+	rankdir=RL
+	N0 [label="Risk Assessment" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Economic Recovery Initiatives" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N2 [label="Public Awareness Campaigns" color="#FFC085" fillcolor="#FFDAB9" shape=parallelogram style=filled]
+	N3 [label="Drone Deployment for Assessment" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N4 [label="Hazard Identification" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N5 [label="Satellite Imagery Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=plaintext style=filled]
+	N6 [label="Climate Change Adaptation for Disasters" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N7 [label="Debris Management" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N8 [label="Community Preparedness" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N9 [label="Resource Mobilization" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N10 [label="Early Recovery Actions" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Volunteer Coordination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Geographic Information Systems for Disasters" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest0_1 [label="Emergency Response" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=evacuates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=simulates color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=rescues color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N2 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label=reconstructs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=alerts color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_148.dot b/test/graphviz/scanned_medium/graphviz_148.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3c5b31cc11e1a630284100b4c0cf2152771cfe70
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_148.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=LR
+	N0 [label="Electronic Warfare" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Ground Operations" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N2 [label="Veteran Support" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N3 [label="Chaplain Services" color="#81C784" fillcolor="#F1F8E9" shape=oval style=filled]
+	N4 [label="Defense Procurement" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N5 [label=Demobilization color="#CB9BE1" fillcolor="#F2E6F5" shape=oval style=filled]
+	N6 [label="Family Support Programs" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N7 [label="Intelligence Gathering" color="#81C784" fillcolor="#F1F8E9" shape=plaintext style=filled]
+	N8 [label="Supply Chain Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=diamond style=filled]
+	N9 [label="Personnel Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#81C784" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Medical Support" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Troop Deployment" color="#D2D2D2" fillcolor="#F0F0F0" shape=hexagon style=filled]
+		nest0_1 [label="Disaster Relief Deployment" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest0_2 [label=Surveillance color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=monitors color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=researches color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=rescues color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=recruits color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=innovates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label=coordinates color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [label=assists color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_149.dot b/test/graphviz/scanned_medium/graphviz_149.dot
new file mode 100644
index 0000000000000000000000000000000000000000..137ded10a585921f0e32f4fb3a547565d249591e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_149.dot
@@ -0,0 +1,36 @@
+digraph {
+	rankdir=TD
+	N0 [label="Military Law" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label=Targeting color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N2 [label="Crisis Management" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N3 [label="Counter_Terrorism Operations" color="#BDBDBD" fillcolor="#F5F5F5" shape=parallelogram style=filled]
+	N4 [label="Intelligence Gathering" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N5 [label=Reconnaissance color="#BDBDBD" fillcolor="#F5F5F5" shape=folder style=filled]
+	N6 [label="Personnel Management" color="#00BCD4" fillcolor="#E0F7FA" shape=plaintext style=filled]
+	N7 [label="Force Projection" color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+	N8 [label="Civil_Military Cooperation" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Ground Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Logistics Support" color="#FF5722" fillcolor="#FFCCBC" shape=plaintext style=filled]
+		nest0_1 [label="Cyber Warfare Operations" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+		nest0_2 [label=Demobilization color="#00BCD4" fillcolor="#E0F7FA" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [label=assists color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=researches color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=interdicts color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_0 -> N3 [label=patrols color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_149.txt b/test/graphviz/scanned_medium/graphviz_149.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c7ace3c756e457c816bdb27019abc730fdb47aa2
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_149.txt
@@ -0,0 +1,18 @@
+<Counter_Terrorism Operations, connectedTo, Force Projection>
+<Counter_Terrorism Operations, connectedTo, Intelligence Gathering>
+<Counter_Terrorism Operations, connectedTo, Reconnaissance>
+<Crisis Management, researches, Counter_Terrorism Operations>
+<Cyber Warfare Operations, connectedTo, Demobilization>
+<Cyber Warfare Operations, partOf, Cyber Warfare Operations>
+<Demobilization, connectedTo, Personnel Management>
+<Demobilization, partOf, Demobilization>
+<Force Projection, connectedTo, Civil_Military Cooperation>
+<Intelligence Gathering, connectedTo, Reconnaissance>
+<Logistics Support, assists, Cyber Warfare Operations>
+<Logistics Support, partOf, Logistics Support>
+<Logistics Support, patrols, Counter_Terrorism Operations>
+<Military Law, connectedTo, Targeting>
+<Personnel Management, interdicts, Force Projection>
+<Reconnaissance, connectedTo, Personnel Management>
+<Targeting, connectedTo, Crisis Management>
+<Targeting, connectedTo, Logistics Support>
diff --git a/test/graphviz/scanned_medium/graphviz_15.dot b/test/graphviz/scanned_medium/graphviz_15.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c31d9d01ed7b5d12df4ec66d1ba398ec20931604
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_15.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=TD
+	N0 [label="Visual Effects" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N1 [label="Script Writing" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N2 [label="Press Junket" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N3 [label="Casting Call" color="#FFB2A5" fillcolor="#FFDCD6" shape=folder style=filled]
+	N4 [label="Audience Feedback" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N5 [label="Trailer Production" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N6 [label="Stunt Coordination" color="#D3EB9F" fillcolor="#F8FDD3" shape=oval style=filled]
+	N7 [label="Location Scouting" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N8 [label="Special Effects Design" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N9 [label="Streaming Setup" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N10 [label="Sound Engineering" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=creates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=negotiates color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=distributes color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=sponsors color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N9 [label=writes color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_15.txt b/test/graphviz/scanned_medium/graphviz_15.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f9521bcf37a8a21eeec0e8251f3c030162a2d4f3
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_15.txt
@@ -0,0 +1,11 @@
+<Audience Feedback, connectedTo, Trailer Production>
+<Casting Call, distributes, Audience Feedback>
+<Location Scouting, connectedTo, Special Effects Design>
+<Press Junket, negotiates, Casting Call>
+<Script Writing, creates, Press Junket>
+<Script Writing, writes, Streaming Setup>
+<Special Effects Design, sponsors, Streaming Setup>
+<Streaming Setup, connectedTo, Sound Engineering>
+<Stunt Coordination, connectedTo, Location Scouting>
+<Trailer Production, connectedTo, Stunt Coordination>
+<Visual Effects, connectedTo, Script Writing>
diff --git a/test/graphviz/scanned_medium/graphviz_151.dot b/test/graphviz/scanned_medium/graphviz_151.dot
new file mode 100644
index 0000000000000000000000000000000000000000..00f7124a216ba4d6cdb0afd0e5892b6edeb5d93a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_151.dot
@@ -0,0 +1,38 @@
+digraph {
+	rankdir=TD
+	N0 [label="Delay Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Aircraft De_icing" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N2 [label="Ground Support" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N3 [label="Aviation Safety Investigation" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N4 [label="Engine Overhaul" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	N5 [label="Fleet Management" color="#FF8A65" fillcolor="#FBE9E7" shape=oval style=filled]
+	N6 [label="Emergency Procedures Training" color="#BA68C8" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N7 [label="Unmanned Aerial Vehicle Integration" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="In_flight Service" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Air Traffic Control" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+		nest0_1 [label="Crew Resource Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+		nest0_2 [label="Airspace Management" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=lands color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#BA68C8" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=repairs color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [label=services color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [label=manages color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label=fuels color="#BA68C8" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_152.dot b/test/graphviz/scanned_medium/graphviz_152.dot
new file mode 100644
index 0000000000000000000000000000000000000000..310c17e6f86a9209a3a336ea470f4697903750b8
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_152.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=TD
+	N0 [label="Unmanned Aerial Vehicle Integration" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N1 [label="Airport Security Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N2 [label="Next_Generation Air Traffic Management" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N3 [label="Cargo Loading" color="#FFF8A6" fillcolor="#FFFDE0" shape=diamond style=filled]
+	N4 [label="Noise Abatement Procedures" color="#C2B2F0" fillcolor="#EFE6FF" shape=folder style=filled]
+	N5 [label="Remote Tower Operations" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N6 [label="Flight Planning" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N7 [label="Regulatory Compliance" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N8 [label="Weather Briefing" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N9 [label="Air Cargo Logistics" color="#C2B2F0" fillcolor="#EFE6FF" shape=plaintext style=filled]
+	N10 [label="Passenger Boarding" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Aircraft Maintenance" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Gate Assignment" color="#C2B2F0" fillcolor="#EFE6FF" shape=Mdiamond style=filled]
+		nest0_1 [label="Fleet Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_2 [label="Baggage Handling" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=regulates color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=reports color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=secures color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N8 [label=alerts color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label=lands color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_153.txt b/test/graphviz/scanned_medium/graphviz_153.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6d10993ac07954214cb7d48960a4a5f467710cbf
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_153.txt
@@ -0,0 +1,29 @@
+<Air Cargo Logistics, connectedTo, Passenger Boarding>
+<Air Cargo Logistics, schedules, Regulatory Compliance>
+<Air Traffic Control, connectedTo, Airport Security Management>
+<Aircraft Manufacturing, connectedTo, Passenger Boarding>
+<Aircraft Manufacturing, unloads, Air Traffic Control>
+<Airport Security Management, connectedTo, Sustainable Aviation Fuel Development>
+<Airspace Management, connectedTo, Aircraft Manufacturing>
+<Airspace Management, partOf, Airspace Management>
+<Baggage Handling, connectedTo, Engine Overhaul>
+<Baggage Handling, connectedTo, Unmanned Aerial Vehicle Integration>
+<Crew Scheduling, connectedTo, Air Traffic Control>
+<Crew Scheduling, connectedTo, Aircraft Manufacturing>
+<Crew Scheduling, connectedTo, Airport Security Management>
+<Crew Scheduling, connectedTo, Unmanned Aerial Vehicle Integration>
+<Engine Overhaul, connectedTo, Remote Tower Operations>
+<Fleet Management, audits, Airspace Management>
+<Fleet Management, partOf, Fleet Management>
+<Flight Simulation, connectedTo, Crew Scheduling>
+<Noise Abatement Procedures, boards, Aircraft Manufacturing>
+<Regulatory Compliance, connectedTo, Baggage Handling>
+<Regulatory Compliance, connectedTo, Fleet Management>
+<Remote Tower Operations, connectedTo, Airport Security Management>
+<Remote Tower Operations, connectedTo, Flight Simulation>
+<Remote Tower Operations, connectedTo, Passenger Boarding>
+<Remote Tower Operations, departs, Air Traffic Control>
+<Remote Tower Operations, loads, Unmanned Aerial Vehicle Integration>
+<Sustainable Aviation Fuel Development, manages, Passenger Boarding>
+<Unmanned Aerial Vehicle Integration, connectedTo, Noise Abatement Procedures>
+<Unmanned Aerial Vehicle Integration, connectedTo, Passenger Boarding>
diff --git a/test/graphviz/scanned_medium/graphviz_155.txt b/test/graphviz/scanned_medium/graphviz_155.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4a5264b689f01445b69d02da8eb6dcadf9388c11
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_155.txt
@@ -0,0 +1,24 @@
+<Altitude Tracking, connectedTo, Geocoding>
+<Altitude Tracking, partOf, Altitude Tracking>
+<Bearing and Distance Calculation, orients, GPS Positioning>
+<GPS Positioning, connectedTo, Turn_by_Turn Directions>
+<GPS Positioning, verifies, Traffic Information>
+<Geocoding, connectedTo, Multi_modal Navigation>
+<Hazard Alerts, connectedTo, Route Calculation>
+<Multi_modal Navigation, connectedTo, Navigation Data Update>
+<Multi_modal Navigation, connectedTo, Personalized Route Preferences>
+<Navigation Data Update, connectedTo, Offline Map Support>
+<Navigation Data Update, connectedTo, Satellite Navigation Systems>
+<Navigation Data Update, tracks, Terrestrial Navigation>
+<Offline Map Support, connectedTo, Wearable Device Navigation>
+<Personalized Route Preferences, connectedTo, Real_Time Re_routing>
+<Personalized Route Preferences, measures, Navigation Data Update>
+<Real_Time Re_routing, connectedTo, Navigation Data Update>
+<Real_Time Re_routing, connectedTo, Offline Map Support>
+<Real_Time Re_routing, connectedTo, Wearable Device Navigation>
+<Route Calculation, connectedTo, Geocoding>
+<Terrestrial Navigation, avoids, Offline Map Support>
+<Traffic Information, connectedTo, Hazard Alerts>
+<Turn_by_Turn Directions, connectedTo, Altitude Tracking>
+<Turn_by_Turn Directions, partOf, Turn_by_Turn Directions>
+<Wearable Device Navigation, connectedTo, Satellite Navigation Systems>
diff --git a/test/graphviz/scanned_medium/graphviz_156.dot b/test/graphviz/scanned_medium/graphviz_156.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d443ebd0bb7e9adb7836acae80cec3a9a0a97e84
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_156.dot
@@ -0,0 +1,56 @@
+digraph {
+	rankdir=BT
+	N0 [label="Augmented Reality Navigation" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Inertial Navigation System" color="#FFB74D" fillcolor="#FFF3E0" shape=folder style=filled]
+	N2 [label="Marine Charting" color="#FFB74D" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+	N3 [label="Reverse Geocoding" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N4 [label="Turn_by_Turn Directions" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N5 [label="Map Display" color="#FFB74D" fillcolor="#FFF3E0" shape=Mdiamond style=filled]
+	N6 [label="Altitude Tracking" color="#61CAC3" fillcolor="#C2E8E6" shape=plaintext style=filled]
+	N7 [label="Lane Guidance" color="#61CAC3" fillcolor="#C2E8E6" shape=hexagon style=filled]
+	N8 [label="Points of Interest Search" color="#61CAC3" fillcolor="#C2E8E6" shape=diamond style=filled]
+	N9 [label=Geofencing color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N10 [label="Autonomous Vehicle Navigation" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N11 [label="Pedestrian Navigation" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	S0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#61CAC3" fillcolor="#C2E8E6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Multi_modal Navigation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Terrestrial Navigation" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_1 [label="GPS Positioning" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_2 [label="Real_Time Re_routing" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_3 [label="Traffic Information" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=searches color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=alerts color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=predicts color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label=interprets color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [label=plots color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [label=identifies color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [label=transmits color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_157.txt b/test/graphviz/scanned_medium/graphviz_157.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8c5b83aa0cb1dc2a856508d220229e11eda64699
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_157.txt
@@ -0,0 +1,26 @@
+<Bioprinting, connectedTo, Printing Process>
+<Distributed Manufacturing, connectedTo, Maintenance and Repair of Printers>
+<Distributed Manufacturing, connectedTo, Reverse Engineering with 3D Printing>
+<Educational Applications, connectedTo, Mass Customization>
+<Educational Applications, connectedTo, On_Demand Production>
+<Educational Applications, connectedTo, Scaffolding for Tissue Engineering>
+<Food Printing, connectedTo, Slicing Software Operation>
+<Food Printing, partOf, Food Printing>
+<Intellectual Property Protection for Designs, connectedTo, Prototyping>
+<Maintenance and Repair of Printers, connectedTo, Scaffolding for Tissue Engineering>
+<Mass Customization, automates, Sustainable 3D Printing Materials>
+<Mass Customization, connectedTo, Printing Parameter Optimization>
+<On_Demand Production, connectedTo, Bioprinting>
+<Print Farm Management, connectedTo, Educational Applications>
+<Print Farm Management, connectedTo, Printing Parameter Optimization>
+<Printing Parameter Optimization, optimizes, Intellectual Property Protection for Designs>
+<Prototyping, connectedTo, Maintenance and Repair of Printers>
+<Prototyping, connectedTo, On_Demand Production>
+<Prototyping, connectedTo, Printing Process>
+<Reverse Engineering with 3D Printing, connectedTo, Print Farm Management>
+<Scaffolding for Tissue Engineering, connectedTo, On_Demand Production>
+<Slicing Software Operation, designs, Educational Applications>
+<Slicing Software Operation, partOf, Slicing Software Operation>
+<Sustainable 3D Printing Materials, connectedTo, Food Printing>
+<Sustainable 3D Printing Materials, manufactures, Maintenance and Repair of Printers>
+<Sustainable 3D Printing Materials, researches, Printing Parameter Optimization>
diff --git a/test/graphviz/scanned_medium/graphviz_158.txt b/test/graphviz/scanned_medium/graphviz_158.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9c460ae924a0704483588cdb56004fd63d30d96f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_158.txt
@@ -0,0 +1,16 @@
+<Additive Manufacturing, connectedTo, Selective Laser Sintering>
+<Additive Manufacturing, models, Sustainable 3D Printing Materials>
+<Custom Part Production, validates, Food Printing>
+<Digital Twin for 3D Prints, connectedTo, Distributed Manufacturing>
+<Digital Twin for 3D Prints, partOf, Digital Twin for 3D Prints>
+<Distributed Manufacturing, controls, Custom Part Production>
+<Food Printing, connectedTo, Medical Device Prototyping>
+<Food Printing, connectedTo, Sustainable 3D Printing Materials>
+<Maintenance and Repair of Printers, researches, Distributed Manufacturing>
+<Mass Customization, connectedTo, Maintenance and Repair of Printers>
+<Rapid Manufacturing, connectedTo, Additive Manufacturing>
+<Selective Laser Sintering, connectedTo, Distributed Manufacturing>
+<Selective Laser Sintering, connectedTo, Food Printing>
+<Selective Laser Sintering, connectedTo, Mass Customization>
+<Sustainable 3D Printing Materials, connectedTo, Digital Twin for 3D Prints>
+<Sustainable 3D Printing Materials, partOf, Sustainable 3D Printing Materials>
diff --git a/test/graphviz/scanned_medium/graphviz_159.txt b/test/graphviz/scanned_medium/graphviz_159.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d70aa840c5b7d34bfb5cc02fecff454c242747a1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_159.txt
@@ -0,0 +1,22 @@
+<3D Model Design, certifies, Material Research and Development>
+<3D Model Design, connectedTo, Construction 3D Printing>
+<3D Model Design, connectedTo, On_Demand Production>
+<3D Model Design, connectedTo, Troubleshooting Print Errors>
+<Additive Manufacturing, partOf, Additive Manufacturing>
+<Additive Manufacturing, shares, 3D Model Design>
+<File Format Conversion, connectedTo, 3D Model Design>
+<File Format Conversion, connectedTo, Intellectual Property Protection for Designs>
+<File Format Conversion, connectedTo, On_Demand Production>
+<File Format Conversion, enhances, Material Selection>
+<Intellectual Property Protection for Designs, connectedTo, 3D Model Design>
+<Material Research and Development, produces, Material Selection>
+<Material Selection, connectedTo, Construction 3D Printing>
+<On_Demand Production, connectedTo, Material Research and Development>
+<Print Farm Management, connectedTo, Additive Manufacturing>
+<Print Farm Management, partOf, Print Farm Management>
+<Reverse Engineering with 3D Printing, connectedTo, 3D Model Design>
+<Reverse Engineering with 3D Printing, connectedTo, File Format Conversion>
+<Stereolithography, partOf, Stereolithography>
+<Stereolithography, repairs, Print Farm Management>
+<Troubleshooting Print Errors, designs, Stereolithography>
+<Troubleshooting Print Errors, partOf, Troubleshooting Print Errors>
diff --git a/test/graphviz/scanned_medium/graphviz_16.dot b/test/graphviz/scanned_medium/graphviz_16.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a86511e95492079c8e06d3a808244bc9a72cd150
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_16.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=TD
+	N0 [label="Groundwater Monitoring" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N1 [label="Carbon Footprint Calculation" color="#607D8B" fillcolor="#CFD8DC" shape=oval style=filled]
+	N2 [label="Environmental Impact Assessment" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N3 [label="Hazardous Material Handling" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N4 [label="Pollution Control Technology" color="#A1D7CD" fillcolor="#EDF5F3" shape=plaintext style=filled]
+	N5 [label="Air Quality Monitoring" color="#607D8B" fillcolor="#CFD8DC" shape=Mdiamond style=filled]
+	N6 [label="Emission Reporting" color="#A1D7CD" fillcolor="#EDF5F3" shape=parallelogram style=filled]
+	N7 [label="Noise Pollution Measurement" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N8 [label="Climate Modeling" color="#607D8B" fillcolor="#CFD8DC" shape=hexagon style=filled]
+	N9 [label="Species Reintroduction" color="#A1887F" fillcolor="#EFEBE9" shape=hexagon style=filled]
+	N10 [label="Regulatory Compliance" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N0 -> N1 [label=advises color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=subsidizes color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=measures color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=analyzes color="#A1887F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=treats color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=licenses color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A1887F" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=implements color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N10 [label=surveys color="#A1887F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_160.txt b/test/graphviz/scanned_medium/graphviz_160.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0da30e1542251fa1463f73e030d9f97b4752e4bb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_160.txt
@@ -0,0 +1,23 @@
+<Atomic Force Microscopy, secures, Solar Cell Efficiency Enhancement>
+<Atomic Force Microscopy, synthesizes, Catalysis at Nanoscale>
+<Catalysis at Nanoscale, catalyzes, Nanomedicine Development>
+<Ethical Implications of Nanotech, connectedTo, Nanomedicine Development>
+<Ethical Implications of Nanotech, partOf, Ethical Implications of Nanotech>
+<Lab_on_a_Chip Devices, connectedTo, Ethical Implications of Nanotech>
+<Lab_on_a_Chip Devices, partOf, Lab_on_a_Chip Devices>
+<Nanomedicine Development, commercializes, Solar Cell Efficiency Enhancement>
+<Nanoparticle Characterization, connectedTo, Catalysis at Nanoscale>
+<Nanoparticle Characterization, connectedTo, Public Perception of Nanotechnology>
+<Nanoparticle Characterization, connectedTo, Solar Cell Efficiency Enhancement>
+<Nanoparticle Characterization, models, Transmission Electron Microscopy>
+<Nanosensors, communicates, Solar Cell Efficiency Enhancement>
+<Nanosensors, connectedTo, Nanoparticle Characterization>
+<Nanotoxicology, connectedTo, Atomic Force Microscopy>
+<Public Perception of Nanotechnology, assembles, Catalysis at Nanoscale>
+<Public Perception of Nanotechnology, connectedTo, Catalysis at Nanoscale>
+<Public Perception of Nanotechnology, connectedTo, Lab_on_a_Chip Devices>
+<Public Perception of Nanotechnology, connectedTo, Nanotoxicology>
+<Public Perception of Nanotechnology, connectedTo, Spintronics>
+<Public Perception of Nanotechnology, connectedTo, Transmission Electron Microscopy>
+<Spintronics, connectedTo, Nanotoxicology>
+<Transmission Electron Microscopy, develops, Spintronics>
diff --git a/test/graphviz/scanned_medium/graphviz_161.dot b/test/graphviz/scanned_medium/graphviz_161.dot
new file mode 100644
index 0000000000000000000000000000000000000000..59e94878c56e58c89a6b24685295f86649defe8f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_161.dot
@@ -0,0 +1,32 @@
+digraph {
+	rankdir=RL
+	N0 [label="Drug Delivery Systems" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Transmission Electron Microscopy" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+	N2 [label="Ethical Implications of Nanotech" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+	N3 [label="Energy Storage Applications" color="#FFD54F" fillcolor="#FFF8E1" shape=box style=filled]
+	N4 [label=Nanotoxicology color="#FFD54F" fillcolor="#FFF8E1" shape=ellipse style=filled]
+	S0 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Food Packaging Improvement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Molecular Self_Assembly" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+		nest0_1 [label="Regulatory Framework for Nanotech" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+		nest0_2 [label="X_ray Diffraction" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+		nest0_3 [label="Atomic Force Microscopy" color="#CFCFCF" fillcolor="#F6F6F6" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=engineers color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=complies color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label=protects color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_1 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N0 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_161.txt b/test/graphviz/scanned_medium/graphviz_161.txt
new file mode 100644
index 0000000000000000000000000000000000000000..61a6e2b06bda9df051ec47da5efe8abc9f878177
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_161.txt
@@ -0,0 +1,18 @@
+<Atomic Force Microscopy, connectedTo, Energy Storage Applications>
+<Atomic Force Microscopy, partOf, Atomic Force Microscopy>
+<Drug Delivery Systems, connectedTo, Nanotoxicology>
+<Drug Delivery Systems, connectedTo, Transmission Electron Microscopy>
+<Energy Storage Applications, complies, Nanotoxicology>
+<Energy Storage Applications, connectedTo, Regulatory Framework for Nanotech>
+<Energy Storage Applications, connectedTo, Transmission Electron Microscopy>
+<Energy Storage Applications, protects, Molecular Self_Assembly>
+<Ethical Implications of Nanotech, engineers, Energy Storage Applications>
+<Molecular Self_Assembly, connectedTo, Regulatory Framework for Nanotech>
+<Molecular Self_Assembly, partOf, Molecular Self_Assembly>
+<Regulatory Framework for Nanotech, connectedTo, X_ray Diffraction>
+<Regulatory Framework for Nanotech, partOf, Regulatory Framework for Nanotech>
+<Transmission Electron Microscopy, connectedTo, Energy Storage Applications>
+<Transmission Electron Microscopy, connectedTo, Ethical Implications of Nanotech>
+<Transmission Electron Microscopy, connectedTo, Nanotoxicology>
+<X_ray Diffraction, connectedTo, Atomic Force Microscopy>
+<X_ray Diffraction, partOf, X_ray Diffraction>
diff --git a/test/graphviz/scanned_medium/graphviz_163.dot b/test/graphviz/scanned_medium/graphviz_163.dot
new file mode 100644
index 0000000000000000000000000000000000000000..065c2475d9e2b560cbf201ed3d913dbbdc4372d3
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_163.dot
@@ -0,0 +1,48 @@
+digraph {
+	rankdir=BT
+	N0 [label="Quantum Bit Design" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N1 [label="Quantum Sensing" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N2 [label="Quantum Simulation" color="#FBC02D" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N3 [label="Quantum Software Development Kit" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N4 [label="Quantum Circuit Design" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Optimization Problems with Quantum Annealing" color="#FBC02D" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N6 [label="Quantum Key Distribution" color="#90A4AE" fillcolor="#ECEFF1" shape=parallelogram style=filled]
+	N7 [label="Quantum Computing Education" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+	N8 [label="Quantum Hardware Control" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+	N9 [label="Laser Cooling for Ions" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N10 [label="Quantum Coherence Management" color="#FFC085" fillcolor="#FFDAB9" shape=Mdiamond style=filled]
+	N11 [label="Post_Quantum Cryptography" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+	N12 [label="Quantum Computing for AI" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	M0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Photonic Qubits" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Trapped Ion Qubits" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest0_1 [label="Quantum Cryptography" color="#FFC085" fillcolor="#FFDAB9" shape=octagon style=filled]
+		nest0_2 [label="Microwave Control for Qubits" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_3 [label="Quantum Entanglement Generation" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [label=shares color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=applies color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=protects color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=optimizes color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=implements color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=uploads color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N11 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=secures color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N1 -> N9 [label=develops color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_164.dot b/test/graphviz/scanned_medium/graphviz_164.dot
new file mode 100644
index 0000000000000000000000000000000000000000..10530d34d1888d585e327628f998452dfe7792a7
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_164.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=RL
+	N0 [label="Quantum Computing Education" color="#00BCD4" fillcolor="#B2EBF2" shape=ellipse style=filled]
+	N1 [label="Quantum Communication Protocols" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+	N2 [label="Decoherence Mitigation" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N3 [label="Topological Qubits" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N4 [label="Optimization Problems with Quantum Annealing" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N5 [label="Quantum Sensing" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N6 [label="Cryogenic Systems for Qubits" color="#5C6BC0" fillcolor="#E8EAF6" shape=oval style=filled]
+	N7 [label="Financial Modeling with Quantum Computing" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N8 [label="Quantum Cloud Computing Services" color="#00BCD4" fillcolor="#B2EBF2" shape=oval style=filled]
+	N9 [label="Quantum Computing Benchmarking" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N10 [label="Material Science Simulations" color="#4285F4" fillcolor="#D0E0F8" shape=octagon style=filled]
+	N11 [label="Photonic Qubits" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Trapped Ion Qubits" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Quantum Entanglement Generation" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_1 [label="Quantum Circuit Design" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_2 [label="Quantum Simulation" color="#5C6BC0" fillcolor="#E8EAF6" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=accesses color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=optimizes color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=debugs color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=protects color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [label=processes color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label=applies color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [label=superposes color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_164.txt b/test/graphviz/scanned_medium/graphviz_164.txt
new file mode 100644
index 0000000000000000000000000000000000000000..757e4ce23ebd40cb66c5b30217c2f6769aefdb17
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_164.txt
@@ -0,0 +1,22 @@
+<Cryogenic Systems for Qubits, processes, Quantum Entanglement Generation>
+<Cryogenic Systems for Qubits, protects, Financial Modeling with Quantum Computing>
+<Decoherence Mitigation, optimizes, Topological Qubits>
+<Financial Modeling with Quantum Computing, connectedTo, Quantum Cloud Computing Services>
+<Material Science Simulations, connectedTo, Photonic Qubits>
+<Optimization Problems with Quantum Annealing, connectedTo, Quantum Sensing>
+<Quantum Circuit Design, accesses, Quantum Simulation>
+<Quantum Circuit Design, partOf, Quantum Circuit Design>
+<Quantum Cloud Computing Services, connectedTo, Quantum Computing Benchmarking>
+<Quantum Communication Protocols, connectedTo, Decoherence Mitigation>
+<Quantum Computing Benchmarking, connectedTo, Material Science Simulations>
+<Quantum Computing Education, connectedTo, Quantum Communication Protocols>
+<Quantum Entanglement Generation, connectedTo, Quantum Circuit Design>
+<Quantum Entanglement Generation, partOf, Quantum Entanglement Generation>
+<Quantum Sensing, connectedTo, Cryogenic Systems for Qubits>
+<Quantum Sensing, connectedTo, Photonic Qubits>
+<Quantum Sensing, connectedTo, Quantum Cloud Computing Services>
+<Quantum Simulation, connectedTo, Quantum Cloud Computing Services>
+<Quantum Simulation, partOf, Quantum Simulation>
+<Topological Qubits, applies, Quantum Computing Benchmarking>
+<Topological Qubits, debugs, Optimization Problems with Quantum Annealing>
+<Topological Qubits, superposes, Photonic Qubits>
diff --git a/test/graphviz/scanned_medium/graphviz_165.txt b/test/graphviz/scanned_medium/graphviz_165.txt
new file mode 100644
index 0000000000000000000000000000000000000000..35c633dbf5afd53b2fb17180bba3cdfecd249c6c
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_165.txt
@@ -0,0 +1,23 @@
+<Material Science Simulations, connectedTo, Quantum Processor Fabrication>
+<Quantum Advantage Demonstration, connectedTo, Quantum Algorithm Development>
+<Quantum Advantage Demonstration, connectedTo, Quantum Communication Protocols>
+<Quantum Advantage Demonstration, connectedTo, Quantum Simulation>
+<Quantum Algorithm Development, connectedTo, Quantum Simulation>
+<Quantum Algorithm Development, connectedTo, Quantum Supremacy Claims>
+<Quantum Algorithm Development, encrypts, Quantum Processor Fabrication>
+<Quantum Communication Protocols, connectedTo, Trapped Ion Qubits>
+<Quantum Computing Benchmarking, develops, Vacuum Systems for Trapped Ions>
+<Quantum Computing Benchmarking, partOf, Quantum Computing Benchmarking>
+<Quantum Cryptography, connectedTo, Quantum Advantage Demonstration>
+<Quantum Cryptography, solves, Quantum Simulation>
+<Quantum Entanglement Generation, connectedTo, Topological Qubits>
+<Quantum Entanglement Generation, partOf, Quantum Entanglement Generation>
+<Quantum Processor Fabrication, connectedTo, Superconducting Qubits>
+<Quantum Simulation, connectedTo, Material Science Simulations>
+<Quantum Simulation, connectedTo, Quantum Communication Protocols>
+<Quantum Supremacy Claims, connectedTo, Quantum Entanglement Generation>
+<Quantum Supremacy Claims, connectedTo, Quantum Simulation>
+<Superconducting Qubits, computes, Vacuum Systems for Trapped Ions>
+<Topological Qubits, implements, Quantum Computing Benchmarking>
+<Topological Qubits, partOf, Topological Qubits>
+<Vacuum Systems for Trapped Ions, corrects, Quantum Communication Protocols>
diff --git a/test/graphviz/scanned_medium/graphviz_166.dot b/test/graphviz/scanned_medium/graphviz_166.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5fa8ef3b50fc263acfdda2325181f67b56022382
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_166.dot
@@ -0,0 +1,42 @@
+digraph {
+	rankdir=TD
+	N0 [label="Software Development Kit Integration" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Educational Content Development" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N2 [label="Virtual Showrooms" color="#FFD54F" fillcolor="#FFF8E1" shape=Mdiamond style=filled]
+	N3 [label="Environment Mapping" color="#FFD54F" fillcolor="#FFF8E1" shape=folder style=filled]
+	N4 [label="Cloud_based AR or VR Rendering" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+	N5 [label="Industrial Maintenance Support" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="Comfort and Ergonomics Design" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+	N7 [label="Remote Collaboration Tools" color="#4DD0E1" fillcolor="#C9F0F0" shape=Mdiamond style=filled]
+	N8 [label="Augmented Reality App Development" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N9 [label="Training Simulations" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFD54F" fillcolor="#FFF8E1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Live Event Streaming in VR" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Hand Tracking and Interaction" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+		nest0_1 [label="Neuro_VR Interfaces" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+		nest0_2 [label="3D Model Creation" color="#FFD54F" fillcolor="#FFF8E1" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=programs color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=displays color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=interacts color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=maps color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_0 [label=captures color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N6 [label=educates color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=develops color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N3 [label=streamlines color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_166.txt b/test/graphviz/scanned_medium/graphviz_166.txt
new file mode 100644
index 0000000000000000000000000000000000000000..934fd1b883e7df03c11141f6dd36b9f85185f11d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_166.txt
@@ -0,0 +1,21 @@
+<3D Model Creation, educates, Comfort and Ergonomics Design>
+<3D Model Creation, partOf, 3D Model Creation>
+<Augmented Reality App Development, captures, Hand Tracking and Interaction>
+<Augmented Reality App Development, connectedTo, Training Simulations>
+<Cloud_based AR or VR Rendering, connectedTo, Industrial Maintenance Support>
+<Comfort and Ergonomics Design, connectedTo, Remote Collaboration Tools>
+<Educational Content Development, connectedTo, Environment Mapping>
+<Educational Content Development, displays, Virtual Showrooms>
+<Environment Mapping, maps, Cloud_based AR or VR Rendering>
+<Hand Tracking and Interaction, connectedTo, Neuro_VR Interfaces>
+<Hand Tracking and Interaction, partOf, Hand Tracking and Interaction>
+<Industrial Maintenance Support, connectedTo, Augmented Reality App Development>
+<Industrial Maintenance Support, connectedTo, Comfort and Ergonomics Design>
+<Industrial Maintenance Support, connectedTo, Training Simulations>
+<Neuro_VR Interfaces, partOf, Neuro_VR Interfaces>
+<Neuro_VR Interfaces, programs, 3D Model Creation>
+<Remote Collaboration Tools, connectedTo, Augmented Reality App Development>
+<Software Development Kit Integration, connectedTo, Educational Content Development>
+<Software Development Kit Integration, develops, Environment Mapping>
+<Training Simulations, streamlines, Environment Mapping>
+<Virtual Showrooms, interacts, Environment Mapping>
diff --git a/test/graphviz/scanned_medium/graphviz_167.txt b/test/graphviz/scanned_medium/graphviz_167.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b49e7570340f40e540aaa58d7f6c0838428683b8
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_167.txt
@@ -0,0 +1,21 @@
+<3D Model Creation, connectedTo, Hardware Prototyping>
+<Architectural Visualization, analyzes, Facial Recognition in AR or VR>
+<Architectural Visualization, connectedTo, Software Development Kit Integration>
+<Augmented Reality App Development, connectedTo, 3D Model Creation>
+<Data Visualization in AR or VR, creates, Environment Mapping>
+<Data Visualization in AR or VR, partOf, Data Visualization in AR or VR>
+<Environment Mapping, connectedTo, Field of View Optimization>
+<Environment Mapping, partOf, Environment Mapping>
+<Field of View Optimization, connectedTo, Augmented Reality App Development>
+<Hardware Prototyping, develops, Facial Recognition in AR or VR>
+<Multiplayer Experience Design, immerses, User Experience Testing>
+<Remote Collaboration Tools, connectedTo, Facial Recognition in AR or VR>
+<Remote Collaboration Tools, maps, Spatial Audio Implementation>
+<Retail Experience Enhancement, trains, Multiplayer Experience Design>
+<Software Development Kit Integration, connectedTo, Field of View Optimization>
+<Spatial Audio Implementation, connectedTo, Architectural Visualization>
+<Spatial Audio Implementation, connectedTo, Facial Recognition in AR or VR>
+<Spatial Audio Implementation, connectedTo, Hardware Prototyping>
+<Spatial Audio Implementation, controls, Data Visualization in AR or VR>
+<User Experience Testing, connectedTo, Remote Collaboration Tools>
+<Virtual Reality Game Development, captures, Retail Experience Enhancement>
diff --git a/test/graphviz/scanned_medium/graphviz_168.txt b/test/graphviz/scanned_medium/graphviz_168.txt
new file mode 100644
index 0000000000000000000000000000000000000000..200f6df79e03219a9e895cb42506c7b5c36de530
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_168.txt
@@ -0,0 +1,20 @@
+<3D Model Creation, connectedTo, Software Development Kit Integration>
+<AR for Navigation, overlays, Haptic Feedback Integration>
+<AR for Navigation, partOf, AR for Navigation>
+<Environment Mapping, connectedTo, Eye Tracking>
+<Eye Tracking, connectedTo, Immersive Storytelling>
+<Gesture Recognition, connectedTo, Eye Tracking>
+<Gesture Recognition, deploys, 3D Model Creation>
+<Gesture Recognition, tests, User Interface Design>
+<Haptic Feedback Integration, connectedTo, 3D Model Creation>
+<Haptic Feedback Integration, connects, Environment Mapping>
+<Multiplayer Experience Design, connectedTo, AR for Navigation>
+<Multiplayer Experience Design, partOf, Multiplayer Experience Design>
+<Software Development Kit Integration, visualizes, Virtual Showrooms>
+<Tracking System Calibration, connectedTo, Training Simulations>
+<Training Simulations, augments, Environment Mapping>
+<Training Simulations, connectedTo, Virtual Reality Game Development>
+<User Interface Design, connectedTo, Haptic Feedback Integration>
+<User Interface Design, connectedTo, Multiplayer Experience Design>
+<Virtual Reality Game Development, connectedTo, Environment Mapping>
+<Virtual Showrooms, tracks, Tracking System Calibration>
diff --git a/test/graphviz/scanned_medium/graphviz_17.dot b/test/graphviz/scanned_medium/graphviz_17.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b78a7941aff811cacf3fc4f20f6af017224b6a37
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_17.dot
@@ -0,0 +1,22 @@
+digraph {
+	rankdir=LR
+	N0 [label="Citizen Feedback" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N1 [label="Election Management" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N2 [label="Transparency Audit" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N3 [label="Legislation Review" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+	N4 [label="Data Publishing" color="#FFC085" fillcolor="#FFDAB9" shape=diamond style=filled]
+	N5 [label="Public Consultation" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N6 [label="ID Verification" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N7 [label="Driver's License Renewal" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Veterans Affairs" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N0 -> N1 [label=approves color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=registers color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=subsidizes color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=licenses color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_170.dot b/test/graphviz/scanned_medium/graphviz_170.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dd2a23a95d7db021869dbbd6972a998214fa0341
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_170.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=BT
+	N0 [label="Monetization Strategy" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Quality Assurance Testing" color="#5C6BC0" fillcolor="#E8EAF6" shape=oval style=filled]
+	N2 [label="Voice Acting" color="#388E3C" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N3 [label="Game Design" color="#388E3C" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N4 [label="Game Publishing" color="#388E3C" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N5 [label="Player Feedback Integration" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N6 [label="Virtual Reality Gaming" color="#388E3C" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+	N7 [label="Game Balancing" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="Player Progression Systems" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N9 [label="Game Analytics" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N10 [label="Character Design" color="#5C6BC0" fillcolor="#E8EAF6" shape=oval style=filled]
+	N11 [label="Physics Simulation" color="#388E3C" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N12 [label="Level Design" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Game Engine Customization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Engine Development" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_1 [label=Programming color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_2 [label="Marketing and Promotion" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=plays color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=scores color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=localizes color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=animates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=interacts color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N12 [label=researches color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_170.txt b/test/graphviz/scanned_medium/graphviz_170.txt
new file mode 100644
index 0000000000000000000000000000000000000000..427478c38085dec6f1420b01c0321288714a71bb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_170.txt
@@ -0,0 +1,23 @@
+<Character Design, connectedTo, Physics Simulation>
+<Engine Development, connectedTo, Programming>
+<Engine Development, partOf, Engine Development>
+<Game Analytics, connectedTo, Character Design>
+<Game Balancing, interacts, Player Progression Systems>
+<Game Design, localizes, Game Publishing>
+<Game Publishing, connectedTo, Player Feedback Integration>
+<Marketing and Promotion, partOf, Marketing and Promotion>
+<Marketing and Promotion, researches, Level Design>
+<Monetization Strategy, plays, Quality Assurance Testing>
+<Physics Simulation, connectedTo, Level Design>
+<Player Feedback Integration, animates, Virtual Reality Gaming>
+<Player Feedback Integration, connectedTo, Engine Development>
+<Player Feedback Integration, connectedTo, Game Balancing>
+<Player Feedback Integration, connectedTo, Physics Simulation>
+<Player Progression Systems, connectedTo, Character Design>
+<Player Progression Systems, connectedTo, Game Analytics>
+<Player Progression Systems, connectedTo, Physics Simulation>
+<Programming, connectedTo, Marketing and Promotion>
+<Programming, partOf, Programming>
+<Quality Assurance Testing, connectedTo, Voice Acting>
+<Virtual Reality Gaming, connectedTo, Game Balancing>
+<Voice Acting, scores, Game Design>
diff --git a/test/graphviz/scanned_medium/graphviz_171.dot b/test/graphviz/scanned_medium/graphviz_171.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8ae65c35e5a2c4018fea8068bd37f37a987194a9
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_171.dot
@@ -0,0 +1,49 @@
+digraph {
+	rankdir=TD
+	N0 [label="Virtual Reality Gaming" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Network Code Optimization" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N2 [label="PC Game Development" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N3 [label="Live Operations" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N4 [label="Player Progression Systems" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N5 [label="Game Balancing" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N6 [label="Game Performance Optimization" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N7 [label="Esports Event Organization" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N8 [label="Community Management" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N9 [label="Quality Assurance Testing" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+	N10 [label="Game Publishing" color="#9575CD" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N11 [label="Bug Fixing" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Monetization Strategy" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="In_Game Economy Design" color="#9575CD" fillcolor="#EDE7F6" shape=box style=filled]
+		nest0_1 [label="Character Design" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+		nest0_2 [label="Voice Acting" color="#9575CD" fillcolor="#EDE7F6" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=renders color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=markets color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=sponsors color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=streams color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=interacts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=broadcasts color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N2 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [label=competes color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S1 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_171.txt b/test/graphviz/scanned_medium/graphviz_171.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5d1cdc99be11c9fb9f009249351b8f24300ea6fa
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_171.txt
@@ -0,0 +1,24 @@
+<Character Design, partOf, Character Design>
+<Character Design, renders, Voice Acting>
+<Community Management, broadcasts, Quality Assurance Testing>
+<Community Management, connectedTo, Bug Fixing>
+<Community Management, connectedTo, Game Publishing>
+<Esports Event Organization, interacts, Community Management>
+<Game Balancing, sponsors, Game Performance Optimization>
+<Game Performance Optimization, streams, Esports Event Organization>
+<Game Publishing, connectedTo, Bug Fixing>
+<Game Publishing, connectedTo, In_Game Economy Design>
+<In_Game Economy Design, connectedTo, Character Design>
+<In_Game Economy Design, partOf, In_Game Economy Design>
+<Live Operations, connectedTo, Player Progression Systems>
+<Network Code Optimization, connectedTo, Community Management>
+<Network Code Optimization, connectedTo, PC Game Development>
+<PC Game Development, competes, Player Progression Systems>
+<PC Game Development, connectedTo, Community Management>
+<PC Game Development, markets, Live Operations>
+<Player Progression Systems, connectedTo, Game Balancing>
+<Quality Assurance Testing, connectedTo, Game Publishing>
+<Virtual Reality Gaming, connectedTo, Community Management>
+<Virtual Reality Gaming, connectedTo, Network Code Optimization>
+<Voice Acting, connectedTo, PC Game Development>
+<Voice Acting, partOf, Voice Acting>
diff --git a/test/graphviz/scanned_medium/graphviz_172.dot b/test/graphviz/scanned_medium/graphviz_172.dot
new file mode 100644
index 0000000000000000000000000000000000000000..78ec158933ccc354d3d9060b458fa1ba7d7bf087
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_172.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=LR
+	N0 [label="Music Licensing" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Music Production" color="#6EB76D" fillcolor="#E9F7E8" shape=parallelogram style=filled]
+	N2 [label="Music Distribution" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N3 [label="Streaming Platform Management" color="#6EB76D" fillcolor="#E9F7E8" shape=Mdiamond style=filled]
+	N4 [label=Arrangement color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N5 [label="Music Publishing" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+	N6 [label="Music Theory Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=oval style=filled]
+	N7 [label="Beat Making" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Artist Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Concert Promotion" color="#FF9800" fillcolor="#FFE0B2" shape=diamond style=filled]
+		nest0_1 [label=Sampling color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest0_2 [label="Music Education" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=generates color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label=scores color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [label=mixes color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=captures color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [label=produces color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N5 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_172.txt b/test/graphviz/scanned_medium/graphviz_172.txt
new file mode 100644
index 0000000000000000000000000000000000000000..28ceb7675b5fa015e7c3a711fe84a5e10b877706
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_172.txt
@@ -0,0 +1,18 @@
+<Arrangement, connectedTo, Music Publishing>
+<Concert Promotion, connectedTo, Sampling>
+<Concert Promotion, partOf, Concert Promotion>
+<Music Distribution, captures, Music Publishing>
+<Music Distribution, connectedTo, Streaming Platform Management>
+<Music Distribution, produces, Arrangement>
+<Music Education, mixes, Music Distribution>
+<Music Education, partOf, Music Education>
+<Music Licensing, connectedTo, Music Production>
+<Music Licensing, connectedTo, Music Publishing>
+<Music Production, connectedTo, Music Distribution>
+<Music Publishing, connectedTo, Music Theory Analysis>
+<Music Theory Analysis, connectedTo, Beat Making>
+<Sampling, generates, Music Education>
+<Sampling, partOf, Sampling>
+<Streaming Platform Management, connectedTo, Arrangement>
+<Streaming Platform Management, connectedTo, Music Publishing>
+<Streaming Platform Management, scores, Concert Promotion>
diff --git a/test/graphviz/scanned_medium/graphviz_173.dot b/test/graphviz/scanned_medium/graphviz_173.dot
new file mode 100644
index 0000000000000000000000000000000000000000..639f324300db7674485b21571a8592d75f284890
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_173.dot
@@ -0,0 +1,47 @@
+digraph {
+	rankdir=RL
+	N0 [label="Digital Audio Workstation Operation" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label=Mastering color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N2 [label="Music Theory Analysis" color="#03A9F4" fillcolor="#B3E5FC" shape=oval style=filled]
+	N3 [label="Crowdfunding for Music Projects" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N4 [label="Music Licensing" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label=Ticketing color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N6 [label="Copyright Management" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N7 [label="Beat Making" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N8 [label="Music Production" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	S0 [label="" color="#FFB74D" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Concert Promotion" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Royalty Collection" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_1 [label="Music Festival Organization" color="#03A9F4" fillcolor="#B3E5FC" shape=Mdiamond style=filled]
+		nest0_2 [label=Composition color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label=produces color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
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+	N0 -> N1 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
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+	N6 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [label=audits color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N6 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
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+	S0 -> N7 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label=engineers color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label=performs color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_176.txt b/test/graphviz/scanned_medium/graphviz_176.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fcf804bdaca38ea8c31f66484c2eddb00b585878
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_176.txt
@@ -0,0 +1,23 @@
+<Budget Management, animates, Crew Management>
+<Budget Management, connectedTo, Digital Asset Management>
+<Budget Management, connectedTo, Screenwriting Workshops>
+<Budget Management, protects, Film Festival Submission>
+<Crew Management, connectedTo, Script Development>
+<Digital Asset Management, connectedTo, Pre_production Planning>
+<Digital Asset Management, connectedTo, Screenwriting Workshops>
+<Distribution Strategy, connectedTo, Tax Incentive Management>
+<Film Festival Submission, audits, Digital Asset Management>
+<Film Financing, connectedTo, Distribution Strategy>
+<Insurance Management, connectedTo, Virtual Production Techniques>
+<Insurance Management, partOf, Insurance Management>
+<Pre_production Planning, connectedTo, Insurance Management>
+<Pre_production Planning, partOf, Pre_production Planning>
+<Screenwriting Workshops, connectedTo, Lighting Design>
+<Script Development, connectedTo, Film Festival Submission>
+<Set Construction, connectedTo, Digital Asset Management>
+<Set Construction, connectedTo, Screenwriting Workshops>
+<Set Construction, sounds, Budget Management>
+<Tax Incentive Management, connectedTo, Set Construction>
+<Tax Incentive Management, coordinates, Film Festival Submission>
+<Virtual Production Techniques, partOf, Virtual Production Techniques>
+<Virtual Production Techniques, renders, Set Construction>
diff --git a/test/graphviz/scanned_medium/graphviz_177.txt b/test/graphviz/scanned_medium/graphviz_177.txt
new file mode 100644
index 0000000000000000000000000000000000000000..25455f749e67f29b25ba8c8dc8e645fffb479720
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_177.txt
@@ -0,0 +1,25 @@
+<Budget Management, connectedTo, Film Festival Submission>
+<Budget Management, connectedTo, Green Production Practices>
+<Directing, animates, Film Financing>
+<Film Festival Submission, connectedTo, Location Scouting>
+<Film Festival Submission, partOf, Film Festival Submission>
+<Film Financing, connectedTo, Talent Negotiation>
+<Film Financing, screens, Production Scheduling>
+<Green Production Practices, negotiates, Remote Collaboration Tools>
+<Lighting Design, connectedTo, Production Scheduling>
+<Location Scouting, partOf, Location Scouting>
+<Location Scouting, post_produces, Production Accounting>
+<Makeup and Hair Design, connectedTo, Lighting Design>
+<Pre_production Planning, connectedTo, Casting>
+<Production Accounting, connectedTo, Lighting Design>
+<Production Accounting, partOf, Production Accounting>
+<Production Scheduling, color grades, Budget Management>
+<Production Scheduling, connectedTo, Pre_production Planning>
+<Production Scheduling, connectedTo, Special Effects>
+<Remote Collaboration Tools, connectedTo, Pre_production Planning>
+<Special Effects, connectedTo, Stunt Coordination>
+<Stunt Coordination, connectedTo, Budget Management>
+<Talent Negotiation, connectedTo, Production Scheduling>
+<Talent Negotiation, distributes, Makeup and Hair Design>
+<Talent Negotiation, manages, Production Scheduling>
+<Talent Negotiation, uploads, Pre_production Planning>
diff --git a/test/graphviz/scanned_medium/graphviz_179.dot b/test/graphviz/scanned_medium/graphviz_179.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9281a0e8e361f646ffcfce647e36ec341ac32dac
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_179.dot
@@ -0,0 +1,41 @@
+digraph {
+	rankdir=TD
+	N0 [label=Fact_Checking color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Content Repurposing" color="#BDBDBD" fillcolor="#F5F5F5" shape=Mdiamond style=filled]
+	N2 [label="Content Strategy Development" color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N3 [label="Graphic Design" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N4 [label="Distribution Planning" color="#BDBDBD" fillcolor="#F5F5F5" shape=hexagon style=filled]
+	N5 [label=Photography color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N6 [label="Podcast Production" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	S0 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_1 [label="E_book Writing" color="#FBC02D" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_2 [label=Copywriting color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_3 [label="Research and Outline" color="#FBC02D" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=curates color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label=ideates color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	N0 -> N1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
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+	N5 -> N6 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [label=measures color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
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+	S0 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S1 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [label=proofreads color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [label=tracks color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#FBC02D" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=outlines color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#FBC02D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_179.txt b/test/graphviz/scanned_medium/graphviz_179.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1364c6df34fb3d8f470385b40a85abef1ca2b5b6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_179.txt
@@ -0,0 +1,20 @@
+<Audience Analysis, connectedTo, E_book Writing>
+<Audience Analysis, partOf, Audience Analysis>
+<Content Repurposing, designs, Content Strategy Development>
+<Content Strategy Development, connectedTo, Distribution Planning>
+<Content Strategy Development, connectedTo, Graphic Design>
+<Content Strategy Development, connectedTo, Photography>
+<Copywriting, ideates, Research and Outline>
+<Copywriting, partOf, Copywriting>
+<Distribution Planning, connectedTo, Photography>
+<E_book Writing, curates, Copywriting>
+<E_book Writing, partOf, E_book Writing>
+<Fact_Checking, connectedTo, Content Repurposing>
+<Fact_Checking, outlines, Distribution Planning>
+<Graphic Design, connectedTo, Distribution Planning>
+<Graphic Design, proofreads, Podcast Production>
+<Graphic Design, tracks, Photography>
+<Photography, connectedTo, Audience Analysis>
+<Photography, connectedTo, Podcast Production>
+<Research and Outline, measures, Content Repurposing>
+<Research and Outline, partOf, Research and Outline>
diff --git a/test/graphviz/scanned_medium/graphviz_180.txt b/test/graphviz/scanned_medium/graphviz_180.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2fa335533ff753db02f95f310715ea457b214a26
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_180.txt
@@ -0,0 +1,22 @@
+<Content Strategy Development, connectedTo, Voice Acting or Narration>
+<Distribution Planning, connectedTo, Ideation and Brainstorming>
+<Distribution Planning, partOf, Distribution Planning>
+<Drafting Content, interviews, Distribution Planning>
+<Drafting Content, partOf, Drafting Content>
+<Fact_Checking, connectedTo, Ideation and Brainstorming>
+<Fact_Checking, shares, Videography>
+<Graphic Design, proofreads, Videography>
+<Ideation and Brainstorming, connectedTo, Content Strategy Development>
+<Ideation and Brainstorming, connectedTo, Keyword Research>
+<Ideation and Brainstorming, ideates, Graphic Design>
+<Influencer Collaboration, connectedTo, Content Strategy Development>
+<Keyword Research, connectedTo, Video Scripting>
+<Video Scripting, connectedTo, Audience Engagement>
+<Video Scripting, connectedTo, Graphic Design>
+<Video Scripting, connectedTo, Influencer Collaboration>
+<Video Scripting, connectedTo, Voice Acting or Narration>
+<Video Scripting, designs, Drafting Content>
+<Video Scripting, optimizes, Videography>
+<Videography, connectedTo, Audience Engagement>
+<Voice Acting or Narration, connectedTo, Videography>
+<Voice Acting or Narration, publishes, Graphic Design>
diff --git a/test/graphviz/scanned_medium/graphviz_181.txt b/test/graphviz/scanned_medium/graphviz_181.txt
new file mode 100644
index 0000000000000000000000000000000000000000..eb5c91d0c8813100fcad4abadd442c6b534fc5c8
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_181.txt
@@ -0,0 +1,22 @@
+<Big Data Processing, connectedTo, Cloud_based Data Platforms>
+<Cloud_based Data Platforms, connectedTo, Risk Analytics>
+<Data Mining, partOf, Data Mining>
+<Data Mining, visualizes, HR Data Analytics>
+<Data Pipeline Development, connectedTo, Risk Analytics>
+<Data Pipeline Development, pipelines, Data Visualization>
+<Data Visualization, connectedTo, Risk Analytics>
+<Data Visualization, connectedTo, Sentiment Analysis>
+<Data Visualization, correlates, Prescriptive Analytics>
+<Exploratory Data Analysis, connectedTo, Prescriptive Analytics>
+<Exploratory Data Analysis, mines, Time Series Forecasting>
+<HR Data Analytics, connectedTo, Cloud_based Data Platforms>
+<HR Data Analytics, partOf, HR Data Analytics>
+<Marketing Campaign Analysis, connectedTo, Cloud_based Data Platforms>
+<Marketing Campaign Analysis, connectedTo, Prescriptive Analytics>
+<Marketing Campaign Analysis, tracks, Exploratory Data Analysis>
+<Prescriptive Analytics, audits, Big Data Processing>
+<Report Generation, connectedTo, Marketing Campaign Analysis>
+<Risk Analytics, connectedTo, Sales Performance Analysis>
+<Sentiment Analysis, connectedTo, Report Generation>
+<Time Series Forecasting, connectedTo, Data Mining>
+<Time Series Forecasting, connectedTo, Prescriptive Analytics>
diff --git a/test/graphviz/scanned_medium/graphviz_185.dot b/test/graphviz/scanned_medium/graphviz_185.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d39b7e0b5edb05b0a607e2d43edbe26b73ead3a9
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_185.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=TD
+	N0 [label="Customer Behavior Insights" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Master Data Management" color="#FFE69C" fillcolor="#FFF9D4" shape=oval style=filled]
+	N2 [label="Report Automation" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N3 [label="Budget Performance Analysis" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N4 [label="Performance Monitoring" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+	N5 [label="ETL Development" color="#FFE69C" fillcolor="#FFF9D4" shape=plaintext style=filled]
+	N6 [label="Supply Chain Optimization" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N7 [label="Regulatory Compliance Reporting" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	S0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_1 [label="Data Storytelling for Business" color="#FFE69C" fillcolor="#FFF9D4" shape=octagon style=filled]
+		nest0_2 [label="Data Mart Design" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
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+	S0 -> N6 [label=integrates color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label=models color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label=self_serves color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label=automates color="#FFE69C" dir=forward penwidth=1.5 style=solid]
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diff --git a/test/graphviz/scanned_medium/graphviz_185.txt b/test/graphviz/scanned_medium/graphviz_185.txt
new file mode 100644
index 0000000000000000000000000000000000000000..abc54ab6729e4bfe2af961ac558957958ba9f33a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_185.txt
@@ -0,0 +1,21 @@
+<Budget Performance Analysis, connectedTo, Performance Monitoring>
+<Budget Performance Analysis, integrates, Supply Chain Optimization>
+<Budget Performance Analysis, models, Regulatory Compliance Reporting>
+<Budget Performance Analysis, self_serves, ETL Development>
+<Customer Behavior Insights, connectedTo, ETL Development>
+<Customer Behavior Insights, connectedTo, Master Data Management>
+<Data Mart Design, connectedTo, Financial Performance Reporting>
+<Data Mart Design, partOf, Data Mart Design>
+<Data Storytelling for Business, connectedTo, Data Mart Design>
+<Data Storytelling for Business, partOf, Data Storytelling for Business>
+<ETL Development, monitors, Supply Chain Optimization>
+<Financial Performance Reporting, partOf, Financial Performance Reporting>
+<Financial Performance Reporting, recommends, Report Automation>
+<Master Data Management, automates, ETL Development>
+<Master Data Management, connectedTo, Report Automation>
+<Master Data Management, connectedTo, Sales Forecasting>
+<Performance Monitoring, extracts, ETL Development>
+<Report Automation, connectedTo, Budget Performance Analysis>
+<Sales Forecasting, connectedTo, Data Storytelling for Business>
+<Sales Forecasting, partOf, Sales Forecasting>
+<Supply Chain Optimization, connectedTo, Regulatory Compliance Reporting>
diff --git a/test/graphviz/scanned_medium/graphviz_186.dot b/test/graphviz/scanned_medium/graphviz_186.dot
new file mode 100644
index 0000000000000000000000000000000000000000..633e2af07572f923ad921fe18811924f3f789135
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_186.dot
@@ -0,0 +1,49 @@
+digraph {
+	rankdir=TD
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+	N1 [label="Supply Chain Optimization" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N2 [label="ETL Development" color="#BDBDBD" fillcolor="#F5F5F5" shape=folder style=filled]
+	N3 [label="Actionable Insights Generation" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N4 [label="Operational Efficiency Measurement" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N5 [label="Strategic Planning Support" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N6 [label="Master Data Management" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N7 [label="Sales Forecasting" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	N8 [label="Mobile BI Development" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N9 [label="Dashboard Design" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N10 [label="KPI Definition" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	N11 [label="Report Automation" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	S0 [label="" color="#BDBDBD" fillcolor="#F5F5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="OLAP Cube Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Data Mart Design" color="#BDBDBD" fillcolor="#F5F5F5" shape=oval style=filled]
+		nest0_1 [label="Data Lineage Tracking" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+		nest0_2 [label="Customer Behavior Insights" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label=supports color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=manages color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=trains color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=insights color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=OLAPs color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [label=models color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [label=audits color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_187.dot b/test/graphviz/scanned_medium/graphviz_187.dot
new file mode 100644
index 0000000000000000000000000000000000000000..cd597eee55b52e336eb5bd93f309575d64d7f751
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_187.dot
@@ -0,0 +1,48 @@
+digraph {
+	rankdir=RL
+	N0 [label="Market Research" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N1 [label="Marketing Automation" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+	N2 [label="Competitive Analysis" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N3 [label="Experiential Marketing" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N4 [label="Search Engine Optimization" color="#F7BEE0" fillcolor="#FAEBF3" shape=folder style=filled]
+	N5 [label="Brand Strategy Development" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N6 [label="Customer Segmentation" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N7 [label="Marketing Budget Allocation" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N8 [label="Social Media Marketing" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N9 [label="Loyalty Programs" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N10 [label="Target Audience Identification" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N11 [label="Brand Reputation Management" color="#A188D0" fillcolor="#DACBE3" shape=octagon style=filled]
+	N12 [label="Affiliate Marketing" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Promotional Campaigns" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Content Marketing" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+		nest0_1 [label="Personalization Strategies" color="#66BB6A" fillcolor="#E8F5E9" shape=diamond style=filled]
+		nest0_2 [label="Influencer Marketing" color="#66BB6A" fillcolor="#E8F5E9" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [label="optimizes SEO" color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=influences color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=brands color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="manages reputation" color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="enhances experiences" color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [label="promotes sales" color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N10 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label="distributes products" color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_187.txt b/test/graphviz/scanned_medium/graphviz_187.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bcb00f2464b7ff30b078d8c8da0d1ffe7a30470e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_187.txt
@@ -0,0 +1,24 @@
+<Brand Reputation Management, connectedTo, Affiliate Marketing>
+<Brand Strategy Development, brands, Customer Segmentation>
+<Competitive Analysis, connectedTo, Experiential Marketing>
+<Competitive Analysis, connectedTo, Social Media Marketing>
+<Content Marketing, optimizes SEO, Personalization Strategies>
+<Content Marketing, partOf, Content Marketing>
+<Customer Segmentation, connectedTo, Marketing Budget Allocation>
+<Customer Segmentation, connectedTo, Social Media Marketing>
+<Experiential Marketing, connectedTo, Brand Reputation Management>
+<Experiential Marketing, connectedTo, Customer Segmentation>
+<Experiential Marketing, connectedTo, Search Engine Optimization>
+<Experiential Marketing, distributes products, Marketing Budget Allocation>
+<Influencer Marketing, connectedTo, Target Audience Identification>
+<Influencer Marketing, partOf, Influencer Marketing>
+<Loyalty Programs, connectedTo, Target Audience Identification>
+<Market Research, influences, Marketing Automation>
+<Marketing Automation, connectedTo, Competitive Analysis>
+<Marketing Budget Allocation, manages reputation, Social Media Marketing>
+<Marketing Budget Allocation, promotes sales, Content Marketing>
+<Personalization Strategies, connectedTo, Influencer Marketing>
+<Personalization Strategies, partOf, Personalization Strategies>
+<Search Engine Optimization, connectedTo, Brand Strategy Development>
+<Social Media Marketing, enhances experiences, Loyalty Programs>
+<Target Audience Identification, connectedTo, Brand Reputation Management>
diff --git a/test/graphviz/scanned_medium/graphviz_189.dot b/test/graphviz/scanned_medium/graphviz_189.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3d326c22049de1ea1dee142600a4a89ab9a8a98f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_189.dot
@@ -0,0 +1,40 @@
+digraph {
+	rankdir=LR
+	N0 [label="Loyalty Programs" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Mobile Marketing" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N2 [label="Partnership Marketing" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+	N3 [label="Marketing Budget Allocation" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N4 [label="Brand Reputation Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N5 [label="Customer Segmentation" color="#FFCC7A" fillcolor="#FFF6D9" shape=plaintext style=filled]
+	N6 [label="Campaign Performance Tracking" color="#FFCC7A" fillcolor="#FFF6D9" shape=plaintext style=filled]
+	N7 [label="Website Design and Optimization" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N8 [label="Promotional Campaigns" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#8C9EFF" fillcolor="#D3D7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Search Engine Marketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Event Marketing" color="#42A5F5" fillcolor="#F1F8FF" shape=parallelogram style=filled]
+		nest0_1 [label="Target Audience Identification" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest0_2 [label="Marketing Automation" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [label="analyzes data" color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="podcast marketing" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N1 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [label="personalizes content" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label="sends emails" color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label="creates content" color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_189.txt b/test/graphviz/scanned_medium/graphviz_189.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e6bc8ecf1f065d2e7c819ca80deed06b0c6dd64c
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_189.txt
@@ -0,0 +1,20 @@
+<Brand Reputation Management, connectedTo, Customer Segmentation>
+<Brand Reputation Management, connectedTo, Website Design and Optimization>
+<Brand Reputation Management, personalizes content, Campaign Performance Tracking>
+<Brand Reputation Management, sends emails, Promotional Campaigns>
+<Campaign Performance Tracking, connectedTo, Website Design and Optimization>
+<Customer Segmentation, connectedTo, Campaign Performance Tracking>
+<Customer Segmentation, connectedTo, Event Marketing>
+<Event Marketing, analyzes data, Target Audience Identification>
+<Event Marketing, partOf, Event Marketing>
+<Loyalty Programs, connectedTo, Marketing Budget Allocation>
+<Loyalty Programs, connectedTo, Mobile Marketing>
+<Marketing Automation, connectedTo, Mobile Marketing>
+<Marketing Automation, partOf, Marketing Automation>
+<Marketing Budget Allocation, connectedTo, Brand Reputation Management>
+<Mobile Marketing, connectedTo, Partnership Marketing>
+<Mobile Marketing, creates content, Marketing Budget Allocation>
+<Partnership Marketing, podcast marketing, Marketing Budget Allocation>
+<Target Audience Identification, connectedTo, Marketing Automation>
+<Target Audience Identification, partOf, Target Audience Identification>
+<Website Design and Optimization, connectedTo, Promotional Campaigns>
diff --git a/test/graphviz/scanned_medium/graphviz_19.dot b/test/graphviz/scanned_medium/graphviz_19.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9c50cb71a4274a83b495ca19c82dc18106d4baa7
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_19.dot
@@ -0,0 +1,22 @@
+digraph {
+	rankdir=BT
+	N0 [label="Road Testing" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N1 [label="Quality Assurance" color="#42A5F5" fillcolor="#F1F8FF" shape=folder style=filled]
+	N2 [label="Fluid Level Check" color="#42A5F5" fillcolor="#F1F8FF" shape=folder style=filled]
+	N3 [label="Fuel Efficiency Check" color="#FF5722" fillcolor="#FFCCBC" shape=Mdiamond style=filled]
+	N4 [label="Warranty Activation" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N5 [label="Maintenance Scheduling" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N6 [label="Recall Management" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N7 [label="Inventory Tracking" color="#FF5722" fillcolor="#FFCCBC" shape=hexagon style=filled]
+	N8 [label="Supplier Selection" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N0 -> N1 [label=manufactures color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=assembles color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=prototypes color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=tests color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=delivers color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N2 -> N8 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N6 -> N0 [label=services color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_19.txt b/test/graphviz/scanned_medium/graphviz_19.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7e782078f7d91a5283c2e5a28f78b49345ed016d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_19.txt
@@ -0,0 +1,10 @@
+<Fluid Level Check, assembles, Fuel Efficiency Check>
+<Fluid Level Check, connectedTo, Supplier Selection>
+<Fuel Efficiency Check, connectedTo, Warranty Activation>
+<Inventory Tracking, delivers, Supplier Selection>
+<Maintenance Scheduling, tests, Recall Management>
+<Quality Assurance, connectedTo, Fluid Level Check>
+<Recall Management, connectedTo, Inventory Tracking>
+<Recall Management, services, Road Testing>
+<Road Testing, manufactures, Quality Assurance>
+<Warranty Activation, prototypes, Maintenance Scheduling>
diff --git a/test/graphviz/scanned_medium/graphviz_190.txt b/test/graphviz/scanned_medium/graphviz_190.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9202831ef9aacffd38cdf82154c0754297fcc64d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_190.txt
@@ -0,0 +1,22 @@
+<Audience Segmentation for Ads, connectedTo, Performance Tracking>
+<Audience Segmentation for Ads, connectedTo, Programmatic Advertising>
+<Audience Segmentation for Ads, connectedTo, Video Advertising>
+<Audience Segmentation for Ads, implements retargeting, Digital Advertising>
+<Audience Targeting, connectedTo, Search Engine Ads>
+<Audience Targeting, creates ads, Digital Advertising>
+<Budget Management, detects fraud, Demographic Targeting>
+<Budget Management, partOf, Budget Management>
+<Competitor Ad Analysis, connectedTo, Social Media Ads>
+<Customer Acquisition Cost Analysis, connectedTo, Competitor Ad Analysis>
+<Demographic Targeting, connectedTo, Video Advertising>
+<Demographic Targeting, partOf, Demographic Targeting>
+<Digital Advertising, television ads, Media Buying>
+<Geo_Targeting, connectedTo, Digital Advertising>
+<Performance Tracking, connectedTo, Geo_Targeting>
+<Performance Tracking, manages budgets, Digital Advertising>
+<Programmatic Advertising, connectedTo, Customer Acquisition Cost Analysis>
+<Search Engine Ads, targets psychographics, Audience Segmentation for Ads>
+<Social Media Ads, connectedTo, Budget Management>
+<Social Media Ads, connectedTo, Digital Advertising>
+<Social Media Ads, connectedTo, Performance Tracking>
+<Video Advertising, connectedTo, Programmatic Advertising>
diff --git a/test/graphviz/scanned_medium/graphviz_192.dot b/test/graphviz/scanned_medium/graphviz_192.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f37e961f16926cd78933059f225a302081cc5a11
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_192.dot
@@ -0,0 +1,41 @@
+digraph {
+	rankdir=LR
+	N0 [label="Performance Tracking" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label="Audience Segmentation for Ads" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N2 [label="Display Advertising" color="#DCE775" fillcolor="#FCFCE7" shape=folder style=filled]
+	N3 [label=Geo_Targeting color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N4 [label="Ad Analytics Reporting" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N5 [label="Digital Advertising" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N6 [label="Campaign Planning" color="#FFF9AE" fillcolor="#FFFCE6" shape=octagon style=filled]
+	N7 [label="Print Advertising" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N8 [label="Fraud Detection in Ads" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	S0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Interactive Ad Formats" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Competitor Ad Analysis" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_1 [label="Outdoor Advertising" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="television ads" color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label="measures ROAS" color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label="segments audiences" color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_194.dot b/test/graphviz/scanned_medium/graphviz_194.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d0f5415ce567c41bfab6fe8fea299a9f043173f6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_194.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=TD
+	N0 [label="Smart Contract Development" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Tokenomics Design" color="#80DDEA" fillcolor="#D3F7F9" shape=oval style=filled]
+	N2 [label="Zero_Knowledge Proofs" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N3 [label="Oracles Integration" color="#E91E63" fillcolor="#F8BBD0" shape=plaintext style=filled]
+	N4 [label="Intellectual Property Management" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N5 [label="Consortium Blockchain Setup" color="#E91E63" fillcolor="#F8BBD0" shape=parallelogram style=filled]
+	N6 [label="Voting Systems on Blockchain" color="#D2D2D2" fillcolor="#F0F0F0" shape=parallelogram style=filled]
+	N7 [label="Decentralized Network Design" color="#D2D2D2" fillcolor="#F0F0F0" shape=plaintext style=filled]
+	N8 [label="Enterprise Blockchain Solutions" color="#D2D2D2" fillcolor="#F0F0F0" shape=parallelogram style=filled]
+	N9 [label="Gaming on Blockchain" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N10 [label="Supply Chain Traceability" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N11 [label="Governance Models for Blockchains" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N12 [label="Transaction Verification" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#E91E63" fillcolor="#F8BBD0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Non_Fungible Token Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Public Blockchain Deployment" color="#80DDEA" fillcolor="#D3F7F9" shape=parallelogram style=filled]
+		nest0_1 [label="Real Estate Tokenization" color="#80DDEA" fillcolor="#D3F7F9" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="secures health data" color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="identifies users" color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="develops layer_2s" color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label="traces provenance" color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N1 [label="supports DeFi" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [label="tokenizes assets" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_194.txt b/test/graphviz/scanned_medium/graphviz_194.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cd2c8105f383f4996c4249f69e68305be8c012ea
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_194.txt
@@ -0,0 +1,21 @@
+<Consortium Blockchain Setup, connectedTo, Voting Systems on Blockchain>
+<Decentralized Network Design, connectedTo, Public Blockchain Deployment>
+<Decentralized Network Design, identifies users, Enterprise Blockchain Solutions>
+<Enterprise Blockchain Solutions, develops layer_2s, Gaming on Blockchain>
+<Gaming on Blockchain, traces provenance, Supply Chain Traceability>
+<Governance Models for Blockchains, connectedTo, Transaction Verification>
+<Intellectual Property Management, connectedTo, Consortium Blockchain Setup>
+<Intellectual Property Management, connectedTo, Supply Chain Traceability>
+<Intellectual Property Management, tokenizes assets, Enterprise Blockchain Solutions>
+<Oracles Integration, connectedTo, Intellectual Property Management>
+<Public Blockchain Deployment, connectedTo, Real Estate Tokenization>
+<Public Blockchain Deployment, partOf, Public Blockchain Deployment>
+<Real Estate Tokenization, partOf, Real Estate Tokenization>
+<Real Estate Tokenization, supports DeFi, Tokenomics Design>
+<Smart Contract Development, connectedTo, Oracles Integration>
+<Smart Contract Development, connectedTo, Tokenomics Design>
+<Supply Chain Traceability, connectedTo, Governance Models for Blockchains>
+<Tokenomics Design, connectedTo, Oracles Integration>
+<Tokenomics Design, secures health data, Zero_Knowledge Proofs>
+<Voting Systems on Blockchain, connectedTo, Decentralized Network Design>
+<Zero_Knowledge Proofs, connectedTo, Oracles Integration>
diff --git a/test/graphviz/scanned_medium/graphviz_198.dot b/test/graphviz/scanned_medium/graphviz_198.dot
new file mode 100644
index 0000000000000000000000000000000000000000..061a161ea13eca2e4a728a3883e0f4218c287828
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_198.dot
@@ -0,0 +1,51 @@
+digraph {
+	rankdir=BT
+	N0 [label="Cross_chain Swaps" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Interoperability Solutions" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N2 [label="Decentralized Exchange Operation" color="#42A5F5" fillcolor="#F1F8FF" shape=oval style=filled]
+	N3 [label="Blockchain Explorers" color="#42A5F5" fillcolor="#F1F8FF" shape=folder style=filled]
+	N4 [label="Mining Algorithm Design" color="#42A5F5" fillcolor="#F1F8FF" shape=folder style=filled]
+	N5 [label="Coin Creation" color="#FF9800" fillcolor="#FFE0B2" shape=Mdiamond style=filled]
+	N6 [label="Market Analysis" color="#00BCD4" fillcolor="#B2EBF2" shape=octagon style=filled]
+	N7 [label="Token Generation Event" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N8 [label="Community Building" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N9 [label="Custodial Services" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N10 [label="Web3 Integration" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N11 [label=Staking color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N12 [label="Transaction Processing" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Airdrop Campaigns" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Hot Wallet Security" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest0_1 [label="Stablecoin Design" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+		nest0_2 [label="Legal Advisory for Crypto" color="#00BCD4" fillcolor="#B2EBF2" shape=folder style=filled]
+		nest0_3 [label="Tax Reporting for Crypto" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="ensures compliance" color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label="manages TGEs" color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="educates users" color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label="borrows capital" color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [label="develops exchanges" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label="analyzes markets" color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label="custodies assets" color="#FF9800" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_198.txt b/test/graphviz/scanned_medium/graphviz_198.txt
new file mode 100644
index 0000000000000000000000000000000000000000..838cbe83fb3a2803a9d89f51e73eb0a5a789f022
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_198.txt
@@ -0,0 +1,27 @@
+<Blockchain Explorers, connectedTo, Mining Algorithm Design>
+<Coin Creation, analyzes markets, Custodial Services>
+<Coin Creation, connectedTo, Market Analysis>
+<Coin Creation, connectedTo, Token Generation Event>
+<Coin Creation, connectedTo, Web3 Integration>
+<Coin Creation, develops exchanges, Hot Wallet Security>
+<Community Building, connectedTo, Custodial Services>
+<Cross_chain Swaps, connectedTo, Interoperability Solutions>
+<Custodial Services, connectedTo, Web3 Integration>
+<Decentralized Exchange Operation, connectedTo, Blockchain Explorers>
+<Decentralized Exchange Operation, connectedTo, Market Analysis>
+<Decentralized Exchange Operation, connectedTo, Web3 Integration>
+<Decentralized Exchange Operation, custodies assets, Community Building>
+<Hot Wallet Security, connectedTo, Stablecoin Design>
+<Hot Wallet Security, partOf, Hot Wallet Security>
+<Interoperability Solutions, connectedTo, Decentralized Exchange Operation>
+<Legal Advisory for Crypto, manages TGEs, Tax Reporting for Crypto>
+<Legal Advisory for Crypto, partOf, Legal Advisory for Crypto>
+<Market Analysis, connectedTo, Token Generation Event>
+<Mining Algorithm Design, educates users, Coin Creation>
+<Stablecoin Design, ensures compliance, Legal Advisory for Crypto>
+<Stablecoin Design, partOf, Stablecoin Design>
+<Staking, connectedTo, Transaction Processing>
+<Tax Reporting for Crypto, connectedTo, Decentralized Exchange Operation>
+<Tax Reporting for Crypto, partOf, Tax Reporting for Crypto>
+<Token Generation Event, connectedTo, Community Building>
+<Web3 Integration, borrows capital, Staking>
diff --git a/test/graphviz/scanned_medium/graphviz_199.dot b/test/graphviz/scanned_medium/graphviz_199.dot
new file mode 100644
index 0000000000000000000000000000000000000000..edd631867578b2bd3bf3d3d6ebf6f6021fc47072
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_199.dot
@@ -0,0 +1,55 @@
+digraph {
+	rankdir=TD
+	N0 [label="Reward Tier Design" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="Securities Regulations Adherence" color="#4285F4" fillcolor="#D0E0F8" shape=plaintext style=filled]
+	N2 [label="Community Building" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N3 [label="Goal Setting" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N4 [label="Intellectual Property Protection" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N5 [label="Tax Implications of Crowdfunding" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N6 [label="Reward_Based Crowdfunding" color="#4285F4" fillcolor="#D0E0F8" shape=plaintext style=filled]
+	N7 [label="Pitch Deck Preparation" color="#F06292" fillcolor="#FCE4EC" shape=box style=filled]
+	N8 [label="Debt Crowdfunding" color="#4285F4" fillcolor="#D0E0F8" shape=octagon style=filled]
+	N9 [label="Due Diligence for Projects" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N10 [label="Logistics for Rewards" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N11 [label="Customer Support for Backers" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4285F4" fillcolor="#D0E0F8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Donation_Based Crowdfunding" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Press Outreach" color="#4285F4" fillcolor="#D0E0F8" shape=oval style=filled]
+		nest0_1 [label="Backer Communication" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest0_2 [label="Financial Projection Analysis" color="#F06292" fillcolor="#FCE4EC" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="promotes campaigns" color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="handles logistics" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label="sends emails" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label="analyzes data" color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N1 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [label="ensures compliance" color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> S1 [color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [label="adheres to regulations" color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#F06292" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#4285F4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [label="produces content" color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label="performs due diligence" color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [label="develops products" color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N10 [color="#F06292" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_2.dot b/test/graphviz/scanned_medium/graphviz_2.dot
new file mode 100644
index 0000000000000000000000000000000000000000..bb12b044c4fa067071f5e79fb4435c1c78a4454d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_2.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=BT
+	N0 [label="Anesthesia Administration" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Case Review" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N2 [label="Epidemiological Tracking" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N3 [label="Pain Management" color="#795548" fillcolor="#D7CCC8" shape=Mdiamond style=filled]
+	N4 [label=Surgery color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N5 [label="Home Care Visit" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N6 [label="Wound Care" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N7 [label="Physical Examination" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+	N8 [label="Genetic Counseling" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N9 [label=Discharge color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N10 [label="Dental Check_up" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N11 [label="Pharmacy Order" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N0 -> N1 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=assesses color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=prevents color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=prescribes color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=implements color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=researches color="#795548" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N11 -> N0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N10 -> N6 [label=coordinates color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_2.txt b/test/graphviz/scanned_medium/graphviz_2.txt
new file mode 100644
index 0000000000000000000000000000000000000000..81ac61d8f5315034df9ca12df7b279dfc03364d9
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_2.txt
@@ -0,0 +1,13 @@
+<Anesthesia Administration, connectedTo, Case Review>
+<Case Review, connectedTo, Epidemiological Tracking>
+<Dental Check_up, connectedTo, Pharmacy Order>
+<Dental Check_up, coordinates, Wound Care>
+<Discharge, researches, Dental Check_up>
+<Epidemiological Tracking, connectedTo, Pain Management>
+<Genetic Counseling, implements, Discharge>
+<Home Care Visit, connectedTo, Wound Care>
+<Pain Management, connectedTo, Surgery>
+<Pharmacy Order, connectedTo, Anesthesia Administration>
+<Physical Examination, prescribes, Genetic Counseling>
+<Surgery, assesses, Home Care Visit>
+<Wound Care, prevents, Physical Examination>
diff --git a/test/graphviz/scanned_medium/graphviz_200.dot b/test/graphviz/scanned_medium/graphviz_200.dot
new file mode 100644
index 0000000000000000000000000000000000000000..01c4714733eb2d2200a63e529bf662b9af973c0b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_200.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=LR
+	N0 [label="Due Diligence for Projects" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N1 [label="Real Estate Crowdfunding" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N2 [label="Marketing Strategy" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N3 [label="Donation_Based Crowdfunding" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+	N4 [label="Reward Tier Design" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N5 [label="Manufacturing Planning" color="#BDAFA8" fillcolor="#E4E0DF" shape=octagon style=filled]
+	N6 [label="Escrow Management" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N7 [label="Post_Campaign Reporting" color="#CFCFCF" fillcolor="#F6F6F6" shape=Mdiamond style=filled]
+	N8 [label="Investor Relations" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S1 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Logistics for Rewards" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Investor Verification" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+		nest0_1 [label="Debt Crowdfunding" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="manages fees" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="protects IP" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [label="develops products" color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N1 [label="conducts outreach" color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N2 -> S1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#CFCFCF" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#CFCFCF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label="sends emails" color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_201.dot b/test/graphviz/scanned_medium/graphviz_201.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4d1b6c3ea6b3b9d70cf60692bae279b3af939fbe
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_201.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=RL
+	N0 [label="Financial Projection Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Reward Tier Design" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+	N2 [label="Debt Crowdfunding" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N3 [label="Pitch Deck Preparation" color="#9575CD" fillcolor="#EDE7F6" shape=diamond style=filled]
+	N4 [label="Equity Crowdfunding" color="#FFF9AE" fillcolor="#FFFCE6" shape=diamond style=filled]
+	N5 [label="Project Vetting" color="#DCE775" fillcolor="#FCFCE7" shape=octagon style=filled]
+	N6 [label="Real Estate Crowdfunding" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	S0 [label="" color="#9575CD" fillcolor="#EDE7F6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Backer Communication" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Video Production for Campaigns" color="#FFF9AE" fillcolor="#FFFCE6" shape=hexagon style=filled]
+		nest0_1 [label="Post_Campaign Reporting" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_2 [label="Tax Implications of Crowdfunding" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+		nest0_3 [label="Goal Setting" color="#DCE775" fillcolor="#FCFCE7" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [label="attracts investors" color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="manages debt" color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label="verifies identities" color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="develops products" color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#9575CD" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_204.dot b/test/graphviz/scanned_medium/graphviz_204.dot
new file mode 100644
index 0000000000000000000000000000000000000000..02a6fc6e4cce97353e2ed1ec18b026098c122cd2
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_204.dot
@@ -0,0 +1,54 @@
+digraph {
+	rankdir=LR
+	N0 [label="Smart Home Devices" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Device Prototyping" color="#C2B2F0" fillcolor="#EFE6FF" shape=octagon style=filled]
+	N2 [label="Data Privacy in IoT" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N3 [label="Smart City Sensors" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N4 [label="Healthcare IoT Devices" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N5 [label="Asset Tracking" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N6 [label="Remote Monitoring and Control" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N7 [label="Sensor Integration" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N8 [label="Wearable Technology" color="#C2B2F0" fillcolor="#EFE6FF" shape=folder style=filled]
+	N9 [label="Data Analysis in Cloud" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N10 [label="Cloud Platform Integration" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N11 [label="Edge Computing for IoT" color="#5C6BC0" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N12 [label="Security Implementation" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Smart Manufacturing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Power Management for Devices" color="#C2B2F0" fillcolor="#EFE6FF" shape=octagon style=filled]
+		nest0_1 [label="Over_the_Air Updates" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_2 [label="User Interface for IoT Apps" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+		nest0_3 [label="Energy Management Systems" color="#4CAF50" fillcolor="#C8E6C9" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="optimizes industrial processes" color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="updates firmware" color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label="controls devices" color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [label="collects data" color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label="improves retail" color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_205.dot b/test/graphviz/scanned_medium/graphviz_205.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0da6d1bff1bf3a345d43f759a6c88c5c6751f334
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_205.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=TD
+	N0 [label="Containerization at Edge" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N1 [label="Compliance and Governance at Edge" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N2 [label="Event_Driven Architectures at Edge" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N3 [label="Resource Management at Edge" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N4 [label="Edge AI Model Deployment" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N5 [label="Edge Gateway Management" color="#FFF176" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N6 [label="Connectivity to Cloud" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N7 [label="Fault Tolerance at Edge" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	S0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Latency Reduction" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fleet Management for Edge Devices" color="#FFF176" fillcolor="#FFFDE7" shape=parallelogram style=filled]
+		nest0_1 [label="Bandwidth Optimization" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+		nest0_2 [label="Data Filtering at Edge" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+		nest0_3 [label="Real_time Analytics at Edge" color="#90A4AE" fillcolor="#ECEFF1" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="processes data locally" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="synchronizes data" color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="optimizes telecoms" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [label="supports industrial IoT" color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [label="performs real_time analytics" color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N7 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_206.dot b/test/graphviz/scanned_medium/graphviz_206.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9684d6a46413c6aec5fee5baa75c98acd45adef6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_206.dot
@@ -0,0 +1,39 @@
+digraph {
+	rankdir=BT
+	N0 [label="Data Synchronization between Edge and Cloud" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label="Compliance and Governance at Edge" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+	N2 [label="Fault Tolerance at Edge" color="#80DDEA" fillcolor="#D3F7F9" shape=folder style=filled]
+	N3 [label="Data Filtering at Edge" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N4 [label="Real_time Analytics at Edge" color="#80DDEA" fillcolor="#D3F7F9" shape=diamond style=filled]
+	N5 [label="Edge API Management" color="#388E3C" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N6 [label="Edge Computing Hardware Selection" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N7 [label="Bandwidth Optimization" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N8 [label="Orchestration of Edge Workloads" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N9 [label="Power Consumption Optimization" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Industrial Edge Computing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Fleet Management for Edge Devices" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+		nest0_1 [label="Edge Application Development" color="#FFDA4E" fillcolor="#FFE88D" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label="analyzes data at edge" color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="deploys nodes" color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [label="manages power consumption" color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N5 [label="ensures compliance" color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [label="transfers data efficiently" color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_208.txt b/test/graphviz/scanned_medium/graphviz_208.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c584d1a27f973c87314912b23bc8676264725369
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_208.txt
@@ -0,0 +1,17 @@
+<Cloud Audit Trails, connectedTo, Cloud Backup Solutions>
+<Cloud Firewall Configuration, connectedTo, Cloud_based VPN Setup>
+<Cloud Firewall Configuration, connectedTo, Cost Optimization in Cloud>
+<Cloud Firewall Configuration, provides APIs, Platform as a Service>
+<Cloud_based VPN Setup, connectedTo, Cloud Audit Trails>
+<Cloud_based VPN Setup, connectedTo, Cost Optimization in Cloud>
+<Cost Optimization in Cloud, builds hybrid clouds, Infrastructure as a Service>
+<Cost Optimization in Cloud, partOf, Cost Optimization in Cloud>
+<Database as a Service, connectedTo, Cloud_based VPN Setup>
+<DevOps on Cloud, connectedTo, Cloud Audit Trails>
+<DevOps on Cloud, partOf, DevOps on Cloud>
+<Infrastructure as a Service, connectedTo, Database as a Service>
+<Infrastructure as a Service, connectedTo, DevOps on Cloud>
+<Infrastructure as a Service, partOf, Infrastructure as a Service>
+<Platform as a Service, connectedTo, Cloud_based VPN Setup>
+<Platform as a Service, connectedTo, Database as a Service>
+<Platform as a Service, enables autoscaling, Cost Optimization in Cloud>
diff --git a/test/graphviz/scanned_medium/graphviz_209.txt b/test/graphviz/scanned_medium/graphviz_209.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aa18bf87aa1012ac143c9062995528f752eb950b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_209.txt
@@ -0,0 +1,21 @@
+<API Management in Cloud, connectedTo, DevOps on Cloud>
+<API Management in Cloud, partOf, API Management in Cloud>
+<Big Data Services in Cloud, connectedTo, Private Cloud Management>
+<Big Data Services in Cloud, partOf, Big Data Services in Cloud>
+<Cloud Architecture Design, integrates edge, Cloud Governance>
+<Cloud Governance, connectedTo, Virtual Machine Management>
+<DevOps on Cloud, audits usage, Big Data Services in Cloud>
+<DevOps on Cloud, partOf, DevOps on Cloud>
+<Identity and Access Management, connectedTo, Cloud Governance>
+<Identity and Access Management, connectedTo, Platform as a Service>
+<Identity and Access Management, connectedTo, Private Cloud Management>
+<Platform as a Service, automates tasks, Cloud Governance>
+<Platform as a Service, connectedTo, Cloud Governance>
+<Platform as a Service, connectedTo, Private Cloud Management>
+<Platform as a Service, connectedTo, Virtual Machine Management>
+<Private Cloud Management, connectedTo, API Management in Cloud>
+<Private Cloud Management, connectedTo, Cloud Architecture Design>
+<Private Cloud Management, connectedTo, Virtual Machine Management>
+<Serverless Computing, connectedTo, Identity and Access Management>
+<Serverless Computing, connectedTo, Virtual Machine Management>
+<Virtual Machine Management, migrates workloads, Cloud Native Application Development>
diff --git a/test/graphviz/scanned_medium/graphviz_21.dot b/test/graphviz/scanned_medium/graphviz_21.dot
new file mode 100644
index 0000000000000000000000000000000000000000..124bd3506576a9ba795806dc548ec46348d499cd
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_21.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=LR
+	N0 [label="Actuarial Analysis" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N1 [label="Agent Training" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N2 [label="Healthcare Provider Network Management" color="#7E57C2" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N3 [label="Compliance Reporting" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N4 [label="Policy Cancellation" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Property Damage Assessment" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N6 [label="Digital Policy Management" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N7 [label=Subrogation color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Policy Application" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N9 [label="Benefit Payout" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+	N10 [label="Policy Renewal" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N0 -> N1 [label=secures color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=prevents color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=distributes color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=cancels color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=quotes color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=mitigates color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N9 [label=manages color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_211.txt b/test/graphviz/scanned_medium/graphviz_211.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ecc89240721eb2e84dd676dabc5224fef975bfec
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_211.txt
@@ -0,0 +1,24 @@
+<Access Control Systems, connectedTo, System Administration>
+<Cloud Integration with On_premise, connectedTo, Group Policy Management>
+<Cloud Integration with On_premise, connectedTo, Storage Solutions>
+<Cloud Integration with On_premise, connectedTo, System Administration>
+<Data Center Management, configures firewalls, Access Control Systems>
+<Data Center Management, connectedTo, System Administration>
+<Data Center Management, manages access controls, Group Policy Management>
+<Disaster Recovery Planning, connectedTo, Operating System Installation>
+<Disaster Recovery Planning, manages remote access, Data Center Management>
+<Group Policy Management, connectedTo, Operating System Installation>
+<Operating System Installation, troubleshoots issues, Server Deployment>
+<Remote Access Solutions, manages users, Virtual Desktop Infrastructure>
+<Remote Access Solutions, partOf, Remote Access Solutions>
+<Server Deployment, connectedTo, Access Control Systems>
+<Software Licensing Management, administers databases, Storage Solutions>
+<Software Licensing Management, connectedTo, Operating System Installation>
+<Software Licensing Management, connectedTo, Troubleshooting and Support>
+<Storage Solutions, connectedTo, Disaster Recovery Planning>
+<Storage Solutions, connectedTo, Remote Access Solutions>
+<System Administration, connectedTo, Network Security>
+<Troubleshooting and Support, automates tasks, Storage Solutions>
+<Troubleshooting and Support, tracks assets, Cloud Integration with On_premise>
+<Virtual Desktop Infrastructure, partOf, Virtual Desktop Infrastructure>
+<Virtual Desktop Infrastructure, performs backups, Group Policy Management>
diff --git a/test/graphviz/scanned_medium/graphviz_212.txt b/test/graphviz/scanned_medium/graphviz_212.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3cf6cb9c7937702cd3e00eb47059d0b1cfab81dc
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_212.txt
@@ -0,0 +1,22 @@
+<Automation Scripting, connectedTo, Network Security>
+<Automation Scripting, connectedTo, Troubleshooting and Support>
+<Backup and Recovery Systems, connectedTo, Environmental Monitoring>
+<Backup and Recovery Systems, partOf, Backup and Recovery Systems>
+<Capacity Planning, connectedTo, Operating System Installation>
+<Environmental Monitoring, deploys antiviruses, Software Licensing Management>
+<Environmental Monitoring, partOf, Environmental Monitoring>
+<Firewall Management, connectedTo, Backup and Recovery Systems>
+<Firewall Management, connectedTo, Troubleshooting and Support>
+<Group Policy Management, connectedTo, Capacity Planning>
+<Group Policy Management, connectedTo, Operating System Installation>
+<Group Policy Management, monitors performance, Power and Cooling Management>
+<Network Security, connectedTo, Firewall Management>
+<Network Security, connectedTo, Group Policy Management>
+<Network Security, connectedTo, Troubleshooting and Support>
+<Network Security, monitors performance, Power and Cooling Management>
+<Power and Cooling Management, connectedTo, Capacity Planning>
+<Server Deployment, connectedTo, Group Policy Management>
+<Server Deployment, partOf, Server Deployment>
+<Software Licensing Management, connectedTo, Server Deployment>
+<Software Licensing Management, partOf, Software Licensing Management>
+<Troubleshooting and Support, connectedTo, Group Policy Management>
diff --git a/test/graphviz/scanned_medium/graphviz_213.dot b/test/graphviz/scanned_medium/graphviz_213.dot
new file mode 100644
index 0000000000000000000000000000000000000000..62d27920fa36d3f4e083f06a490b380e07e37573
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_213.dot
@@ -0,0 +1,53 @@
+digraph {
+	rankdir=BT
+	N0 [label="Load Balancer Setup" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N1 [label="Hardware Procurement" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N2 [label="Web Server Configuration" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N3 [label="Software Licensing Management" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N4 [label="Server Deployment" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N5 [label="System Administration" color="#FFCC80" fillcolor="#FFF0CC" shape=parallelogram style=filled]
+	N6 [label="Access Control Systems" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N7 [label="Group Policy Management" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N8 [label="Backup and Recovery Systems" color="#FFCC80" fillcolor="#FFF0CC" shape=octagon style=filled]
+	N9 [label="Monitoring and Alerting" color="#2196F3" fillcolor="#BBDEFB" shape=plaintext style=filled]
+	N10 [label="Power and Cooling Management" color="#A188D0" fillcolor="#DACBE3" shape=hexagon style=filled]
+	N11 [label="Disaster Recovery Planning" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N12 [label="Data Center Management" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188D0" fillcolor="#DACBE3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Network Security" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Database Administration" color="#FFCC80" fillcolor="#FFF0CC" shape=folder style=filled]
+		nest0_1 [label="Virtual Desktop Infrastructure" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+		nest0_2 [label="Network Design" color="#2196F3" fillcolor="#BBDEFB" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [label="manages proxies" color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="manages licenses" color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="deploys VDIs" color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label="sets up DNS" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="plans capacity" color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [label="monitors performance" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [label="deploys antiviruses" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [label="performs backups" color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	M1 -> N11 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_215.dot b/test/graphviz/scanned_medium/graphviz_215.dot
new file mode 100644
index 0000000000000000000000000000000000000000..187e41b759d1282c97f0a3d2ae76c2d6415bd466
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_215.dot
@@ -0,0 +1,50 @@
+digraph {
+	rankdir=TD
+	N0 [label="Blue_Green Deployments" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Collaboration Tools" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+	N2 [label="Canary Releases" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N3 [label="Infrastructure Provisioning" color="#795548" fillcolor="#D7CCC8" shape=diamond style=filled]
+	N4 [label="Microservices Architecture" color="#FFA726" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N5 [label="Cross_Functional Team Collaboration" color="#795548" fillcolor="#D7CCC8" shape=plaintext style=filled]
+	N6 [label="Feedback Loops" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N7 [label=ChatOps color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N8 [label="Secrets Management" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+	N9 [label="Performance Metrics Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N10 [label="Pipeline Automation" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+	N11 [label="Alerting and Incident Response" color="#BCB88A" fillcolor="#F5F5DC" shape=hexagon style=filled]
+	N12 [label="Continuous Delivery" color="#795548" fillcolor="#D7CCC8" shape=octagon style=filled]
+	N13 [label="Release Management" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label=Containerization labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Security in DevOps" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+		nest0_1 [label="Container Orchestration" color="#795548" fillcolor="#D7CCC8" shape=plaintext style=filled]
+		nest0_2 [label="Site Reliability Engineering Principles" color="#BCB88A" fillcolor="#F5F5DC" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label="collects metrics" color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label="builds cloud_native apps" color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="uses serverless" color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="automates pipelines" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="orchestrates containers" color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label="manages feature flags" color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label="manages versions" color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [label="secures secrets" color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [label="deploys releases" color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N5 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_215.txt b/test/graphviz/scanned_medium/graphviz_215.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6c3ac74b3ed8804d6799bde3b77a391ce1322e67
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_215.txt
@@ -0,0 +1,25 @@
+<Alerting and Incident Response, manages versions, Continuous Delivery>
+<Blue_Green Deployments, builds cloud_native apps, Collaboration Tools>
+<Canary Releases, connectedTo, Cross_Functional Team Collaboration>
+<Canary Releases, connectedTo, Infrastructure Provisioning>
+<Canary Releases, secures secrets, Security in DevOps>
+<ChatOps, automates pipelines, Secrets Management>
+<ChatOps, connectedTo, Alerting and Incident Response>
+<ChatOps, deploys releases, Pipeline Automation>
+<Collaboration Tools, connectedTo, Canary Releases>
+<Container Orchestration, collects metrics, Site Reliability Engineering Principles>
+<Container Orchestration, partOf, Container Orchestration>
+<Continuous Delivery, connectedTo, Release Management>
+<Cross_Functional Team Collaboration, uses serverless, Feedback Loops>
+<Feedback Loops, connectedTo, ChatOps>
+<Infrastructure Provisioning, connectedTo, Microservices Architecture>
+<Microservices Architecture, connectedTo, Cross_Functional Team Collaboration>
+<Performance Metrics Analysis, connectedTo, Alerting and Incident Response>
+<Performance Metrics Analysis, connectedTo, Release Management>
+<Performance Metrics Analysis, manages feature flags, Pipeline Automation>
+<Pipeline Automation, connectedTo, Alerting and Incident Response>
+<Secrets Management, orchestrates containers, Performance Metrics Analysis>
+<Security in DevOps, connectedTo, Container Orchestration>
+<Security in DevOps, partOf, Security in DevOps>
+<Site Reliability Engineering Principles, connectedTo, Continuous Delivery>
+<Site Reliability Engineering Principles, partOf, Site Reliability Engineering Principles>
diff --git a/test/graphviz/scanned_medium/graphviz_216.dot b/test/graphviz/scanned_medium/graphviz_216.dot
new file mode 100644
index 0000000000000000000000000000000000000000..24471f8d4701245dfefc91da52e57c229d28e214
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_216.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=RL
+	N0 [label="Automated Rollbacks" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N1 [label="Static Code Analysis" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N2 [label="Infrastructure as Code" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N3 [label="Feedback Loops" color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+	N4 [label="Code Quality Checks" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N5 [label="Site Reliability Engineering Principles" color="#C2B2F0" fillcolor="#EFE6FF" shape=octagon style=filled]
+	N6 [label="Release Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=parallelogram style=filled]
+	N7 [label="Post_Mortem Analysis" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N8 [label="Microservices Architecture" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N9 [label="Continuous Integration" color="#C2B2F0" fillcolor="#EFE6FF" shape=hexagon style=filled]
+	N10 [label="Continuous Delivery" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	S0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Cross_Functional Team Collaboration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=GitOps color="#A2D0FF" fillcolor="#E8F0FF" shape=plaintext style=filled]
+		nest0_1 [label="Serverless Deployment" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_2 [label="Infrastructure Provisioning" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_3 [label="Dynamic Application Security Testing" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label="automates operations" color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="uses GitOps" color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="sends alerts" color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="practices chaos engineering" color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="provisions infrastructure" color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label="implements SRE" color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_216.txt b/test/graphviz/scanned_medium/graphviz_216.txt
new file mode 100644
index 0000000000000000000000000000000000000000..742b2378f15032894b1997a3e3c40e54ffd5ce9a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_216.txt
@@ -0,0 +1,23 @@
+<Automated Rollbacks, implements SRE, Feedback Loops>
+<Automated Rollbacks, sends alerts, Static Code Analysis>
+<Code Quality Checks, provisions infrastructure, Site Reliability Engineering Principles>
+<Continuous Integration, connectedTo, Continuous Delivery>
+<Dynamic Application Security Testing, connectedTo, Static Code Analysis>
+<Dynamic Application Security Testing, partOf, Dynamic Application Security Testing>
+<Feedback Loops, connectedTo, Code Quality Checks>
+<GitOps, automates operations, Serverless Deployment>
+<GitOps, partOf, GitOps>
+<Infrastructure Provisioning, connectedTo, Dynamic Application Security Testing>
+<Infrastructure Provisioning, partOf, Infrastructure Provisioning>
+<Infrastructure as Code, practices chaos engineering, Feedback Loops>
+<Microservices Architecture, connectedTo, Continuous Integration>
+<Post_Mortem Analysis, connectedTo, Microservices Architecture>
+<Release Management, connectedTo, Post_Mortem Analysis>
+<Serverless Deployment, partOf, Serverless Deployment>
+<Serverless Deployment, uses GitOps, Infrastructure Provisioning>
+<Site Reliability Engineering Principles, connectedTo, Continuous Integration>
+<Site Reliability Engineering Principles, connectedTo, GitOps>
+<Site Reliability Engineering Principles, connectedTo, Post_Mortem Analysis>
+<Site Reliability Engineering Principles, connectedTo, Release Management>
+<Static Code Analysis, connectedTo, Feedback Loops>
+<Static Code Analysis, connectedTo, Infrastructure as Code>
diff --git a/test/graphviz/scanned_medium/graphviz_217.txt b/test/graphviz/scanned_medium/graphviz_217.txt
new file mode 100644
index 0000000000000000000000000000000000000000..35beec5159a0d03892646bfb0e9540a7bff6e28b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_217.txt
@@ -0,0 +1,24 @@
+<Algorithm Design, connectedTo, Containerization>
+<Algorithm Design, connectedTo, Web Application Development>
+<Architecture Planning, connectedTo, Mobile Application Development>
+<Backend Development, connectedTo, Web Application Development>
+<Backend Development, partOf, Backend Development>
+<Coding, connectedTo, Desktop Application Development>
+<Coding, connectedTo, Microservices Architecture>
+<Coding, connectedTo, Web Application Development>
+<Coding, develops cloud_native apps, Game Development>
+<Coding, writes unit tests, Mobile Application Development>
+<Containerization, connectedTo, Coding>
+<Containerization, connectedTo, Web Application Development>
+<Database Design, connectedTo, Performance Optimization>
+<Database Design, partOf, Database Design>
+<Desktop Application Development, connectedTo, Game Development>
+<Microservices Architecture, connectedTo, Web Application Development>
+<Mobile Application Development, connectedTo, Desktop Application Development>
+<Mobile Application Development, develops frontends, Database Design>
+<Performance Optimization, designs algorithms, Backend Development>
+<Performance Optimization, partOf, Performance Optimization>
+<Web Application Development, connectedTo, Architecture Planning>
+<Web Application Development, connectedTo, Desktop Application Development>
+<Web Application Development, connectedTo, Game Development>
+<Web Application Development, uses agile methodologies, Mobile Application Development>
diff --git a/test/graphviz/scanned_medium/graphviz_218.dot b/test/graphviz/scanned_medium/graphviz_218.dot
new file mode 100644
index 0000000000000000000000000000000000000000..baede4d43915c147e3f84f2ef2e66ef0a09daed5
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_218.dot
@@ -0,0 +1,49 @@
+digraph {
+	rankdir=LR
+	N0 [label="Algorithm Design" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Game Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=plaintext style=filled]
+	N2 [label=Coding color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N3 [label="Technical Debt Management" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N4 [label="Compiler Design" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N5 [label="User Interface Design" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N6 [label="Continuous Delivery" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N7 [label=Containerization color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N8 [label="Desktop Application Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N9 [label="Security Hardening" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#BDAFA8" fillcolor="#E4E0DF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label=Deployment labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Code Review" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+		nest0_1 [label="Scalability Design" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest0_2 [label="Frontend Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=parallelogram style=filled]
+		nest0_3 [label="Bug Fixing" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label="builds desktop apps" color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="designs APIs" color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="uses containers" color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="ensures scalability" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="builds microservices" color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest0_0 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [label="deploys applications" color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_219.dot b/test/graphviz/scanned_medium/graphviz_219.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b76f0b6c3fa8d2ac8ac2f4c2bac9d5fc993c03d1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_219.dot
@@ -0,0 +1,53 @@
+digraph {
+	rankdir=BT
+	N0 [label="Version Control" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Compiler Design" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+	N2 [label="User Experience Design" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N3 [label="Agile Methodologies" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N4 [label="Scalability Design" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+	N5 [label="Operating System Development" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N6 [label="System Design" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N7 [label="Frontend Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N8 [label="Backend Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N9 [label=Documentation color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N10 [label=Deployment color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+	N11 [label="Technical Debt Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N12 [label="System Testing" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	S0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7986CB" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FF9800" fillcolor="#FFE0B2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label=Coding labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="User Interface Design" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+		nest0_1 [label="Bug Fixing" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label="deploys applications" color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="develops cloud_native apps" color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="writes documentation" color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label="architects systems" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N7 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_220.dot b/test/graphviz/scanned_medium/graphviz_220.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2c9211c3d4ff8f5695fe531f0ee872e137e82fdc
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_220.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=TD
+	N0 [label="Troubleshooting and Debugging" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Microcontroller Programming" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N2 [label="Mechanical Design Integration" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N3 [label="Mixed_Signal Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N4 [label="Environmental Testing" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+	N5 [label="FPGA Design" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N6 [label="Circuit Design" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N7 [label="Supply Chain Management for Components" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N8 [label="High_Speed Digital Design" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N9 [label="Power Management Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+	N10 [label="Quality Control" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Cable Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Component Selection" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+		nest0_1 [label="ASIC Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=parallelogram style=filled]
+		nest0_2 [label="Test Fixture Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+		nest0_3 [label="Enclosure Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [label="ensures compliance" color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="designs mechanicals" color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="troubleshoots issues" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="manages supply chains" color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="programs microcontrollers" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [label="analyzes signals" color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label="integrates sensors" color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_221.txt b/test/graphviz/scanned_medium/graphviz_221.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ddbeee094fe73dcf811bbf819a9fa8cd38c2770f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_221.txt
@@ -0,0 +1,17 @@
+<Component Selection, creates schematics, Material Selection>
+<Documentation, connectedTo, Sensor Integration>
+<Documentation, partOf, Documentation>
+<Enclosure Design, connectedTo, Component Selection>
+<Enclosure Design, connectedTo, Material Selection>
+<Enclosure Design, connectedTo, Quality Control>
+<Enclosure Design, connectedTo, Sensor Integration>
+<High_Speed Digital Design, builds prototypes, Quality Control>
+<High_Speed Digital Design, connectedTo, Testing and Validation>
+<High_Speed Digital Design, develops firmware, Enclosure Design>
+<Prototyping, connectedTo, Documentation>
+<Prototyping, partOf, Prototyping>
+<Quality Control, connectedTo, Sensor Integration>
+<Sensor Integration, connectedTo, Component Selection>
+<Testing and Validation, connectedTo, Enclosure Design>
+<Testing and Validation, connectedTo, Sensor Integration>
+<Testing and Validation, optimizes power delivery, Prototyping>
diff --git a/test/graphviz/scanned_medium/graphviz_222.dot b/test/graphviz/scanned_medium/graphviz_222.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0e52770a9ef2e2a6e0ef01f5e7831e48db4f7fbd
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_222.dot
@@ -0,0 +1,55 @@
+digraph {
+	rankdir=RL
+	N0 [label="Reliability Testing" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Actuator Control" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N2 [label="Failure Analysis" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N3 [label="RF Circuit Design" color="#FFC2C2" fillcolor="#FFEBEB" shape=Mdiamond style=filled]
+	N4 [label="Environmental Testing" color="#FFC2C2" fillcolor="#FFEBEB" shape=Mdiamond style=filled]
+	N5 [label="PCB Layout" color="#A188D0" fillcolor="#DACBE3" shape=box style=filled]
+	N6 [label="Troubleshooting and Debugging" color="#FFC2C2" fillcolor="#FFEBEB" shape=hexagon style=filled]
+	N7 [label="Test Fixture Design" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N8 [label="Signal Integrity Analysis" color="#A188D0" fillcolor="#DACBE3" shape=ellipse style=filled]
+	N9 [label="Regulatory Compliance" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N10 [label="Microcontroller Programming" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N11 [label=Prototyping color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N12 [label="Mechanical Design Integration" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N13 [label="Cable Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N14 [label="FPGA Design" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Optical Module Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Cost Optimization" color="#5C6BC0" fillcolor="#E8EAF6" shape=folder style=filled]
+		nest0_1 [label="Reverse Engineering" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="programs microcontrollers" color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="designs mechanicals" color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="designs fixtures" color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="designs optical systems" color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label="lays out PCBs" color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [label="analyzes thermals" color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [label="analyzes failures" color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#A188D0" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [label="manages supply chains" color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [label="controls actuators" color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#A188D0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_222.txt b/test/graphviz/scanned_medium/graphviz_222.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f9d29bb86681726cb498e696baabacf20cd91ddf
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_222.txt
@@ -0,0 +1,27 @@
+<Actuator Control, analyzes failures, Prototyping>
+<Actuator Control, connectedTo, Regulatory Compliance>
+<Actuator Control, programs microcontrollers, Failure Analysis>
+<Cable Management, connectedTo, FPGA Design>
+<Cost Optimization, connectedTo, Reverse Engineering>
+<Cost Optimization, partOf, Cost Optimization>
+<Environmental Testing, connectedTo, PCB Layout>
+<Failure Analysis, analyzes thermals, Microcontroller Programming>
+<Failure Analysis, connectedTo, Environmental Testing>
+<Failure Analysis, connectedTo, Regulatory Compliance>
+<Failure Analysis, connectedTo, Test Fixture Design>
+<Failure Analysis, designs mechanicals, RF Circuit Design>
+<Mechanical Design Integration, connectedTo, Cable Management>
+<Microcontroller Programming, connectedTo, Cost Optimization>
+<Microcontroller Programming, lays out PCBs, Prototyping>
+<PCB Layout, connectedTo, Troubleshooting and Debugging>
+<Prototyping, connectedTo, Mechanical Design Integration>
+<RF Circuit Design, controls actuators, Test Fixture Design>
+<RF Circuit Design, designs fixtures, Environmental Testing>
+<Regulatory Compliance, connectedTo, Microcontroller Programming>
+<Reliability Testing, connectedTo, Actuator Control>
+<Reliability Testing, manages supply chains, Test Fixture Design>
+<Reverse Engineering, connectedTo, Signal Integrity Analysis>
+<Reverse Engineering, partOf, Reverse Engineering>
+<Signal Integrity Analysis, designs optical systems, Regulatory Compliance>
+<Test Fixture Design, connectedTo, Signal Integrity Analysis>
+<Troubleshooting and Debugging, connectedTo, Test Fixture Design>
diff --git a/test/graphviz/scanned_medium/graphviz_223.txt b/test/graphviz/scanned_medium/graphviz_223.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f301eabe49068b9c49a7bd04ef2e70eeae5511ce
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_223.txt
@@ -0,0 +1,22 @@
+<App Store Optimization, connectedTo, Geolocation Services>
+<App Store Optimization, connectedTo, In_App Purchase Integration>
+<App Store Optimization, connectedTo, Security Implementation>
+<App Store Optimization, connectedTo, Updates and Maintenance>
+<App Store Optimization, connectedTo, User Feedback Collection>
+<App Store Optimization, connectedTo, Wireframing>
+<Backend Integration, connectedTo, Updates and Maintenance>
+<Camera Integration, integrates chat, App Store Optimization>
+<Camera Integration, partOf, Camera Integration>
+<Database Design for Mobile, connectedTo, Camera Integration>
+<Database Design for Mobile, partOf, Database Design for Mobile>
+<Gamification Elements, connectedTo, Push Notification Implementation>
+<In_App Purchase Integration, connectedTo, Wireframing>
+<Native App Development, connectedTo, Database Design for Mobile>
+<Native App Development, partOf, Native App Development>
+<Push Notification Implementation, manages databases, App Store Optimization>
+<Real_time Communication Features, connectedTo, Gamification Elements>
+<Security Implementation, monitors crashes, In_App Purchase Integration>
+<Updates and Maintenance, optimizes performance, Geolocation Services>
+<User Feedback Collection, partOf, User Feedback Collection>
+<User Feedback Collection, uses geolocation, Native App Development>
+<Wireframing, connectedTo, Backend Integration>
diff --git a/test/graphviz/scanned_medium/graphviz_225.dot b/test/graphviz/scanned_medium/graphviz_225.dot
new file mode 100644
index 0000000000000000000000000000000000000000..482355e93d5a6da82b607923172f9de50f4ba22a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_225.dot
@@ -0,0 +1,33 @@
+digraph {
+	rankdir=LR
+	N0 [label="In_App Purchase Integration" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N1 [label="API Development" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N2 [label="Concept Development" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N3 [label="Deep Linking" color="#FFF8A6" fillcolor="#FFFDE0" shape=octagon style=filled]
+	N4 [label="IoT Device Control via App" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N5 [label="Geolocation Services" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Native App Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Database Design for Mobile" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+		nest0_1 [label="Updates and Maintenance" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_2 [label="Offline Mode Development" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+		nest0_3 [label="App Store Optimization" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="designs UXs" color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="enables real_time features" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [label="develops cross_platform apps" color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_226.txt b/test/graphviz/scanned_medium/graphviz_226.txt
new file mode 100644
index 0000000000000000000000000000000000000000..22952bb2af5d5e99ae2adb17e575accd0239314a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_226.txt
@@ -0,0 +1,20 @@
+<Campaign Management, connectedTo, Live Streaming on Social Media>
+<Competitor Analysis, connectedTo, Platform Algorithm Understanding>
+<Content Creation, manages messages, Customer Service on Social Media>
+<Content Creation, partOf, Content Creation>
+<Customer Service on Social Media, connectedTo, Live Streaming on Social Media>
+<Customer Service on Social Media, partOf, Customer Service on Social Media>
+<Engagement Rate Calculation, connectedTo, Influencer Collaboration>
+<Engagement Rate Calculation, connectedTo, User_Generated Content Curation>
+<Follower Growth Monitoring, builds groups, User_Generated Content Curation>
+<Follower Growth Monitoring, tracks performance, Engagement Rate Calculation>
+<Influencer Collaboration, connectedTo, User_Generated Content Curation>
+<Platform Algorithm Understanding, connectedTo, Campaign Management>
+<Platform Selection, connectedTo, Content Creation>
+<Platform Selection, partOf, Platform Selection>
+<Reputation Management, connectedTo, Social Listening>
+<Social Listening, connectedTo, Platform Algorithm Understanding>
+<Social Listening, develops crisis plans, Competitor Analysis>
+<Social Listening, manages crises, Live Streaming on Social Media>
+<User_Generated Content Curation, conducts social audits, Platform Selection>
+<User_Generated Content Curation, connectedTo, Reputation Management>
diff --git a/test/graphviz/scanned_medium/graphviz_227.dot b/test/graphviz/scanned_medium/graphviz_227.dot
new file mode 100644
index 0000000000000000000000000000000000000000..226df4e7682da41ae44cbae69255dc08962d8bb5
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_227.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=BT
+	N0 [label="Competitor Analysis" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Crisis Management" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N2 [label="Community Management" color="#61CAC3" fillcolor="#C2E8E6" shape=octagon style=filled]
+	N3 [label="Social Selling" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N4 [label="Paid Social Media Advertising" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N5 [label="Crisis Communication Plan" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N6 [label="Platform Selection" color="#388E3C" fillcolor="#C8E6C9" shape=box style=filled]
+	N7 [label="Audience Engagement" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N8 [label="Scheduling Posts" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N9 [label="Emerging Platform Exploration" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+	N10 [label="Trend Monitoring" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Reels or Short Video Production" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="User_Generated Content Curation" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+		nest0_1 [label="Personal Branding on Social Media" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_2 [label="Content Strategy" color="#FFA726" fillcolor="#FFF3E0" shape=box style=filled]
+		nest0_3 [label="Ethical Use of Social Media" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+		nest0_0 -> nest0_1 [label="shares links" color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label="manages messages" color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label="engages audiences" color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="builds groups" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="collaborates with influencers" color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="manages crises" color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [label="runs polls" color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S0 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_227.txt b/test/graphviz/scanned_medium/graphviz_227.txt
new file mode 100644
index 0000000000000000000000000000000000000000..928952c65d2da1f725f6ab44384cc3f7ed0fc3cb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_227.txt
@@ -0,0 +1,23 @@
+<Audience Engagement, manages crises, Scheduling Posts>
+<Audience Engagement, runs polls, User_Generated Content Curation>
+<Community Management, connectedTo, Social Selling>
+<Competitor Analysis, connectedTo, Crisis Communication Plan>
+<Competitor Analysis, connectedTo, Emerging Platform Exploration>
+<Competitor Analysis, connectedTo, Social Selling>
+<Competitor Analysis, engages audiences, Crisis Management>
+<Content Strategy, connectedTo, Ethical Use of Social Media>
+<Content Strategy, partOf, Content Strategy>
+<Crisis Communication Plan, connectedTo, Platform Selection>
+<Crisis Management, builds groups, Community Management>
+<Crisis Management, connectedTo, Social Selling>
+<Emerging Platform Exploration, connectedTo, Trend Monitoring>
+<Ethical Use of Social Media, connectedTo, Community Management>
+<Ethical Use of Social Media, partOf, Ethical Use of Social Media>
+<Paid Social Media Advertising, collaborates with influencers, Crisis Communication Plan>
+<Personal Branding on Social Media, manages messages, Content Strategy>
+<Personal Branding on Social Media, partOf, Personal Branding on Social Media>
+<Platform Selection, connectedTo, Audience Engagement>
+<Scheduling Posts, connectedTo, Emerging Platform Exploration>
+<Social Selling, connectedTo, Paid Social Media Advertising>
+<User_Generated Content Curation, partOf, User_Generated Content Curation>
+<User_Generated Content Curation, shares links, Personal Branding on Social Media>
diff --git a/test/graphviz/scanned_medium/graphviz_229.dot b/test/graphviz/scanned_medium/graphviz_229.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7901d50a09ec124bca50193ed4e97b77bf659e53
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_229.dot
@@ -0,0 +1,41 @@
+digraph {
+	rankdir=RL
+	N0 [label="Video Search" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Ranking Algorithms" color="#E0E0E0" fillcolor="#EBEBEB" shape=parallelogram style=filled]
+	N2 [label="News Search" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N3 [label="Rank Tracking" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	N4 [label="Content Quality Assessment" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N5 [label="Search Engine Marketing Strategy" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N6 [label="Crawling Websites" color="#FFF176" fillcolor="#FFFDE7" shape=octagon style=filled]
+	N7 [label="Semantic Search" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N8 [label="Indexing Content" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N9 [label="Paid Search Advertising" color="#FFF176" fillcolor="#FFFDE7" shape=oval style=filled]
+	N10 [label="Personalized Search Results" color="#607D8B" fillcolor="#CFD8DC" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Penalties Recovery" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Core Web Vitals Optimization" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+		nest0_1 [label="Off_Page SEO" color="#607D8B" fillcolor="#CFD8DC" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="handles shopping queries" color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="handles voice search" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="processes updates" color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#607D8B" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#607D8B" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [label="generates featured snippets" color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_229.txt b/test/graphviz/scanned_medium/graphviz_229.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8ae0b55666fd6559b5b997aaa793e8d7c82b90d5
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_229.txt
@@ -0,0 +1,19 @@
+<Content Quality Assessment, connectedTo, Search Engine Marketing Strategy>
+<Content Quality Assessment, generates featured snippets, Crawling Websites>
+<Core Web Vitals Optimization, connectedTo, Off_Page SEO>
+<Core Web Vitals Optimization, partOf, Core Web Vitals Optimization>
+<Crawling Websites, connectedTo, Semantic Search>
+<Indexing Content, connectedTo, Paid Search Advertising>
+<News Search, connectedTo, Crawling Websites>
+<News Search, connectedTo, Rank Tracking>
+<Off_Page SEO, connectedTo, Personalized Search Results>
+<Off_Page SEO, partOf, Off_Page SEO>
+<Paid Search Advertising, connectedTo, Personalized Search Results>
+<Rank Tracking, handles voice search, Content Quality Assessment>
+<Ranking Algorithms, handles shopping queries, News Search>
+<Search Engine Marketing Strategy, connectedTo, Crawling Websites>
+<Semantic Search, connectedTo, Core Web Vitals Optimization>
+<Semantic Search, connectedTo, Paid Search Advertising>
+<Semantic Search, connectedTo, Personalized Search Results>
+<Semantic Search, processes updates, Indexing Content>
+<Video Search, connectedTo, Ranking Algorithms>
diff --git a/test/graphviz/scanned_medium/graphviz_23.dot b/test/graphviz/scanned_medium/graphviz_23.dot
new file mode 100644
index 0000000000000000000000000000000000000000..23d0d8c1fc353268a351ac2cbb17c28d45e4acb2
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_23.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=BT
+	N0 [label="Home Security System Activation" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N1 [label="Motion Detection" color="#E91E63" fillcolor="#FCE4EC" shape=hexagon style=filled]
+	N2 [label="Emergency Service Connection" color="#FFDA4E" fillcolor="#FFE88D" shape=folder style=filled]
+	N3 [label="Firmware Update" color="#FFDA4E" fillcolor="#FFE88D" shape=Mdiamond style=filled]
+	N4 [label="Lighting Automation" color="#FFDA4E" fillcolor="#FFE88D" shape=Mdiamond style=filled]
+	N5 [label="Power Outage Notification" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N6 [label="Air Quality Monitoring" color="#81C784" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N7 [label="Smart Appliance Control" color="#81C784" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N8 [label="Garage Door Control" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N9 [label="Thermostat Adjustment" color="#E91E63" fillcolor="#FCE4EC" shape=box style=filled]
+	N10 [label="Leak Detection" color="#E91E63" fillcolor="#FCE4EC" shape=octagon style=filled]
+	N11 [label="Intercom System" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=heats color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=troubleshoots color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=automates color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=secures color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N9 [label=visualizes color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N11 [label=designs color="#81C784" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_233.dot b/test/graphviz/scanned_medium/graphviz_233.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dff674ab3cc7d8e213b01fee1bedf8981d4f8e64
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_233.dot
@@ -0,0 +1,37 @@
+digraph {
+	rankdir=LR
+	N0 [label="Compliance with Data Protection Regulations" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N1 [label=Authorization color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N2 [label="Identity Proofing" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N3 [label="Customer Identity and Access Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N4 [label="Federated Identity Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N5 [label=De_provisioning color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N6 [label="Digital Signatures" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	S0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Identity as a Service" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Digital Certificates" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+		nest0_1 [label="Fraud Detection in Identity" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+		nest0_2 [label="Biometric Authentication" color="#F7BEE0" fillcolor="#FAEBF3" shape=octagon style=filled]
+		nest0_3 [label=Authentication color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="uses blockchain" color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [label="manages wallets" color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label="protects data" color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N3 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_233.txt b/test/graphviz/scanned_medium/graphviz_233.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7b8e842efefdf7fe25b42be139cfdca310b02bb8
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_233.txt
@@ -0,0 +1,19 @@
+<Authentication, connectedTo, Federated Identity Management>
+<Authentication, partOf, Authentication>
+<Authorization, connectedTo, Customer Identity and Access Management>
+<Authorization, connectedTo, Identity Proofing>
+<Biometric Authentication, connectedTo, Authentication>
+<Biometric Authentication, partOf, Biometric Authentication>
+<Compliance with Data Protection Regulations, connectedTo, Authorization>
+<Compliance with Data Protection Regulations, protects data, Customer Identity and Access Management>
+<Customer Identity and Access Management, connectedTo, De_provisioning>
+<Customer Identity and Access Management, connectedTo, Federated Identity Management>
+<Customer Identity and Access Management, manages wallets, Digital Signatures>
+<De_provisioning, connectedTo, Digital Certificates>
+<De_provisioning, connectedTo, Digital Signatures>
+<Digital Certificates, connectedTo, Fraud Detection in Identity>
+<Digital Certificates, partOf, Digital Certificates>
+<Federated Identity Management, connectedTo, De_provisioning>
+<Fraud Detection in Identity, partOf, Fraud Detection in Identity>
+<Fraud Detection in Identity, uses blockchain, Biometric Authentication>
+<Identity Proofing, connectedTo, Customer Identity and Access Management>
diff --git a/test/graphviz/scanned_medium/graphviz_235.dot b/test/graphviz/scanned_medium/graphviz_235.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1ee47e0cee27033a1fa5b4da1761525b2dac7201
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_235.dot
@@ -0,0 +1,45 @@
+digraph {
+	rankdir=RL
+	N0 [label="AI in Online Education" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N1 [label="Personalized Learning Paths" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N2 [label="Adaptive Learning Technologies" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N3 [label="Certification Issuance" color="#7986CB" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N4 [label="Digital Badges" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N5 [label="Interactive Learning Activities" color="#7986CB" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N6 [label="Test Preparation Courses" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N7 [label="Student Progress Tracking" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+	N8 [label="Virtual Labs and Simulations" color="#AABEC6" fillcolor="#E0E6E9" shape=octagon style=filled]
+	N9 [label="Collaborative Projects" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	S0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFE69C" fillcolor="#FFF9D4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Gamification in Education" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Content Creation" color="#FFE69C" fillcolor="#FFF9D4" shape=octagon style=filled]
+		nest0_1 [label="Blended Learning Models" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+		nest0_2 [label="Peer_to_Peer Learning" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label="provides formative assessment" color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N1 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [label="issues badges" color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [label="provides OER" color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label="engages parents" color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_236.txt b/test/graphviz/scanned_medium/graphviz_236.txt
new file mode 100644
index 0000000000000000000000000000000000000000..84e32cad2cbe23a7e4e6edf99f0dc707444fa12e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_236.txt
@@ -0,0 +1,20 @@
+<AI in Online Education, connectedTo, Bootcamp Development>
+<Accreditation Management, connectedTo, Blended Learning Models>
+<Accreditation Management, partOf, Accreditation Management>
+<Assessment Design, gamifies experiences, Collaborative Projects>
+<Blended Learning Models, connectedTo, Digital Badges>
+<Blended Learning Models, partOf, Blended Learning Models>
+<Bootcamp Development, connectedTo, Assessment Design>
+<Digital Badges, partOf, Digital Badges>
+<Digital Badges, simulates labs, Personalized Learning Paths>
+<Gamification in Education, connectedTo, Online Tutoring>
+<Online Tutoring, administers assessments, Assessment Design>
+<Online Tutoring, connectedTo, AI in Online Education>
+<Online Tutoring, connectedTo, Assessment Design>
+<Online Tutoring, manages student info, Accreditation Management>
+<Online Tutoring, uses blockchain for credentials, Virtual Labs and Simulations>
+<Personalized Learning Paths, integrates robotics, Collaborative Projects>
+<Personalized Learning Paths, partOf, Personalized Learning Paths>
+<Virtual Classroom Facilitation, connectedTo, AI in Online Education>
+<Virtual Classroom Facilitation, issues certificates, Assessment Design>
+<Virtual Labs and Simulations, connectedTo, Virtual Classroom Facilitation>
diff --git a/test/graphviz/scanned_medium/graphviz_238.txt b/test/graphviz/scanned_medium/graphviz_238.txt
new file mode 100644
index 0000000000000000000000000000000000000000..09ebaf9f4d2aea29efece0e0f4e0a3923a62bbc8
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_238.txt
@@ -0,0 +1,23 @@
+<Career Pathway Mapping, connectedTo, Forum Moderation>
+<Career Pathway Mapping, partOf, Career Pathway Mapping>
+<Continuous Course Improvement, connectedTo, Learner Analytics>
+<Continuous Course Improvement, connectedTo, Learner Support>
+<Continuous Course Improvement, connectedTo, Self_Paced Learning Tracks>
+<Corporate Training Solutions, connectedTo, Career Pathway Mapping>
+<Corporate Training Solutions, partOf, Corporate Training Solutions>
+<Course Audit Options, connectedTo, Micro_credential Stacking>
+<Course Content Development, connectedTo, Learner Analytics>
+<Course Content Development, facilitates peer review, Course Audit Options>
+<Discussion Forum Management, connectedTo, Course Content Development>
+<Discussion Forum Management, connectedTo, Forum Moderation>
+<Forum Moderation, connectedTo, Course Content Development>
+<Forum Moderation, connectedTo, Micro_credential Stacking>
+<Forum Moderation, provides accessibility, Course Audit Options>
+<Learner Support, partOf, Learner Support>
+<Learner Support, provides readings, Corporate Training Solutions>
+<Marketing to Global Audience, optimizes engagement, Subscription Models>
+<Micro_credential Stacking, monetizes offerings, Continuous Course Improvement>
+<Platform Selection, promotes courses, Learner Analytics>
+<Self_Paced Learning Tracks, connectedTo, Platform Selection>
+<Subscription Models, connectedTo, Course Content Development>
+<Subscription Models, connectedTo, Discussion Forum Management>
diff --git a/test/graphviz/scanned_medium/graphviz_239.dot b/test/graphviz/scanned_medium/graphviz_239.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1219effb37211b81633db912b4cecfe28e932988
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_239.dot
@@ -0,0 +1,43 @@
+digraph {
+	rankdir=BT
+	N0 [label="Industry Collaboration for Content" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Gamification for Engagement" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+	N2 [label="Micro_credential Stacking" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N3 [label="Instructor_Led Sessions" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N4 [label="Technical Infrastructure for Scale" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N5 [label="Learner Feedback Analysis" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N6 [label="Self_Paced Learning Tracks" color="#AED581" fillcolor="#F0F4C3" shape=plaintext style=filled]
+	N7 [label="Subscription Models" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	S0 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AED581" fillcolor="#F0F4C3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Learner Support" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Course Audit Options" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+		nest0_1 [label="University Partnerships" color="#AED581" fillcolor="#F0F4C3" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="tracks completion" color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="collaborates with experts" color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="secures data" color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [label="expands reach" color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label="analyzes data" color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [label="issues statements of accomplishment" color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label="provides accessibility" color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label="innovates pedagogy" color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [label="promotes courses" color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_24.dot b/test/graphviz/scanned_medium/graphviz_24.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dbac415048f18766b5897bf6c5041d1414256678
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_24.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=BT
+	N0 [label="Smart Lighting" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N1 [label="Smart Traffic Lights" color="#5C6BC0" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N2 [label="Predictive Maintenance for Utilities" color="#3F51B5" fillcolor="#C5CAE9" shape=oval style=filled]
+	N3 [label="Smart Education Initiatives" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N4 [label="Smart Street Furniture" color="#5C6BC0" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N5 [label="Data Privacy Protection" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N6 [label="Sustainable Resource Management" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N7 [label="Intelligent Public Safety Cameras" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=protects color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=monitors color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=engages color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N6 [label=collects color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_24.txt b/test/graphviz/scanned_medium/graphviz_24.txt
new file mode 100644
index 0000000000000000000000000000000000000000..399ded0685bee700a28d6061db3181e4e1220df0
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_24.txt
@@ -0,0 +1,8 @@
+<Data Privacy Protection, connectedTo, Sustainable Resource Management>
+<Predictive Maintenance for Utilities, collects, Sustainable Resource Management>
+<Predictive Maintenance for Utilities, monitors, Smart Education Initiatives>
+<Smart Education Initiatives, engages, Smart Street Furniture>
+<Smart Lighting, connectedTo, Smart Traffic Lights>
+<Smart Street Furniture, connectedTo, Data Privacy Protection>
+<Smart Traffic Lights, protects, Predictive Maintenance for Utilities>
+<Sustainable Resource Management, connectedTo, Intelligent Public Safety Cameras>
diff --git a/test/graphviz/scanned_medium/graphviz_242.dot b/test/graphviz/scanned_medium/graphviz_242.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2c00da11f6503c05c43b04e2d77d397c18f58935
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_242.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Home Care Visit" color="#D2D2D2" fillcolor="#F0F0F0" shape=ellipse style=filled]
+	N1 [label="Pharmacy Order" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N2 [label="Rehabilitation Therapy" color="#FFDA4E" fillcolor="#FFE88D" shape=diamond style=filled]
+	N3 [label="Pain Management" color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+	N4 [label="Patient Education" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N5 [label="Health Screening" color="#FFDA4E" fillcolor="#FFE88D" shape=Mdiamond style=filled]
+	N6 [label="Mental Health Assessment" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+	N7 [label="Symptom Monitoring" color="#D2D2D2" fillcolor="#F0F0F0" shape=octagon style=filled]
+	N8 [label="Allergy Test" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N9 [label="Telemedicine Consultation" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N10 [label=Referral color="#00BCD4" fillcolor="#E0F7FA" shape=folder style=filled]
+	N11 [label="Patient Transfer" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	N12 [label="Emergency Response" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+	N13 [label=Triage color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N14 [label="Nutritional Counseling" color="#FFDA4E" fillcolor="#FFE88D" shape=ellipse style=filled]
+	S0 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#D2D2D2" fillcolor="#F0F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFDA4E" fillcolor="#FFE88D" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Physical Examination" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Medical Record Keeping" color="#D2D2D2" fillcolor="#F0F0F0" shape=oval style=filled]
+		nest0_1 [label="Wound Care" color="#D2D2D2" fillcolor="#F0F0F0" shape=box style=filled]
+		nest0_2 [label="Case Review" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_3 [label="Medication Dispensing" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Medical History" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Insurance Claim" color="#FFDA4E" fillcolor="#FFE88D" shape=box style=filled]
+		nest1_1 [label="Lab Test" color="#00BCD4" fillcolor="#E0F7FA" shape=oval style=filled]
+		nest1_2 [label="Anesthesia Administration" color="#D2D2D2" fillcolor="#F0F0F0" shape=Mdiamond style=filled]
+		nest1_3 [label="Treatment Plan" color="#D2D2D2" fillcolor="#F0F0F0" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=educates color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFDA4E" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=assesses color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N3 -> M1 [label=counsels color="#D2D2D2" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#D2D2D2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_242.txt b/test/graphviz/scanned_medium/graphviz_242.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fb55916b8de18c8995f667e95fefd5edc5961141
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_242.txt
@@ -0,0 +1,42 @@
+<Allergy Test, connectedTo, Telemedicine Consultation>
+<Anesthesia Administration, connectedTo, Treatment Plan>
+<Anesthesia Administration, partOf, Anesthesia Administration>
+<Case Review, connectedTo, Medication Dispensing>
+<Case Review, partOf, Case Review>
+<Emergency Response, connectedTo, Triage>
+<Health Screening, connectedTo, Mental Health Assessment>
+<Home Care Visit, connectedTo, Pharmacy Order>
+<Insurance Claim, connectedTo, Lab Test>
+<Insurance Claim, partOf, Insurance Claim>
+<Lab Test, connectedTo, Anesthesia Administration>
+<Lab Test, partOf, Lab Test>
+<Medical Record Keeping, connectedTo, Wound Care>
+<Medical Record Keeping, partOf, Medical Record Keeping>
+<Medication Dispensing, connectedTo, Nutritional Counseling>
+<Medication Dispensing, partOf, Medication Dispensing>
+<Mental Health Assessment, connectedTo, Symptom Monitoring>
+<Pain Management, connectedTo, Patient Education>
+<Pain Management, counsels, Mental Health Assessment>
+<Patient Education, connectedTo, Health Screening>
+<Patient Education, connectedTo, Mental Health Assessment>
+<Patient Education, connectedTo, Patient Transfer>
+<Patient Transfer, connectedTo, Emergency Response>
+<Pharmacy Order, connectedTo, Mental Health Assessment>
+<Pharmacy Order, connectedTo, Rehabilitation Therapy>
+<Referral, connectedTo, Patient Transfer>
+<Rehabilitation Therapy, connectedTo, Medical Record Keeping>
+<Rehabilitation Therapy, connectedTo, Mental Health Assessment>
+<Rehabilitation Therapy, connectedTo, Telemedicine Consultation>
+<Rehabilitation Therapy, educates, Pain Management>
+<Symptom Monitoring, connectedTo, Allergy Test>
+<Symptom Monitoring, connectedTo, Nutritional Counseling>
+<Symptom Monitoring, connectedTo, Patient Transfer>
+<Symptom Monitoring, connectedTo, Referral>
+<Telemedicine Consultation, assesses, Referral>
+<Telemedicine Consultation, connectedTo, Insurance Claim>
+<Telemedicine Consultation, connectedTo, Patient Transfer>
+<Treatment Plan, connectedTo, Telemedicine Consultation>
+<Treatment Plan, partOf, Treatment Plan>
+<Triage, connectedTo, Nutritional Counseling>
+<Wound Care, connectedTo, Case Review>
+<Wound Care, partOf, Wound Care>
diff --git a/test/graphviz/scanned_medium/graphviz_243.dot b/test/graphviz/scanned_medium/graphviz_243.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e58ee6797710989643ac056c12ae27ce255d8a35
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_243.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=LR
+	N0 [label="Bills of Material Generation" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N1 [label=Painting color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N2 [label="Yield Optimization" color="#6EB76D" fillcolor="#E9F7E8" shape=plaintext style=filled]
+	N3 [label="Quality Control" color="#BCB88A" fillcolor="#F5F5DC" shape=octagon style=filled]
+	N4 [label="Automated Assembly" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N5 [label="Factory Layout Planning" color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+	N6 [label="Supply Chain Synchronization" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	N7 [label="Tool Path Generation" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N8 [label="Supplier Qualification" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N9 [label="Workflow Optimization" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+	N10 [label="Product Design" color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	N11 [label="Final Testing" color="#6EB76D" fillcolor="#E9F7E8" shape=octagon style=filled]
+	N12 [label="Machine Calibration" color="#BCB88A" fillcolor="#F5F5DC" shape=diamond style=filled]
+	N13 [label="Batch Tracking" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	S0 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#BCB88A" fillcolor="#F5F5DC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label=Maintenance labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Procurement color="#BCB88A" fillcolor="#F5F5DC" shape=ellipse style=filled]
+		nest0_1 [label="Parts Replacement" color="#6EB76D" fillcolor="#E9F7E8" shape=folder style=filled]
+		nest0_2 [label="Design Review" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Work_in_Progress Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Packaging color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+		nest1_1 [label="Inventory Check" color="#BCB88A" fillcolor="#F5F5DC" shape=box style=filled]
+		nest1_2 [label="Raw Material" color="#BDAFA8" fillcolor="#E4E0DF" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N13 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N5 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N10 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#BCB88A" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+	M1 -> N11 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#BDAFA8" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#BCB88A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_243.txt b/test/graphviz/scanned_medium/graphviz_243.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c99a8262efc7dd072584e1ed7616310fd6d99a27
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_243.txt
@@ -0,0 +1,34 @@
+<Automated Assembly, connectedTo, Factory Layout Planning>
+<Bills of Material Generation, connectedTo, Factory Layout Planning>
+<Bills of Material Generation, connectedTo, Painting>
+<Design Review, connectedTo, Batch Tracking>
+<Design Review, partOf, Design Review>
+<Factory Layout Planning, connectedTo, Procurement>
+<Factory Layout Planning, connectedTo, Supply Chain Synchronization>
+<Final Testing, connectedTo, Machine Calibration>
+<Inventory Check, connectedTo, Raw Material>
+<Inventory Check, partOf, Inventory Check>
+<Machine Calibration, connectedTo, Batch Tracking>
+<Packaging, connectedTo, Inventory Check>
+<Packaging, partOf, Packaging>
+<Painting, connectedTo, Factory Layout Planning>
+<Painting, connectedTo, Final Testing>
+<Painting, connectedTo, Yield Optimization>
+<Parts Replacement, connectedTo, Design Review>
+<Parts Replacement, partOf, Parts Replacement>
+<Procurement, connectedTo, Parts Replacement>
+<Procurement, partOf, Procurement>
+<Product Design, connectedTo, Batch Tracking>
+<Product Design, connectedTo, Final Testing>
+<Product Design, connectedTo, Machine Calibration>
+<Quality Control, connectedTo, Automated Assembly>
+<Quality Control, connectedTo, Packaging>
+<Raw Material, connectedTo, Factory Layout Planning>
+<Raw Material, partOf, Raw Material>
+<Supplier Qualification, connectedTo, Workflow Optimization>
+<Supply Chain Synchronization, connectedTo, Tool Path Generation>
+<Tool Path Generation, connectedTo, Supplier Qualification>
+<Workflow Optimization, connectedTo, Product Design>
+<Yield Optimization, connectedTo, Factory Layout Planning>
+<Yield Optimization, connectedTo, Final Testing>
+<Yield Optimization, connectedTo, Quality Control>
diff --git a/test/graphviz/scanned_medium/graphviz_244.dot b/test/graphviz/scanned_medium/graphviz_244.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d6399c6d5c0f91f419239395ee19df9f088ec6dc
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_244.dot
@@ -0,0 +1,58 @@
+digraph {
+	rankdir=TD
+	N0 [label="Advisory Committee Meeting" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N1 [label="Student Application" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N2 [label="Extracurricular Activity" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N3 [label="Student Feedback Collection" color="#FFEB3B" fillcolor="#FFF9C4" shape=octagon style=filled]
+	N4 [label="Assignment Submission" color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N5 [label="Thesis Submission" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N6 [label="Graduation Approval" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N7 [label=Orientation color="#FFEB3B" fillcolor="#FFF9C4" shape=parallelogram style=filled]
+	N8 [label="Research Grant Application" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Study Abroad Program" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Library Registration" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+		nest0_1 [label="Disciplinary Action" color="#CD8FF2" fillcolor="#ECCFF5" shape=folder style=filled]
+		nest0_2 [label="Academic Review" color="#82DAFF" fillcolor="#C8EDFF" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [label=trains color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Course Material Preparation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Digital Resource Management" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+		nest1_1 [label="Grade Entry" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+		nest1_2 [label="Online Learning Platform Management" color="#82DAFF" fillcolor="#C8EDFF" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=updates color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N0 -> S1 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N2 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [label=guides color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_245.dot b/test/graphviz/scanned_medium/graphviz_245.dot
new file mode 100644
index 0000000000000000000000000000000000000000..13d7a789ddca91ab00be68c98f8ed260c04d3b00
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_245.dot
@@ -0,0 +1,61 @@
+digraph {
+	rankdir=LR
+	N0 [label="Package Return" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N1 [label=Shipment color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N2 [label="Cross_selling Recommendation" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N3 [label="Price Adjustment" color="#FFEB3B" fillcolor="#FFF9C4" shape=diamond style=filled]
+	N4 [label="Payment Gateway Reconciliation" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+	N5 [label="Promotion Application" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N6 [label=Payment color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N7 [label="Refund Process" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N8 [label="Subscription Service" color="#FFC085" fillcolor="#FFDAB9" shape=oval style=filled]
+	N9 [label="Customer Review" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFEB3B" fillcolor="#FFF9C4" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Loyalty Points" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Gift Card Purchase" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+		nest0_1 [label="Supplier Onboarding" color="#E91E63" fillcolor="#F8BBD0" shape=octagon style=filled]
+		nest0_2 [label="Wishlist Management" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label=Checkout labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Inventory Update" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+		nest1_1 [label="Return Merchandise Authorization" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_2 [label="Search Engine Optimization" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> S0 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [label=routes color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_245.txt b/test/graphviz/scanned_medium/graphviz_245.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f0b8c634909785c2244c23548b527017440d2463
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_245.txt
@@ -0,0 +1,31 @@
+<Cross_selling Recommendation, connectedTo, Price Adjustment>
+<Gift Card Purchase, connectedTo, Supplier Onboarding>
+<Gift Card Purchase, partOf, Gift Card Purchase>
+<Inventory Update, connectedTo, Return Merchandise Authorization>
+<Inventory Update, partOf, Inventory Update>
+<Package Return, connectedTo, Cross_selling Recommendation>
+<Package Return, connectedTo, Price Adjustment>
+<Package Return, connectedTo, Shipment>
+<Payment, connectedTo, Customer Review>
+<Payment, connectedTo, Refund Process>
+<Payment, connectedTo, Subscription Service>
+<Payment Gateway Reconciliation, connectedTo, Promotion Application>
+<Price Adjustment, connectedTo, Payment Gateway Reconciliation>
+<Promotion Application, connectedTo, Gift Card Purchase>
+<Promotion Application, connectedTo, Payment>
+<Refund Process, connectedTo, Subscription Service>
+<Return Merchandise Authorization, connectedTo, Search Engine Optimization>
+<Return Merchandise Authorization, partOf, Return Merchandise Authorization>
+<Search Engine Optimization, connectedTo, Price Adjustment>
+<Search Engine Optimization, partOf, Search Engine Optimization>
+<Shipment, connectedTo, Cross_selling Recommendation>
+<Shipment, connectedTo, Customer Review>
+<Shipment, connectedTo, Payment Gateway Reconciliation>
+<Shipment, connectedTo, Price Adjustment>
+<Shipment, routes, Price Adjustment>
+<Subscription Service, connectedTo, Customer Review>
+<Subscription Service, connectedTo, Inventory Update>
+<Supplier Onboarding, connectedTo, Wishlist Management>
+<Supplier Onboarding, partOf, Supplier Onboarding>
+<Wishlist Management, connectedTo, Cross_selling Recommendation>
+<Wishlist Management, partOf, Wishlist Management>
diff --git a/test/graphviz/scanned_medium/graphviz_246.dot b/test/graphviz/scanned_medium/graphviz_246.dot
new file mode 100644
index 0000000000000000000000000000000000000000..303cafb5238f4e8d2c1c76e289ae90e09b3758cc
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_246.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=RL
+	N0 [label="Fare Calculation" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N1 [label="Vehicle Assignment" color="#2196F3" fillcolor="#BBDEFB" shape=Mdiamond style=filled]
+	N2 [label="Schedule Generation" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N3 [label="Road Network Management" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N4 [label="Vehicle Tracking" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N5 [label="Accident Reconstruction" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N6 [label="Cargo Loading" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N7 [label="Load Balancing" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N8 [label="Customs Clearance" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N9 [label="Platform Assignment" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+	N10 [label="Driver Allocation" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N11 [label="Passenger Feedback" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N12 [label="Parking Management" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N13 [label="Delay Alert" color="#9C27B0" fillcolor="#E1BEE7" shape=oval style=filled]
+	N14 [label="Weather Impact Assessment" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N15 [label="Public Transport Ticketing" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N16 [label="Fleet Management" color="#9C27B0" fillcolor="#E1BEE7" shape=parallelogram style=filled]
+	N17 [label="Bridge Inspection" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N18 [label=Boarding color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label=Fueling labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Location Input" color="#2196F3" fillcolor="#BBDEFB" shape=diamond style=filled]
+		nest0_1 [label="Emergency Landing" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+		nest0_2 [label="Bus Stop Management" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=audits color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Intermodal Transfer" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Passenger Boarding Pass Issuance" color="#FFC107" fillcolor="#FFECB3" shape=hexagon style=filled]
+		nest1_1 [label="Incident Report" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=logs color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=boards color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=fuels color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=inspects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N14 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [label=coordinates color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N11 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> S1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [label=arrives color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S2 -> N16 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N6 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N8 -> M0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	M0 -> N14 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_249.dot b/test/graphviz/scanned_medium/graphviz_249.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5d78c378a4c4a7e2506bd9884669670d4fe9565a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_249.dot
@@ -0,0 +1,69 @@
+digraph {
+	rankdir=BT
+	N0 [label="Barcode Scanning" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Carrier Selection" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N2 [label="Hazardous Material Transport" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N3 [label="Package Labeling" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+	N4 [label="Route Assignment" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N5 [label="Global Trade Compliance" color="#4DB6AC" fillcolor="#E0F2F1" shape=octagon style=filled]
+	N6 [label="Inventory Sync" color="#9FA9E1" fillcolor="#D6D9F0" shape=oval style=filled]
+	N7 [label="Rail Transport Coordination" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N8 [label="Ocean Freight Management" color="#4DB6AC" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#4DB6AC" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Delivery Confirmation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Yard Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+		nest0_1 [label="Damage Reporting" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_2 [label="Cargo Tracking" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+		nest0_3 [label=Deconsolidation color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Hub Transfer" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Pickup Request" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+		nest1_1 [label="Demand Forecasting Integration" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_2 [label="Air Cargo Handling" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+		nest1_3 [label="Pallet Stacking" color="#4DB6AC" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=distributes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=clears color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [label=automates color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N8 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_25.dot b/test/graphviz/scanned_medium/graphviz_25.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6d3e9bd8061de8c7ba4766d74a8af4cdfa910fa2
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_25.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=BT
+	N0 [label="Clinical Trial Design" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Bioinformatics Analysis" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N2 [label="Structural Biology" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N3 [label="Target Identification" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N4 [label="Synthetic Biology Design" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N5 [label="Ethical Review Board Approval" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N6 [label="Lab Automation" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N7 [label="Computational Biology Modeling" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N8 [label="Preclinical Testing" color="#E0E0E0" fillcolor="#EBEBEB" shape=plaintext style=filled]
+	N9 [label="Gene Therapy Delivery" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N0 -> N1 [label=modifies color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=licenses color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=innovates color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=isolates color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N1 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_250.dot b/test/graphviz/scanned_medium/graphviz_250.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a4b60812554a9c82aa5605a1ca7f84bc5d45faea
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_250.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Contract Termination" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N1 [label="Plan Suspension" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N2 [label="Video Conferencing" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+	N3 [label="Base Station Installation" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N4 [label="Fraudulent Call Blocking" color="#66BB6A" fillcolor="#E8F5E9" shape=oval style=filled]
+	N5 [label="Payment Received" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N6 [label="Network Activation" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	N7 [label="Billing Inquiry" color="#42A5F5" fillcolor="#F1F8FF" shape=oval style=filled]
+	N8 [label="Service Level Agreement" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N9 [label="Network Upgrade" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N10 [label="Outage Detection" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N11 [label="Speed Throttling" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N12 [label="SIM Registration" color="#FF8A65" fillcolor="#FBE9E7" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF8A65" fillcolor="#FBE9E7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#66BB6A" fillcolor="#E8F5E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Bandwidth Allocation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="MMS Transmission" color="#66BB6A" fillcolor="#E8F5E9" shape=box style=filled]
+		nest0_1 [label="Call Recording" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+		nest0_2 [label="Bill Generation" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Customer Relationship Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Spectrum Management" color="#66BB6A" fillcolor="#E8F5E9" shape=parallelogram style=filled]
+		nest1_1 [label="Data Usage Logging" color="#FF8A65" fillcolor="#FBE9E7" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=monitors color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N1 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S0 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=controls color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M2 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_251.dot b/test/graphviz/scanned_medium/graphviz_251.dot
new file mode 100644
index 0000000000000000000000000000000000000000..262ebe5331dea61b1a680c3090485087de168737
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_251.dot
@@ -0,0 +1,84 @@
+digraph {
+	rankdir=BT
+	N0 [label="Fertilizer Application" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label="Subsidy Application" color="#EAEFA5" fillcolor="#FDFCEB" shape=Mdiamond style=filled]
+	N2 [label="Irrigation Scheduling" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N3 [label="Soil Nutrient Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N4 [label="Greenhouse Control" color="#9C27B0" fillcolor="#E1BEE7" shape=plaintext style=filled]
+	N5 [label="Soil Testing" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N6 [label="Yield Prediction" color="#FF5722" fillcolor="#FFCCBC" shape=octagon style=filled]
+	N7 [label=Storage color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N8 [label="Drone Scouting" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N9 [label="Hydroponic System Management" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N10 [label="Packaging for Sale" color="#9C27B0" fillcolor="#E1BEE7" shape=oval style=filled]
+	N11 [label="Forestry Management" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N12 [label="Seedling Transplanting" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N13 [label="Weather Tracking" color="#9C27B0" fillcolor="#E1BEE7" shape=hexagon style=filled]
+	N14 [label="Agricultural Research" color="#9C27B0" fillcolor="#E1BEE7" shape=folder style=filled]
+	N15 [label="Precision Farming" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N16 [label="Equipment Repair" color="#9C27B0" fillcolor="#E1BEE7" shape=Mdiamond style=filled]
+	N17 [label="Farm Machinery Operation" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N18 [label="Weed Removal" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	S0 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FF5722" fillcolor="#FFCCBC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9C27B0" fillcolor="#E1BEE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Traceability System" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Organic Certification" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_1 [label="Grain Drying" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest0_2 [label="Supply Chain to Retailers" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Disease Detection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Water Level Measurement" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+		nest1_1 [label="Automated Milking" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N8 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N17 -> nest1_0 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N11 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N18 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#FF5722" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N17 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	S2 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> M0 [color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#9C27B0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N15 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_251.txt b/test/graphviz/scanned_medium/graphviz_251.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6d7af75721a058efc14a6827855ca4f100e5f30d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_251.txt
@@ -0,0 +1,44 @@
+<Agricultural Research, connectedTo, Precision Farming>
+<Automated Milking, connectedTo, Forestry Management>
+<Automated Milking, partOf, Automated Milking>
+<Drone Scouting, connectedTo, Hydroponic System Management>
+<Drone Scouting, connectedTo, Organic Certification>
+<Drone Scouting, connectedTo, Precision Farming>
+<Equipment Repair, connectedTo, Farm Machinery Operation>
+<Farm Machinery Operation, connectedTo, Water Level Measurement>
+<Farm Machinery Operation, connectedTo, Weed Removal>
+<Fertilizer Application, connectedTo, Subsidy Application>
+<Fertilizer Application, connectedTo, Weed Removal>
+<Forestry Management, connectedTo, Agricultural Research>
+<Forestry Management, connectedTo, Farm Machinery Operation>
+<Forestry Management, connectedTo, Precision Farming>
+<Forestry Management, connectedTo, Seedling Transplanting>
+<Grain Drying, connectedTo, Supply Chain to Retailers>
+<Grain Drying, partOf, Grain Drying>
+<Greenhouse Control, connectedTo, Soil Testing>
+<Hydroponic System Management, connectedTo, Packaging for Sale>
+<Hydroponic System Management, connectedTo, Weed Removal>
+<Irrigation Scheduling, connectedTo, Soil Nutrient Management>
+<Organic Certification, connectedTo, Grain Drying>
+<Organic Certification, partOf, Organic Certification>
+<Packaging for Sale, connectedTo, Forestry Management>
+<Precision Farming, connectedTo, Equipment Repair>
+<Seedling Transplanting, connectedTo, Weather Tracking>
+<Soil Nutrient Management, connectedTo, Greenhouse Control>
+<Soil Testing, connectedTo, Precision Farming>
+<Soil Testing, connectedTo, Yield Prediction>
+<Storage, connectedTo, Drone Scouting>
+<Subsidy Application, connectedTo, Irrigation Scheduling>
+<Subsidy Application, connectedTo, Weather Tracking>
+<Subsidy Application, connectedTo, Weed Removal>
+<Subsidy Application, connectedTo, Yield Prediction>
+<Supply Chain to Retailers, connectedTo, Drone Scouting>
+<Supply Chain to Retailers, partOf, Supply Chain to Retailers>
+<Water Level Measurement, connectedTo, Automated Milking>
+<Water Level Measurement, partOf, Water Level Measurement>
+<Weather Tracking, connectedTo, Agricultural Research>
+<Weather Tracking, connectedTo, Equipment Repair>
+<Weather Tracking, connectedTo, Precision Farming>
+<Weather Tracking, connectedTo, Weed Removal>
+<Yield Prediction, connectedTo, Precision Farming>
+<Yield Prediction, connectedTo, Storage>
diff --git a/test/graphviz/scanned_medium/graphviz_253.dot b/test/graphviz/scanned_medium/graphviz_253.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3658dd103c49c337396aceaada71a005455b202a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_253.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=BT
+	N0 [label="Closing Meeting" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Land Acquisition" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N2 [label="Eviction Process" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N3 [label="Ownership Transfer" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+	N4 [label="Property Management" color="#DCE775" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N5 [label="Renovation Planning" color="#7E57C2" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N6 [label="Maintenance Request" color="#DCE775" fillcolor="#F9FBE7" shape=oval style=filled]
+	N7 [label="Market Trend Analysis" color="#DCE775" fillcolor="#F9FBE7" shape=parallelogram style=filled]
+	N8 [label="Lease Renewal" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N9 [label="Property Valuation" color="#7E57C2" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N10 [label="Commission Distribution" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N11 [label="Open House Event" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+	N12 [label="Contract Review" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	S0 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#73C6BC" fillcolor="#D0EFEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#DCE775" fillcolor="#F9FBE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Property Listing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Loan Pre_Approval" color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+		nest0_1 [label="Site Visit Scheduling" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+		nest0_2 [label="Building Permit Application" color="#DCE775" fillcolor="#F9FBE7" shape=folder style=filled]
+		nest0_3 [label="Document Signing" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [label=renovates color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Property Appraisal" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Commercial Lease Negotiation" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+		nest1_1 [label="Home Inspection" color="#73C6BC" fillcolor="#D0EFEE" shape=hexagon style=filled]
+		nest1_2 [label="Price Negotiation" color="#73C6BC" fillcolor="#D0EFEE" shape=folder style=filled]
+		nest1_0 -> nest1_1 [label=assigns color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=lists color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N1 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> nest1_0 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N7 -> S2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [label=manages color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M1 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_253.txt b/test/graphviz/scanned_medium/graphviz_253.txt
new file mode 100644
index 0000000000000000000000000000000000000000..46ff972b1983022d16595ced676cef59e3303212
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_253.txt
@@ -0,0 +1,38 @@
+<Building Permit Application, connectedTo, Document Signing>
+<Building Permit Application, partOf, Building Permit Application>
+<Closing Meeting, connectedTo, Land Acquisition>
+<Closing Meeting, connectedTo, Market Trend Analysis>
+<Commercial Lease Negotiation, assigns, Home Inspection>
+<Commercial Lease Negotiation, partOf, Commercial Lease Negotiation>
+<Commission Distribution, lists, Open House Event>
+<Document Signing, connectedTo, Renovation Planning>
+<Document Signing, partOf, Document Signing>
+<Eviction Process, connectedTo, Ownership Transfer>
+<Home Inspection, connectedTo, Price Negotiation>
+<Home Inspection, partOf, Home Inspection>
+<Land Acquisition, connectedTo, Eviction Process>
+<Land Acquisition, connectedTo, Loan Pre_Approval>
+<Lease Renewal, connectedTo, Property Valuation>
+<Loan Pre_Approval, partOf, Loan Pre_Approval>
+<Loan Pre_Approval, renovates, Site Visit Scheduling>
+<Maintenance Request, connectedTo, Market Trend Analysis>
+<Market Trend Analysis, connectedTo, Commission Distribution>
+<Market Trend Analysis, connectedTo, Lease Renewal>
+<Market Trend Analysis, connectedTo, Open House Event>
+<Market Trend Analysis, manages, Property Valuation>
+<Open House Event, connectedTo, Contract Review>
+<Ownership Transfer, connectedTo, Property Management>
+<Price Negotiation, connectedTo, Open House Event>
+<Price Negotiation, partOf, Price Negotiation>
+<Property Management, connectedTo, Lease Renewal>
+<Property Management, connectedTo, Market Trend Analysis>
+<Property Management, connectedTo, Open House Event>
+<Property Management, connectedTo, Property Valuation>
+<Property Management, connectedTo, Renovation Planning>
+<Property Valuation, connectedTo, Commercial Lease Negotiation>
+<Property Valuation, connectedTo, Commission Distribution>
+<Renovation Planning, connectedTo, Commission Distribution>
+<Renovation Planning, connectedTo, Lease Renewal>
+<Renovation Planning, connectedTo, Maintenance Request>
+<Site Visit Scheduling, connectedTo, Building Permit Application>
+<Site Visit Scheduling, partOf, Site Visit Scheduling>
diff --git a/test/graphviz/scanned_medium/graphviz_254.dot b/test/graphviz/scanned_medium/graphviz_254.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d5e8f828ca6dde9d618f277b1a48d6554e36e132
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_254.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=BT
+	N0 [label="Bomb Disposal" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+	N1 [label="Cybersecurity Threat Response" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+	N2 [label="Crowd Management" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N3 [label="Victim Support Services" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N4 [label="K9 Unit Deployment" color="#00BCD4" fillcolor="#E0F7FA" shape=parallelogram style=filled]
+	N5 [label="Patrol Scheduling" color="#7986CB" fillcolor="#E8EAF6" shape=plaintext style=filled]
+	N6 [label="Evidence Collection" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+	N7 [label="Suspect Identification" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N8 [label="Disaster Relief Coordination" color="#00BCD4" fillcolor="#E0F7FA" shape=box style=filled]
+	N9 [label="Shelter Setup" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N10 [label="Threat Assessment" color="#A1D7CD" fillcolor="#EDF5F3" shape=octagon style=filled]
+	N11 [label="Community Outreach" color="#7986CB" fillcolor="#E8EAF6" shape=diamond style=filled]
+	N12 [label="Responder Alert" color="#7986CB" fillcolor="#E8EAF6" shape=octagon style=filled]
+	N13 [label="Incident Command System Activation" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	S0 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A1D7CD" fillcolor="#EDF5F3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#00BCD4" fillcolor="#E0F7FA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Post_Incident Review" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="First Aid Deployment" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+		nest0_1 [label="Public Safety Training" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_2 [label="Court Testimony" color="#00BCD4" fillcolor="#E0F7FA" shape=octagon style=filled]
+		nest0_3 [label="Forensic Analysis" color="#7986CB" fillcolor="#E8EAF6" shape=Mdiamond style=filled]
+		nest0_0 -> nest0_1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Crime Scene Analysis" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Resource Allocation" color="#A1D7CD" fillcolor="#EDF5F3" shape=folder style=filled]
+		nest1_1 [label="Public Warning" color="#A1D7CD" fillcolor="#EDF5F3" shape=Mdiamond style=filled]
+		nest1_2 [label="Evacuation Planning" color="#00BCD4" fillcolor="#E0F7FA" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [label=suppresses color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=analyzes color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N1 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#A1D7CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [label=detains color="#7986CB" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [label=communicates color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	nest0_0 -> N2 [color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_257.txt b/test/graphviz/scanned_medium/graphviz_257.txt
new file mode 100644
index 0000000000000000000000000000000000000000..70d9231502d03034b440e8c3e3f74ee24660cb01
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_257.txt
@@ -0,0 +1,37 @@
+<Citizen Feedback, connectedTo, Open Government Data Initiative>
+<Citizen Feedback, connectedTo, Passport Issuance>
+<Citizen Feedback, connectedTo, Service Registration>
+<Citizen Feedback, connectedTo, Social Program Review>
+<Data Publishing, connectedTo, Public Sector Procurement>
+<Data Publishing, partOf, Data Publishing>
+<Diplomatic Negotiation, connectedTo, Citizen Feedback>
+<Diplomatic Negotiation, connectedTo, Election Management>
+<Diplomatic Negotiation, connectedTo, Legal Advisory>
+<Diplomatic Negotiation, connectedTo, Permit Application>
+<Diplomatic Negotiation, connectedTo, Service Registration>
+<Diplomatic Negotiation, connectedTo, Social Security Administration>
+<Driver's License Renewal, connectedTo, Public Records Request>
+<Driver's License Renewal, partOf, Driver's License Renewal>
+<Education Policy, connectedTo, Grant Distribution>
+<Election Management, connectedTo, Education Policy>
+<Grant Distribution, connectedTo, Passport Issuance>
+<Grant Distribution, connectedTo, Whistleblower Protection>
+<Legal Advisory, connectedTo, Citizen Feedback>
+<Legal Advisory, connectedTo, Data Publishing>
+<Legal Advisory, connectedTo, Permit Application>
+<Passport Issuance, connectedTo, Social Security Administration>
+<Permit Application, connectedTo, Citizen Feedback>
+<Public Consultation, connectedTo, Social Security Administration>
+<Public Consultation, partOf, Public Consultation>
+<Public Records Request, connectedTo, Election Management>
+<Public Records Request, partOf, Public Records Request>
+<Public Sector Procurement, connectedTo, Public Consultation>
+<Public Sector Procurement, partOf, Public Sector Procurement>
+<Public Works Maintenance, connectedTo, Citizen Feedback>
+<Public Works Maintenance, connectedTo, Diplomatic Negotiation>
+<Service Registration, connectedTo, Election Management>
+<Service Registration, connectedTo, Social Program Review>
+<Social Program Review, connectedTo, Election Management>
+<Social Security Administration, approves, Open Government Data Initiative>
+<Whistleblower Protection, connectedTo, Driver's License Renewal>
+<Whistleblower Protection, partOf, Whistleblower Protection>
diff --git a/test/graphviz/scanned_medium/graphviz_259.txt b/test/graphviz/scanned_medium/graphviz_259.txt
new file mode 100644
index 0000000000000000000000000000000000000000..17758aeb43d66b860aa8487510260be7f9f18857
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_259.txt
@@ -0,0 +1,28 @@
+<Brake System Check, connectedTo, Part Manufacturing>
+<Brake System Check, partOf, Brake System Check>
+<Customer Relationship Management, connectedTo, Brake System Check>
+<Customer Relationship Management, partOf, Customer Relationship Management>
+<Customer Test Drive, connectedTo, Diagnostic Trouble Code Reading>
+<Customer Test Drive, connectedTo, Part Manufacturing>
+<Diagnostic Trouble Code Reading, connectedTo, Emission Testing>
+<Diagnostic Trouble Code Reading, connectedTo, Inventory Tracking>
+<Diagnostic Trouble Code Reading, connectedTo, Recall Management>
+<Emission Testing, connectedTo, Customer Relationship Management>
+<Emission Testing, connectedTo, Inventory Tracking>
+<Fluid Level Check, connectedTo, Customer Test Drive>
+<Fluid Level Check, connectedTo, Diagnostic Trouble Code Reading>
+<Fluid Level Check, connectedTo, Infotainment System Integration>
+<Fluid Level Check, connectedTo, Oil Change>
+<Global Supply Chain Management, engineers, Quality Assurance>
+<Global Supply Chain Management, partOf, Global Supply Chain Management>
+<Infotainment System Integration, connectedTo, Customer Test Drive>
+<Infotainment System Integration, connectedTo, Parts Distribution>
+<Inventory Tracking, connectedTo, Recall Management>
+<Oil Change, connectedTo, Diagnostic Trouble Code Reading>
+<Part Manufacturing, connectedTo, Emission Testing>
+<Part Manufacturing, connectedTo, Inventory Tracking>
+<Part Manufacturing, installs, Oil Change>
+<Parts Distribution, connectedTo, Global Supply Chain Management>
+<Parts Distribution, partOf, Parts Distribution>
+<Quality Assurance, connectedTo, Inventory Tracking>
+<Quality Assurance, partOf, Quality Assurance>
diff --git a/test/graphviz/scanned_medium/graphviz_263.dot b/test/graphviz/scanned_medium/graphviz_263.dot
new file mode 100644
index 0000000000000000000000000000000000000000..865d8df550f02505f425fe3cbff2fcb03769c8bb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_263.dot
@@ -0,0 +1,79 @@
+digraph {
+	rankdir=LR
+	N0 [label="Scene Creation" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N1 [label="Home Security System Activation" color="#82DAFF" fillcolor="#C8EDFF" shape=diamond style=filled]
+	N2 [label="Centralized Hub Configuration" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N3 [label="Firmware Update" color="#F7BEE0" fillcolor="#FAEBF3" shape=ellipse style=filled]
+	N4 [label="Irrigation System Control" color="#E57373" fillcolor="#FFEBEE" shape=Mdiamond style=filled]
+	N5 [label="Emergency Service Connection" color="#F7BEE0" fillcolor="#FAEBF3" shape=plaintext style=filled]
+	N6 [label="Automated Vacuum Cleaning" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N7 [label="Door Lock Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N8 [label="Security Alert" color="#F7BEE0" fillcolor="#FAEBF3" shape=diamond style=filled]
+	N9 [label="Doorbell Camera Alert" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+	N10 [label="Pet Feeder Automation" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N11 [label="Thermostat Adjustment" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N12 [label="Curtain Automation" color="#E57373" fillcolor="#FFEBEE" shape=octagon style=filled]
+	N13 [label="Window Sensor Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	N14 [label="Guest Access Management" color="#F7BEE0" fillcolor="#FAEBF3" shape=parallelogram style=filled]
+	N15 [label="Smart Mirror Functionality" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N16 [label="Routine Scheduling" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+	N17 [label="Remote Control" color="#F7BEE0" fillcolor="#FAEBF3" shape=box style=filled]
+	N18 [label="Water Heater Control" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+	S0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#E57373" fillcolor="#FFEBEE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#F7BEE0" fillcolor="#FAEBF3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#82DAFF" fillcolor="#C8EDFF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Garage Door Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Geofencing Trigger" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest0_1 [label="Air Quality Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Smart Plug Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Intercom System" color="#E57373" fillcolor="#FFEBEE" shape=ellipse style=filled]
+		nest1_1 [label="Energy Consumption Optimization" color="#E57373" fillcolor="#FFEBEE" shape=box style=filled]
+		nest1_2 [label="Voice Command" color="#F7BEE0" fillcolor="#FAEBF3" shape=hexagon style=filled]
+		nest1_3 [label="Child Monitoring" color="#E57373" fillcolor="#FFEBEE" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=lights color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=cools color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=learns color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N16 -> nest1_0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	N15 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#E57373" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [label=closes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#F7BEE0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N4 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> M1 [label=controls color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M1 [color="#F7BEE0" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N9 [color="#E57373" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_264.dot b/test/graphviz/scanned_medium/graphviz_264.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c9be6efcc5ce36d14ee19f3979f5fb7871414d17
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_264.dot
@@ -0,0 +1,55 @@
+digraph {
+	rankdir=RL
+	N0 [label="Public Health Monitoring" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Smart Lighting" color="#CD8FF2" fillcolor="#ECCFF5" shape=hexagon style=filled]
+	N2 [label="Disaster Resilience Planning" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N3 [label="Water Management System" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+	N4 [label="Smart Street Furniture" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N5 [label="Sustainable Resource Management" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N6 [label="Traffic Flow Optimization" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N7 [label="Intelligent Public Safety Cameras" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Infrastructure Maintenance Alert" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Citizen Feedback Loop" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+		nest0_1 [label="Urban Planning Data Analysis" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+		nest0_2 [label="City_wide Sensor Network Deployment" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+		nest0_3 [label="Smart Grid Security" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Urban Agriculture Support" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Air Quality Index Reporting" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest1_1 [label="Smart Water Meters" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+		nest1_2 [label="Cybersecurity for Infrastructure" color="#673AB7" fillcolor="#D1C4E9" shape=octagon style=filled]
+		nest1_3 [label="Crowd Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest1_0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N2 -> S0 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N7 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N2 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_265.dot b/test/graphviz/scanned_medium/graphviz_265.dot
new file mode 100644
index 0000000000000000000000000000000000000000..6d6d305f91bfc8e8c9d965eb2e3fdc4873342467
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_265.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Preclinical Testing" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Protein Engineering" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N2 [label="Environmental Bioremediation" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N3 [label="Tissue Engineering" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N4 [label="Intellectual Property Protection" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N5 [label="CRISPR Technology Application" color="#FFA726" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N6 [label="Structural Biology" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N7 [label="Personalized Medicine Formulation" color="#FFF176" fillcolor="#FFFDE7" shape=plaintext style=filled]
+	N8 [label="Diagnostic Test Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N9 [label="Bioprocess Optimization" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#FFA726" fillcolor="#FFF3E0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Clinical Trial Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Computational Biology Modeling" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+		nest0_1 [label="Drug Discovery" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+		nest0_2 [label="Biosensor Development" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Biomarker Discovery" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Genomic Editing" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_1 [label="Gene Therapy Delivery" color="#FFA726" fillcolor="#FFF3E0" shape=octagon style=filled]
+		nest1_2 [label=Bioimaging color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_3 [label=Pharmacogenomics color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=purifies color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=commercializes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N5 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N4 -> nest1_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N1 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	N4 -> S0 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [label=secures color="#FFA726" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=analyzes color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#FFA726" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_266.dot b/test/graphviz/scanned_medium/graphviz_266.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f48b00b46fcecc51b5835d109adff1a844ca5dfb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_266.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=TD
+	N0 [label="Cold Chain Logistics" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Good Manufacturing Practices" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N2 [label="Health Economics Outcomes Research" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N3 [label="Global Regulatory Affairs" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N4 [label="Drug Repurposing" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N5 [label="Patient Adherence Programs" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N6 [label="Manufacturing Scale_up" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N7 [label="Clinical Data Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=plaintext style=filled]
+	N8 [label="Market Access Strategy" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N9 [label="Injectable Drug Manufacturing" color="#81C784" fillcolor="#F1F8E9" shape=oval style=filled]
+	N10 [label="Clinical Trial Phases" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N11 [label="Sales and Marketing Strategy" color="#AF56A6" fillcolor="#DDCEDD" shape=folder style=filled]
+	N12 [label=Distribution color="#AF56A6" fillcolor="#DDCEDD" shape=oval style=filled]
+	N13 [label="Cleanroom Operations" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N14 [label="Patent Application" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N15 [label="Process Validation" color="#81C784" fillcolor="#F1F8E9" shape=folder style=filled]
+	N16 [label="Drug Research" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N17 [label="Quality Control" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+	N18 [label="Drug Stability Testing" color="#81C784" fillcolor="#F1F8E9" shape=folder style=filled]
+	N19 [label="Adverse Event Reporting" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N20 [label="Supply Chain Management" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label=Pharmacovigilance labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Intellectual Property Litigation" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_1 [label=Packaging color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Solid Dosage Formulation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Biostatistics color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+		nest1_1 [label="Regulatory Approval" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=trials color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label=advises color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N19 -> N20 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N16 -> nest0_0 [label=complies color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N17 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> nest1_0 [label=inspects color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N18 [label=tests color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N20 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N16 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [label=sells color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_266.txt b/test/graphviz/scanned_medium/graphviz_266.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6e8aa0db1fa5f6e85911442eecd873c9263ffc72
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_266.txt
@@ -0,0 +1,39 @@
+<Adverse Event Reporting, connectedTo, Supply Chain Management>
+<Biostatistics, connectedTo, Regulatory Approval>
+<Biostatistics, partOf, Biostatistics>
+<Cleanroom Operations, connectedTo, Patent Application>
+<Clinical Data Management, connectedTo, Market Access Strategy>
+<Clinical Trial Phases, trials, Sales and Marketing Strategy>
+<Cold Chain Logistics, connectedTo, Drug Research>
+<Cold Chain Logistics, connectedTo, Good Manufacturing Practices>
+<Distribution, connectedTo, Cleanroom Operations>
+<Drug Repurposing, connectedTo, Cleanroom Operations>
+<Drug Repurposing, connectedTo, Market Access Strategy>
+<Drug Repurposing, connectedTo, Patient Adherence Programs>
+<Drug Repurposing, connectedTo, Process Validation>
+<Drug Research, complies, Intellectual Property Litigation>
+<Drug Research, connectedTo, Quality Control>
+<Drug Stability Testing, connectedTo, Adverse Event Reporting>
+<Global Regulatory Affairs, connectedTo, Drug Repurposing>
+<Good Manufacturing Practices, connectedTo, Health Economics Outcomes Research>
+<Good Manufacturing Practices, connectedTo, Market Access Strategy>
+<Health Economics Outcomes Research, connectedTo, Global Regulatory Affairs>
+<Health Economics Outcomes Research, sells, Market Access Strategy>
+<Injectable Drug Manufacturing, connectedTo, Cleanroom Operations>
+<Injectable Drug Manufacturing, connectedTo, Clinical Trial Phases>
+<Injectable Drug Manufacturing, connectedTo, Drug Research>
+<Injectable Drug Manufacturing, connectedTo, Supply Chain Management>
+<Intellectual Property Litigation, connectedTo, Packaging>
+<Intellectual Property Litigation, partOf, Intellectual Property Litigation>
+<Manufacturing Scale_up, connectedTo, Clinical Data Management>
+<Manufacturing Scale_up, inspects, Biostatistics>
+<Market Access Strategy, connectedTo, Injectable Drug Manufacturing>
+<Packaging, connectedTo, Quality Control>
+<Packaging, partOf, Packaging>
+<Patent Application, connectedTo, Process Validation>
+<Patient Adherence Programs, connectedTo, Manufacturing Scale_up>
+<Process Validation, connectedTo, Drug Research>
+<Quality Control, connectedTo, Drug Stability Testing>
+<Regulatory Approval, partOf, Regulatory Approval>
+<Regulatory Approval, tests, Drug Stability Testing>
+<Sales and Marketing Strategy, advises, Distribution>
diff --git a/test/graphviz/scanned_medium/graphviz_267.dot b/test/graphviz/scanned_medium/graphviz_267.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7007171d298241566a81ee33a62e8164fd731e5a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_267.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Path Planning" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N1 [label="Field Deployment" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N2 [label="Collaborative Robotics" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N3 [label="Ethical Robotics Development" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+	N4 [label="Kinematics and Dynamics" color="#FFC085" fillcolor="#FFDAB9" shape=octagon style=filled]
+	N5 [label="Software Development" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N6 [label="Drone Control" color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N7 [label="Data Collection" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N8 [label="Swarm Robotics" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N9 [label="Service Robotics" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N10 [label=Calibration color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	S0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFC085" fillcolor="#FFDAB9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Artificial Intelligence Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Force Control" color="#FFC085" fillcolor="#FFDAB9" shape=hexagon style=filled]
+		nest0_1 [label="Exploration Robotics" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+		nest0_2 [label="Exoskeleton Development" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+		nest0_3 [label="Learning Algorithms" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Embedded Systems Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Robot Assembly" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+		nest1_1 [label="Robot Fleet Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=plaintext style=filled]
+		nest1_2 [label="Performance Testing" color="#FFC085" fillcolor="#FFDAB9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=grips color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N1 [label=controls color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S0 -> N4 [label=disassembles color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_267.txt b/test/graphviz/scanned_medium/graphviz_267.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0fc70ad40bb26534f65b0f846578bcbb4e340dc4
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_267.txt
@@ -0,0 +1,35 @@
+<Collaborative Robotics, connectedTo, Ethical Robotics Development>
+<Data Collection, connectedTo, Swarm Robotics>
+<Drone Control, connectedTo, Calibration>
+<Drone Control, connectedTo, Data Collection>
+<Drone Control, connectedTo, Service Robotics>
+<Ethical Robotics Development, connectedTo, Kinematics and Dynamics>
+<Exoskeleton Development, connectedTo, Learning Algorithms>
+<Exoskeleton Development, partOf, Exoskeleton Development>
+<Exploration Robotics, connectedTo, Exoskeleton Development>
+<Exploration Robotics, partOf, Exploration Robotics>
+<Field Deployment, connectedTo, Collaborative Robotics>
+<Field Deployment, connectedTo, Drone Control>
+<Field Deployment, connectedTo, Software Development>
+<Field Deployment, connectedTo, Swarm Robotics>
+<Force Control, connectedTo, Exploration Robotics>
+<Force Control, partOf, Force Control>
+<Kinematics and Dynamics, connectedTo, Force Control>
+<Kinematics and Dynamics, connectedTo, Software Development>
+<Learning Algorithms, connectedTo, Software Development>
+<Learning Algorithms, partOf, Learning Algorithms>
+<Path Planning, connectedTo, Drone Control>
+<Path Planning, connectedTo, Software Development>
+<Path Planning, connectedTo, Swarm Robotics>
+<Path Planning, disassembles, Kinematics and Dynamics>
+<Path Planning, grips, Field Deployment>
+<Performance Testing, controls, Field Deployment>
+<Performance Testing, partOf, Performance Testing>
+<Robot Assembly, connectedTo, Robot Fleet Management>
+<Robot Assembly, partOf, Robot Assembly>
+<Robot Fleet Management, connectedTo, Performance Testing>
+<Robot Fleet Management, partOf, Robot Fleet Management>
+<Service Robotics, connectedTo, Calibration>
+<Service Robotics, connectedTo, Robot Assembly>
+<Software Development, connectedTo, Drone Control>
+<Swarm Robotics, connectedTo, Service Robotics>
diff --git a/test/graphviz/scanned_medium/graphviz_268.dot b/test/graphviz/scanned_medium/graphviz_268.dot
new file mode 100644
index 0000000000000000000000000000000000000000..acadc2fa574c089b6a1c5742e5294efc022f5d12
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_268.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=RL
+	N0 [label=Tunneling color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N1 [label="Concrete Pouring" color="#AB47BC" fillcolor="#F3E5F5" shape=parallelogram style=filled]
+	N2 [label="Structural Framing" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+	N3 [label="Bridge Building" color="#B8C0F5" fillcolor="#ECF0FD" shape=oval style=filled]
+	N4 [label="Site Decontamination" color="#42A5F5" fillcolor="#F1F8FF" shape=parallelogram style=filled]
+	N5 [label="Steel Erection" color="#AB47BC" fillcolor="#F3E5F5" shape=oval style=filled]
+	N6 [label="Permit Application" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+	N7 [label="Electrical Wiring" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N8 [label="Road Construction" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+	N9 [label=Excavation color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	N10 [label="Quality Assurance" color="#42A5F5" fillcolor="#F1F8FF" shape=Mdiamond style=filled]
+	N11 [label="Site Logistics" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+	N12 [label="Facade Installation" color="#AB47BC" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N13 [label="Foundation Laying" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N14 [label="Punch List Completion" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N15 [label="Plumbing Work" color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N16 [label="Utility Connection" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N17 [label="Budget Tracking" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	S0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Equipment Mobilization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Change Order Management" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+		nest0_1 [label="Robotics in Construction" color="#B8C0F5" fillcolor="#ECF0FD" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Subcontractor Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="BIM Modeling" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+		nest1_1 [label="Safety Inspection" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [label=grades color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N13 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest1_0 [label=coordinates color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N12 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N13 -> S0 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N16 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	S0 -> N17 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N17 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N14 -> N17 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest0_1 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_268.txt b/test/graphviz/scanned_medium/graphviz_268.txt
new file mode 100644
index 0000000000000000000000000000000000000000..dfc5cbcf4636131f37b201a1ce06d5c9b3486606
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_268.txt
@@ -0,0 +1,34 @@
+<BIM Modeling, connectedTo, Safety Inspection>
+<BIM Modeling, partOf, BIM Modeling>
+<Bridge Building, connectedTo, Site Decontamination>
+<Change Order Management, connectedTo, Robotics in Construction>
+<Change Order Management, partOf, Change Order Management>
+<Concrete Pouring, connectedTo, Structural Framing>
+<Electrical Wiring, connectedTo, Road Construction>
+<Excavation, connectedTo, Budget Tracking>
+<Excavation, connectedTo, Foundation Laying>
+<Excavation, connectedTo, Quality Assurance>
+<Facade Installation, connectedTo, Foundation Laying>
+<Foundation Laying, connectedTo, Budget Tracking>
+<Foundation Laying, connectedTo, Plumbing Work>
+<Foundation Laying, connectedTo, Punch List Completion>
+<Foundation Laying, connectedTo, Utility Connection>
+<Permit Application, connectedTo, Electrical Wiring>
+<Plumbing Work, connectedTo, Utility Connection>
+<Punch List Completion, connectedTo, Budget Tracking>
+<Punch List Completion, connectedTo, Plumbing Work>
+<Quality Assurance, connectedTo, Site Logistics>
+<Road Construction, connectedTo, Excavation>
+<Road Construction, connectedTo, Robotics in Construction>
+<Robotics in Construction, connectedTo, Foundation Laying>
+<Robotics in Construction, partOf, Robotics in Construction>
+<Safety Inspection, connectedTo, Facade Installation>
+<Safety Inspection, partOf, Safety Inspection>
+<Site Decontamination, connectedTo, Change Order Management>
+<Site Decontamination, connectedTo, Steel Erection>
+<Site Logistics, connectedTo, Facade Installation>
+<Steel Erection, connectedTo, Permit Application>
+<Steel Erection, coordinates, BIM Modeling>
+<Structural Framing, connectedTo, Bridge Building>
+<Tunneling, connectedTo, Concrete Pouring>
+<Utility Connection, grades, Budget Tracking>
diff --git a/test/graphviz/scanned_medium/graphviz_271.dot b/test/graphviz/scanned_medium/graphviz_271.dot
new file mode 100644
index 0000000000000000000000000000000000000000..adda5c2dd48896f33fa35bf2e586330ed31ba1ed
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_271.dot
@@ -0,0 +1,83 @@
+digraph {
+	rankdir=RL
+	N0 [label="Accessibility in Sports Venues" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label="Athlete Nutrition Planning" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N2 [label="Match Play" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N3 [label="Game Strategy" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N4 [label="Stadium Operations" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N5 [label="League Management" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N6 [label="Sports Psychology" color="#DCE775" fillcolor="#FCFCE7" shape=hexagon style=filled]
+	N7 [label="Anti_Doping Control" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N8 [label="Sports Analytics" color="#DCE775" fillcolor="#FCFCE7" shape=Mdiamond style=filled]
+	N9 [label="Player Recruitment" color="#7E57C2" fillcolor="#D1C4E9" shape=plaintext style=filled]
+	N10 [label="Athlete Brand Management" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N11 [label="Tournament Organization" color="#7E57C2" fillcolor="#D1C4E9" shape=oval style=filled]
+	N12 [label=Scorekeeping color="#DCE775" fillcolor="#FCFCE7" shape=plaintext style=filled]
+	N13 [label="Youth Development Programs" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N14 [label="Fan Engagement" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N15 [label="Talent Scouting" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N16 [label="Athlete Performance Tracking" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N17 [label="Sports Marketing" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+	N18 [label="Team Management" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#3F51B5" fillcolor="#C5CAE9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Media Rights Negotiation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Injury Management" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+		nest0_1 [label="Sponsorship Management" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Training Session" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Coaching color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest1_1 [label="Sports Technology Integration" color="#DCE775" fillcolor="#FCFCE7" shape=Mdiamond style=filled]
+		nest1_2 [label="Esports Event Management" color="#3F51B5" fillcolor="#C5CAE9" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest0_0 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N17 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N15 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N6 -> S2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N15 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_273.txt b/test/graphviz/scanned_medium/graphviz_273.txt
new file mode 100644
index 0000000000000000000000000000000000000000..398711c0b37d8b62f4abc94670dffa8d4b059d58
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_273.txt
@@ -0,0 +1,40 @@
+<Compliance Management, connectedTo, Recruitment Planning>
+<Compliance Management, partOf, Compliance Management>
+<Conflict Resolution, connectedTo, Employee Relations>
+<Diversity and Inclusion Initiatives, connectedTo, Performance Appraisal>
+<Employee Handbook Creation, connectedTo, Recruitment Planning>
+<Employee Handbook Creation, terminates, Remote Work Policy>
+<Employee Recognition Programs, connectedTo, Conflict Resolution>
+<Employee Training, compensates, Employee Relations>
+<Employee Training, connectedTo, Diversity and Inclusion Initiatives>
+<Employee Training, connectedTo, HR Information System Implementation>
+<Exit Interviews, connectedTo, Organizational Development>
+<Grievance Handling, connectedTo, Wellness Programs>
+<HR Analytics, connectedTo, Employee Handbook Creation>
+<HR Analytics, connectedTo, Exit Interviews>
+<HR Analytics, connectedTo, Job Posting>
+<HR Analytics, connectedTo, Organizational Development>
+<HR Analytics, hires, Onboarding Process>
+<HR Budgeting, develops, HR Analytics>
+<HR Information System Implementation, connectedTo, HR Policy Development>
+<HR Information System Implementation, partOf, HR Information System Implementation>
+<HR Policy Development, connectedTo, Offer Management>
+<HR Policy Development, partOf, HR Policy Development>
+<Interview Scheduling, connectedTo, Diversity and Inclusion Initiatives>
+<Interview Scheduling, reports, Team Building Activities>
+<Job Posting, connectedTo, Grievance Handling>
+<Leave Management, connectedTo, Employee Handbook Creation>
+<Offer Management, connectedTo, Work_Life Balance Initiatives>
+<Offer Management, partOf, Offer Management>
+<Onboarding Process, connectedTo, Work_Life Balance Initiatives>
+<Organizational Development, connectedTo, Leave Management>
+<Performance Appraisal, connectedTo, Employee Relations>
+<Performance Appraisal, connectedTo, HR Budgeting>
+<Recruitment Planning, connectedTo, Employee Recognition Programs>
+<Remote Work Policy, connectedTo, Compliance Management>
+<Remote Work Policy, partOf, Remote Work Policy>
+<Team Building Activities, connectedTo, Employee Training>
+<Team Building Activities, onboards, Diversity and Inclusion Initiatives>
+<Wellness Programs, connectedTo, Employee Relations>
+<Wellness Programs, connectedTo, Exit Interviews>
+<Work_Life Balance Initiatives, connectedTo, Job Posting>
diff --git a/test/graphviz/scanned_medium/graphviz_274.dot b/test/graphviz/scanned_medium/graphviz_274.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9e0efb1f7848f601df85beb63ae717ef1c281f4e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_274.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Candidate Screening" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Campus Recruitment" color="#CB9BE1" fillcolor="#F2E6F5" shape=Mdiamond style=filled]
+	N2 [label=Negotiation color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N3 [label="Candidate Experience Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N4 [label="Video Interviewing" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N5 [label="Applicant Tracking System Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N6 [label="Compliance in Hiring" color="#CB9BE1" fillcolor="#F2E6F5" shape=folder style=filled]
+	N7 [label="AI in Recruitment" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N8 [label="Talent Pipeline Building" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N9 [label="Temporary Staffing" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N10 [label="Reference Checking" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N11 [label="Recruitment Metrics Reporting" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	S0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CB9BE1" fillcolor="#F2E6F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Candidate Relationship Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Passive Candidate Engagement" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+		nest0_1 [label="Recruitment Marketing" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+		nest0_2 [label="Offer Extension" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Freelancer Engagement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Background Check" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+		nest1_1 [label=Headhunting color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=posts color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=regulates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N7 [label=protects color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N7 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_275.txt b/test/graphviz/scanned_medium/graphviz_275.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5f954388d4d3ad4a8984dc5a4a2b24e448a02197
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_275.txt
@@ -0,0 +1,38 @@
+<Accessibility Support, connectedTo, Feedback Loop to Product Development>
+<Account Management, connectedTo, Virtual Assistant Interaction>
+<Call Center Management, connectedTo, Knowledge Base Creation>
+<Complaint Resolution, connectedTo, Technical Support>
+<Complaint Resolution, partOf, Complaint Resolution>
+<Customer Journey Mapping, connectedTo, Personalized Assistance>
+<Customer Onboarding Support, engages, Service Level Agreement Monitoring>
+<Customer Onboarding Support, partOf, Customer Onboarding Support>
+<Customer Satisfaction Survey, connectedTo, Complaint Resolution>
+<Customer Satisfaction Survey, connectedTo, Service Blueprinting>
+<Customer Satisfaction Survey, connectedTo, Service Level Agreement Monitoring>
+<Customer Satisfaction Survey, connectedTo, Social Media Response>
+<Feedback Collection, connectedTo, Refund Processing>
+<Feedback Loop to Product Development, connectedTo, Call Center Management>
+<Inquiry Handling, connectedTo, Proactive Communication>
+<Inquiry Handling, partOf, Inquiry Handling>
+<Knowledge Base Creation, connectedTo, Feedback Collection>
+<Multilingual Support, connectedTo, Social Media Response>
+<Personalized Assistance, connectedTo, Accessibility Support>
+<Personalized Assistance, connectedTo, Multilingual Support>
+<Personalized Assistance, connectedTo, Service Blueprinting>
+<Personalized Assistance, empathizes, Proactive Communication>
+<Proactive Communication, connectedTo, Service Blueprinting>
+<Service Blueprinting, connectedTo, Accessibility Support>
+<Service Level Agreement Monitoring, connectedTo, Account Management>
+<Service Recovery, connectedTo, Customer Onboarding Support>
+<Service Recovery, partOf, Service Recovery>
+<Social Media Response, connectedTo, Proactive Communication>
+<Technical Support, connectedTo, Inquiry Handling>
+<Technical Support, partOf, Technical Support>
+<Training Customer Service Agents, connectedTo, Service Recovery>
+<Training Customer Service Agents, troubleshoots, Customer Satisfaction Survey>
+<Up_selling Opportunities, connectedTo, Service Blueprinting>
+<Up_selling Opportunities, connectedTo, Social Media Response>
+<Up_selling Opportunities, connectedTo, Training Customer Service Agents>
+<Virtual Assistant Interaction, connectedTo, Multilingual Support>
+<Virtual Assistant Interaction, connectedTo, Service Blueprinting>
+<Virtual Assistant Interaction, retains, Customer Journey Mapping>
diff --git a/test/graphviz/scanned_medium/graphviz_276.dot b/test/graphviz/scanned_medium/graphviz_276.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3260e5715b698378c3883ccf7bfc9de055cf7c01
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_276.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=BT
+	N0 [label="Supplier Relationship Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N1 [label="Vendor Managed Inventory" color="#03A9F4" fillcolor="#B3E5FC" shape=plaintext style=filled]
+	N2 [label="Distribution Network Design" color="#03A9F4" fillcolor="#B3E5FC" shape=Mdiamond style=filled]
+	N3 [label="Resilience Planning" color="#FFB2A5" fillcolor="#FFDCD6" shape=octagon style=filled]
+	N4 [label="Material Flow Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N5 [label="Digital Twin of Supply Chain" color="#03A9F4" fillcolor="#B3E5FC" shape=parallelogram style=filled]
+	N6 [label="Circular Economy Practices" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+	N7 [label=Procurement color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N8 [label=Warehousing color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N9 [label="Supply Chain Finance" color="#FFB2A5" fillcolor="#FFDCD6" shape=oval style=filled]
+	N10 [label="Collaborative Planning" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	N11 [label="Contract Manufacturing Oversight" color="#03A9F4" fillcolor="#B3E5FC" shape=ellipse style=filled]
+	N12 [label="Customs Compliance" color="#4FC3F7" fillcolor="#E1F5FE" shape=hexagon style=filled]
+	N13 [label="Demand Planning" color="#03A9F4" fillcolor="#B3E5FC" shape=oval style=filled]
+	N14 [label="Data Analytics for Supply Chain" color="#03A9F4" fillcolor="#B3E5FC" shape=hexagon style=filled]
+	N15 [label="Warehouse Automation" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+	N16 [label="Intermodal Transportation" color="#FFB2A5" fillcolor="#FFDCD6" shape=box style=filled]
+	N17 [label="Risk Management" color="#FFB2A5" fillcolor="#FFDCD6" shape=diamond style=filled]
+	N18 [label="Cold Chain Logistics" color="#4FC3F7" fillcolor="#E1F5FE" shape=ellipse style=filled]
+	S0 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4FC3F7" fillcolor="#E1F5FE" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#03A9F4" fillcolor="#B3E5FC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Production Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Inventory Management" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest0_1 [label="Risk Mitigation Strategies" color="#03A9F4" fillcolor="#B3E5FC" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Supplier Selection" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Supply Chain Visibility" color="#03A9F4" fillcolor="#B3E5FC" shape=box style=filled]
+		nest1_1 [label="Predictive Analytics" color="#4FC3F7" fillcolor="#E1F5FE" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [label=regulates color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#03A9F4" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N18 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [label=risk color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [label=negotiates color="#03A9F4" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N18 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [label=secures color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N7 -> S1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N13 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	S1 -> N16 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N18 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#4FC3F7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#4FC3F7" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_277.txt b/test/graphviz/scanned_medium/graphviz_277.txt
new file mode 100644
index 0000000000000000000000000000000000000000..858569a96d191e470f217e80bb859bd9a6660037
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_277.txt
@@ -0,0 +1,34 @@
+<Autonomous Haulage Systems, connectedTo, Mineral Processing>
+<Autonomous Haulage Systems, partOf, Autonomous Haulage Systems>
+<Community Relations, connectedTo, Exploration Drilling>
+<Community Relations, connectedTo, Robotics in Mining>
+<Drilling and Blasting, connectedTo, Exploration Drilling>
+<Drilling and Blasting, connectedTo, Feasibility Study>
+<Drilling and Blasting, connectedTo, Product Marketing>
+<Emergency Response Planning, connectedTo, Ore Extraction>
+<Emergency Response Planning, partOf, Emergency Response Planning>
+<Exploration, connectedTo, Refining>
+<Exploration, connectedTo, Robotics in Mining>
+<Exploration, connectedTo, Water Management>
+<Exploration Drilling, connectedTo, Reclamation>
+<Exploration Drilling, connectedTo, Robotics in Mining>
+<Feasibility Study, connectedTo, Exploration Drilling>
+<Feasibility Study, connectedTo, Ore Sorting>
+<Mine Planning, connectedTo, Drilling and Blasting>
+<Mine Planning, connectedTo, Exploration Drilling>
+<Mine Planning, connectedTo, Feasibility Study>
+<Mine Planning, connectedTo, Robotics in Mining>
+<Mine Planning, maintains, Exploration>
+<Mineral Processing, connectedTo, Robotics in Mining>
+<Mineral Processing, partOf, Mineral Processing>
+<Noise Management, connectedTo, Emergency Response Planning>
+<Noise Management, partOf, Noise Management>
+<Ore Extraction, connectedTo, Exploration>
+<Ore Sorting, connectedTo, Exploration Drilling>
+<Ore Sorting, grinds, Community Relations>
+<Product Marketing, connectedTo, Noise Management>
+<Product Marketing, partOf, Product Marketing>
+<Reclamation, connectedTo, Autonomous Haulage Systems>
+<Reclamation, connectedTo, Ore Extraction>
+<Refining, connectedTo, Robotics in Mining>
+<Robotics in Mining, connectedTo, Water Management>
diff --git a/test/graphviz/scanned_medium/graphviz_278.dot b/test/graphviz/scanned_medium/graphviz_278.dot
new file mode 100644
index 0000000000000000000000000000000000000000..07803040de6e8365b0848de1968c780be8a57b50
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_278.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=RL
+	N0 [label=Navigation color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N1 [label="Cargo Loading" color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+	N2 [label="Fuel Consumption Optimization" color="#388E3C" fillcolor="#F1F8E9" shape=oval style=filled]
+	N3 [label="Port Operations" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N4 [label="Vessel Maintenance" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N5 [label="Customs Clearance" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N6 [label="Hydrographic Surveying" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N7 [label="Search and Rescue Coordination" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N8 [label="Offshore Operations" color="#AF56A6" fillcolor="#DDCEDD" shape=folder style=filled]
+	N9 [label="Freight Forwarding" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N10 [label="Fisheries Management" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#388E3C" fillcolor="#F1F8E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Route Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Marine Insurance" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+		nest0_1 [label="Port Congestion Management" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Inland Waterway Transport" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Crew Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+		nest1_1 [label="Green Shipping Initiatives" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest1_2 [label="Ship Registry" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+		nest1_3 [label="Terminal Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=diamond style=filled]
+		nest1_0 -> nest1_1 [label=tracks color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest1_0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> S2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N3 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	M0 -> N8 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [label=supplies color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_279.txt b/test/graphviz/scanned_medium/graphviz_279.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4f46c8520714c0496a4e59a14c09ea435e6d0d57
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_279.txt
@@ -0,0 +1,33 @@
+<Autonomous Rendezvous and Docking, connectedTo, Commercial Space Flight Regulation>
+<Autonomous Rendezvous and Docking, connectedTo, International Collaboration>
+<Autonomous Rendezvous and Docking, connectedTo, Launch Operations>
+<Autonomous Rendezvous and Docking, connectedTo, Sample Return Missions>
+<Commercial Space Flight Regulation, designs, Orbital Mechanics>
+<Deep Space Communications, connectedTo, Lunar Exploration>
+<Extravehicular Activity Planning, connectedTo, Ground Station Operations>
+<Extravehicular Activity Planning, connectedTo, Rocket Propulsion Development>
+<Ground Station Operations, connectedTo, Robotics for Space Exploration>
+<Ground Station Operations, partOf, Ground Station Operations>
+<International Collaboration, connectedTo, Launch Operations>
+<Launch Operations, connectedTo, Commercial Space Flight Regulation>
+<Lunar Exploration, connectedTo, Extravehicular Activity Planning>
+<Lunar Exploration, connectedTo, Launch Operations>
+<New Space Technology Development, connectedTo, Space Station Operations>
+<Planetary Science Research, connectedTo, International Collaboration>
+<Planetary Science Research, partOf, Planetary Science Research>
+<Robotics for Space Exploration, connectedTo, Orbital Mechanics>
+<Robotics for Space Exploration, partOf, Robotics for Space Exploration>
+<Rocket Propulsion Development, connectedTo, Launch Operations>
+<Rocket Propulsion Development, connectedTo, New Space Technology Development>
+<Sample Return Missions, connectedTo, Commercial Space Flight Regulation>
+<Sample Return Missions, connectedTo, International Collaboration>
+<Sample Return Missions, connectedTo, Launch Operations>
+<Sample Return Missions, connectedTo, Orbital Mechanics>
+<Sample Return Missions, connectedTo, Space Debris Mitigation>
+<Space Debris Mitigation, connectedTo, Telemetry Monitoring>
+<Space Debris Mitigation, partOf, Space Debris Mitigation>
+<Space Station Operations, connectedTo, Autonomous Rendezvous and Docking>
+<Space Weather Forecasting, connectedTo, Planetary Science Research>
+<Space Weather Forecasting, partOf, Space Weather Forecasting>
+<Telemetry Monitoring, partOf, Telemetry Monitoring>
+<Telemetry Monitoring, warns, Space Weather Forecasting>
diff --git a/test/graphviz/scanned_medium/graphviz_28.dot b/test/graphviz/scanned_medium/graphviz_28.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7eba9cbea557973525c0f44fa5090c0a87b3b5e3
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_28.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=BT
+	N0 [label="Site Planning" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N1 [label="HVAC Installation" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N2 [label="Steel Erection" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N3 [label="Safety Inspection" color="#CD8FF2" fillcolor="#ECCFF5" shape=oval style=filled]
+	N4 [label="Equipment Mobilization" color="#CD8FF2" fillcolor="#ECCFF5" shape=plaintext style=filled]
+	N5 [label="Concrete Pouring" color="#66BB6A" fillcolor="#E8F5E9" shape=hexagon style=filled]
+	N6 [label="Sustainable Building Design" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N7 [label="Quality Assurance" color="#6FE1D5" fillcolor="#C9EFEC" shape=oval style=filled]
+	N8 [label="Facade Installation" color="#6FE1D5" fillcolor="#C9EFEC" shape=hexagon style=filled]
+	N9 [label="Post_Construction Handover" color="#66BB6A" fillcolor="#E8F5E9" shape=ellipse style=filled]
+	N0 -> N1 [label=frames color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=safety color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#66BB6A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=documents color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=repairs color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N8 [label=installs color="#66BB6A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_28.txt b/test/graphviz/scanned_medium/graphviz_28.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f4589809e3bab8bcd8df444a511957abe438294e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_28.txt
@@ -0,0 +1,10 @@
+<Concrete Pouring, connectedTo, Sustainable Building Design>
+<Equipment Mobilization, connectedTo, Concrete Pouring>
+<Equipment Mobilization, installs, Facade Installation>
+<Facade Installation, repairs, Post_Construction Handover>
+<HVAC Installation, connectedTo, Steel Erection>
+<Quality Assurance, documents, Facade Installation>
+<Safety Inspection, connectedTo, Equipment Mobilization>
+<Site Planning, frames, HVAC Installation>
+<Steel Erection, safety, Safety Inspection>
+<Sustainable Building Design, connectedTo, Quality Assurance>
diff --git a/test/graphviz/scanned_medium/graphviz_280.txt b/test/graphviz/scanned_medium/graphviz_280.txt
new file mode 100644
index 0000000000000000000000000000000000000000..47f6ce5ad043b4fde342220b69eb30b62adf2a17
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_280.txt
@@ -0,0 +1,27 @@
+<Adaptation Strategy Development, connectedTo, Climate Education Programs>
+<Adaptation Strategy Development, partOf, Adaptation Strategy Development>
+<Arctic and Antarctic Research, connectedTo, Atmospheric Monitoring>
+<Atmospheric Monitoring, connectedTo, Ecological Footprint Calculation>
+<Atmospheric Monitoring, connectedTo, Ocean Acidification Studies>
+<Atmospheric Monitoring, connectedTo, Water Resource Management under Climate Change>
+<Climate Education Programs, connectedTo, Remote Sensing for Climate>
+<Cloud Formation Research, connectedTo, Ecological Footprint Calculation>
+<Data Collection, connectedTo, Green Technology Incubation>
+<Data Collection, partOf, Data Collection>
+<Drought Monitoring and Forecasting, connectedTo, Renewable Energy Potential Assessment>
+<Drought Monitoring and Forecasting, partOf, Drought Monitoring and Forecasting>
+<Ecological Footprint Calculation, connectedTo, Climate Education Programs>
+<Ecological Footprint Calculation, connectedTo, Data Collection>
+<Ecological Footprint Calculation, connectedTo, Greenhouse Gas Measurement>
+<Ecological Footprint Calculation, connectedTo, Renewable Energy Potential Assessment>
+<Green Technology Incubation, connectedTo, Adaptation Strategy Development>
+<Green Technology Incubation, partOf, Green Technology Incubation>
+<Greenhouse Gas Measurement, connectedTo, Climate Education Programs>
+<Ocean Acidification Studies, connectedTo, Drought Monitoring and Forecasting>
+<Ocean Acidification Studies, partOf, Ocean Acidification Studies>
+<Remote Sensing for Climate, connectedTo, Aerosol Impact Assessment>
+<Renewable Energy Potential Assessment, connectedTo, Aerosol Impact Assessment>
+<Renewable Energy Potential Assessment, connectedTo, Climate Education Programs>
+<Renewable Energy Potential Assessment, connectedTo, Greenhouse Gas Measurement>
+<Water Resource Management under Climate Change, connectedTo, Cloud Formation Research>
+<Water Resource Management under Climate Change, connectedTo, Ecological Footprint Calculation>
diff --git a/test/graphviz/scanned_medium/graphviz_284.dot b/test/graphviz/scanned_medium/graphviz_284.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1de45313d2d884799c3e42aae51a6be3e90d7fa4
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_284.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=BT
+	N0 [label="Life Cycle Assessment" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N1 [label="Glass Recycling" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N2 [label="Deposit_Return Schemes" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N3 [label="Public Recycling Programs" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N4 [label="Product Design for Recyclability" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N5 [label="Paper Recycling" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+	N6 [label="Recycling Policy Advocacy" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N7 [label="Closed_Loop Material Flow" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N8 [label="Material Collection" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N9 [label="Mechanical Recycling" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N10 [label="Plastic Recycling" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Collection Point Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Waste Audit for Recycling" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest0_1 [label="Metal Recycling" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_2 [label="Circular Economy Implementation" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=reduces color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Construction Waste Recycling" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Tyre Recycling" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest1_1 [label="Commercial Recycling Solutions" color="#C2B2F0" fillcolor="#EFE6FF" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=treats color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	nest0_2 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest1_0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M2 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_284.txt b/test/graphviz/scanned_medium/graphviz_284.txt
new file mode 100644
index 0000000000000000000000000000000000000000..010c89beb17ddcd625f855e22e073f03295a9659
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_284.txt
@@ -0,0 +1,32 @@
+<Circular Economy Implementation, connectedTo, Closed_Loop Material Flow>
+<Circular Economy Implementation, partOf, Circular Economy Implementation>
+<Closed_Loop Material Flow, connectedTo, Material Collection>
+<Commercial Recycling Solutions, connectedTo, Deposit_Return Schemes>
+<Commercial Recycling Solutions, partOf, Commercial Recycling Solutions>
+<Deposit_Return Schemes, connectedTo, Closed_Loop Material Flow>
+<Deposit_Return Schemes, connectedTo, Paper Recycling>
+<Deposit_Return Schemes, connectedTo, Recycling Policy Advocacy>
+<Deposit_Return Schemes, connectedTo, Waste Audit for Recycling>
+<Deposit_Return Schemes, treats, Public Recycling Programs>
+<Glass Recycling, connectedTo, Deposit_Return Schemes>
+<Glass Recycling, connectedTo, Product Design for Recyclability>
+<Glass Recycling, connectedTo, Public Recycling Programs>
+<Life Cycle Assessment, connectedTo, Glass Recycling>
+<Material Collection, connectedTo, Mechanical Recycling>
+<Mechanical Recycling, connectedTo, Plastic Recycling>
+<Metal Recycling, partOf, Metal Recycling>
+<Metal Recycling, reduces, Circular Economy Implementation>
+<Paper Recycling, connectedTo, Closed_Loop Material Flow>
+<Paper Recycling, connectedTo, Mechanical Recycling>
+<Paper Recycling, connectedTo, Plastic Recycling>
+<Paper Recycling, connectedTo, Recycling Policy Advocacy>
+<Product Design for Recyclability, connectedTo, Closed_Loop Material Flow>
+<Product Design for Recyclability, connectedTo, Paper Recycling>
+<Public Recycling Programs, connectedTo, Paper Recycling>
+<Public Recycling Programs, connectedTo, Product Design for Recyclability>
+<Public Recycling Programs, connectedTo, Tyre Recycling>
+<Recycling Policy Advocacy, connectedTo, Closed_Loop Material Flow>
+<Tyre Recycling, connectedTo, Commercial Recycling Solutions>
+<Tyre Recycling, partOf, Tyre Recycling>
+<Waste Audit for Recycling, connectedTo, Metal Recycling>
+<Waste Audit for Recycling, partOf, Waste Audit for Recycling>
diff --git a/test/graphviz/scanned_medium/graphviz_286.dot b/test/graphviz/scanned_medium/graphviz_286.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d0b922a133948893a7111a1781d998094a8a0a16
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_286.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Euthanasia Services" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	N1 [label="Sterilization Protocols" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N2 [label="Animal Welfare Assessment" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N3 [label="Toxicology Testing" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N4 [label="Biosecurity Measures" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N5 [label="Pre_surgical Assessment" color="#FFCC80" fillcolor="#FFF0CC" shape=folder style=filled]
+	N6 [label="Reproductive Services" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N7 [label=Microchipping color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N8 [label="Post_operative Care" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+	S0 [label="" color="#FFCC80" fillcolor="#FFF0CC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Pain Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label=Prescription color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+		nest0_1 [label="Farm Animal Health Management" color="#A188DB" fillcolor="#DED7F0" shape=Mdiamond style=filled]
+		nest0_2 [label="Client Communication" color="#FFCC80" fillcolor="#FFF0CC" shape=hexagon style=filled]
+		nest0_3 [label="Wildlife Rehabilitation" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Public Health Vet Services" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Anesthesia Administration" color="#FFCC80" fillcolor="#FFF0CC" shape=ellipse style=filled]
+		nest1_1 [label="Livestock Disease Prevention" color="#92C79A" fillcolor="#E8F0EA" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [label=communicates color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=inspects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest0_0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N7 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N4 [label=shelters color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N3 -> S0 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N4 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [label=admits color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_286.txt b/test/graphviz/scanned_medium/graphviz_286.txt
new file mode 100644
index 0000000000000000000000000000000000000000..769c4f86fb14f3161e42dd2f42a0f21f88e544a1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_286.txt
@@ -0,0 +1,34 @@
+<Anesthesia Administration, communicates, Livestock Disease Prevention>
+<Anesthesia Administration, partOf, Anesthesia Administration>
+<Animal Welfare Assessment, admits, Pre_surgical Assessment>
+<Animal Welfare Assessment, connectedTo, Anesthesia Administration>
+<Animal Welfare Assessment, connectedTo, Toxicology Testing>
+<Biosecurity Measures, connectedTo, Pre_surgical Assessment>
+<Client Communication, connectedTo, Wildlife Rehabilitation>
+<Client Communication, partOf, Client Communication>
+<Euthanasia Services, connectedTo, Biosecurity Measures>
+<Euthanasia Services, connectedTo, Pre_surgical Assessment>
+<Euthanasia Services, connectedTo, Sterilization Protocols>
+<Euthanasia Services, connectedTo, Toxicology Testing>
+<Farm Animal Health Management, connectedTo, Client Communication>
+<Farm Animal Health Management, partOf, Farm Animal Health Management>
+<Livestock Disease Prevention, partOf, Livestock Disease Prevention>
+<Livestock Disease Prevention, shelters, Biosecurity Measures>
+<Microchipping, connectedTo, Post_operative Care>
+<Pre_surgical Assessment, connectedTo, Reproductive Services>
+<Prescription, connectedTo, Farm Animal Health Management>
+<Prescription, partOf, Prescription>
+<Reproductive Services, inspects, Microchipping>
+<Sterilization Protocols, connectedTo, Animal Welfare Assessment>
+<Sterilization Protocols, connectedTo, Biosecurity Measures>
+<Sterilization Protocols, connectedTo, Microchipping>
+<Sterilization Protocols, connectedTo, Pre_surgical Assessment>
+<Sterilization Protocols, connectedTo, Reproductive Services>
+<Sterilization Protocols, connectedTo, Toxicology Testing>
+<Toxicology Testing, connectedTo, Biosecurity Measures>
+<Toxicology Testing, connectedTo, Post_operative Care>
+<Toxicology Testing, connectedTo, Pre_surgical Assessment>
+<Toxicology Testing, connectedTo, Prescription>
+<Toxicology Testing, connectedTo, Reproductive Services>
+<Wildlife Rehabilitation, connectedTo, Microchipping>
+<Wildlife Rehabilitation, partOf, Wildlife Rehabilitation>
diff --git a/test/graphviz/scanned_medium/graphviz_289.txt b/test/graphviz/scanned_medium/graphviz_289.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ca98de3c27d19ae0430d4cb5018593f5ddd9f497
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_289.txt
@@ -0,0 +1,41 @@
+<Capacity Building for Local Communities, connectedTo, Search and Rescue Operations>
+<Capacity Building for Local Communities, evaluates, Post_Disaster Evaluation>
+<Cash Transfer Programs, secures, Capacity Building for Local Communities>
+<Climate Change Adaptation for Disasters, connectedTo, Emergency Response>
+<Communication Protocols, distributes, Information Dissemination>
+<Communication Protocols, partOf, Communication Protocols>
+<Damage Assessment, connectedTo, Economic Recovery Initiatives>
+<Damage Assessment, connectedTo, Public Awareness Campaigns>
+<Drone Deployment for Assessment, connectedTo, Climate Change Adaptation for Disasters>
+<Drone Deployment for Assessment, connectedTo, Economic Recovery Initiatives>
+<Early Recovery Actions, connectedTo, Emergency Drills and Exercises>
+<Early Recovery Actions, partOf, Early Recovery Actions>
+<Economic Recovery Initiatives, warns, Cash Transfer Programs>
+<Emergency Drills and Exercises, connectedTo, Volunteer Coordination>
+<Emergency Drills and Exercises, partOf, Emergency Drills and Exercises>
+<Emergency Response, connectedTo, Policy and Legislation Review>
+<Environmental Remediation, connectedTo, Damage Assessment>
+<Environmental Remediation, connectedTo, Economic Recovery Initiatives>
+<Environmental Remediation, connectedTo, Infrastructure Repair>
+<Environmental Remediation, connectedTo, Post_Disaster Evaluation>
+<Environmental Remediation, connectedTo, Public Awareness Campaigns>
+<Evacuation Procedures, enforces, Shelter Management>
+<Evacuation Procedures, partOf, Evacuation Procedures>
+<Hazard Identification, connectedTo, Environmental Remediation>
+<Information Dissemination, connectedTo, Hazard Identification>
+<Infrastructure Repair, connectedTo, Damage Assessment>
+<Mitigation Strategies, connectedTo, Information Dissemination>
+<Policy and Legislation Review, connectedTo, Economic Recovery Initiatives>
+<Policy and Legislation Review, connectedTo, Post_Disaster Evaluation>
+<Policy and Legislation Review, connectedTo, Reconstruction>
+<Public Awareness Campaigns, connectedTo, Drone Deployment for Assessment>
+<Public Awareness Campaigns, connectedTo, Economic Recovery Initiatives>
+<Reconstruction, connectedTo, Resilience Building>
+<Reconstruction, connectedTo, Volunteer Coordination>
+<Resilience Building, connectedTo, Evacuation Procedures>
+<Resilience Building, partOf, Resilience Building>
+<Search and Rescue Operations, connectedTo, Early Recovery Actions>
+<Search and Rescue Operations, partOf, Search and Rescue Operations>
+<Shelter Management, connectedTo, Communication Protocols>
+<Shelter Management, partOf, Shelter Management>
+<Volunteer Coordination, connectedTo, Economic Recovery Initiatives>
diff --git a/test/graphviz/scanned_medium/graphviz_290.dot b/test/graphviz/scanned_medium/graphviz_290.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3a977ca7caf5fa4c6a1802594a6fcef318c492bd
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_290.dot
@@ -0,0 +1,70 @@
+digraph {
+	rankdir=LR
+	N0 [label="Counter_Insurgency Operations" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N1 [label="Medical Support" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+	N2 [label="Operations Planning" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N3 [label="Weapon Systems Development" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N4 [label=Targeting color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N5 [label="Veteran Support" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N6 [label="Equipment Maintenance" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N7 [label="Family Support Programs" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N8 [label="Combat Operations" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N9 [label=Demobilization color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N10 [label=Recruitment color="#26A69A" fillcolor="#E0F2F1" shape=oval style=filled]
+	N11 [label="Defense Procurement" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N12 [label="Logistics Support" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N13 [label="Ground Operations" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	S0 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#7E57C2" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Joint Exercises" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Crisis Management" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_1 [label="Cyber Warfare Operations" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest0_2 [label="Air Operations" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest0_3 [label="Personnel Management" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Military Strategy Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Reconnaissance color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest1_1 [label="Unmanned Systems Operation" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+		nest1_2 [label=Surveillance color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest1_3 [label="Peacekeeping Missions" color="#7E57C2" fillcolor="#D1C4E9" shape=folder style=filled]
+		nest1_0 -> nest1_1 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=secures color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [label=communicates color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N3 [label=coordinates color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest1_0 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N1 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	M1 -> N12 [color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [label=detains color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N12 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_292.dot b/test/graphviz/scanned_medium/graphviz_292.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a6e712ccce9646cf1b4a6cb7ed69b89009c09a98
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_292.dot
@@ -0,0 +1,82 @@
+digraph {
+	rankdir=RL
+	N0 [label=Geofencing color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N1 [label="Autonomous Vehicle Navigation" color="#FFE69C" fillcolor="#FFF9D4" shape=octagon style=filled]
+	N2 [label="Personalized Route Preferences" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+	N3 [label="Historical Traffic Data Analysis" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N4 [label="Cycle Route Planning" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N5 [label="Location_Based Services" color="#AF56A6" fillcolor="#DDCEDD" shape=octagon style=filled]
+	N6 [label="Altitude Tracking" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N7 [label="Wearable Device Navigation" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N8 [label="Inertial Navigation System" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N9 [label="Topographic Mapping" color="#FFE69C" fillcolor="#FFF9D4" shape=Mdiamond style=filled]
+	N10 [label="Real_Time Re_routing" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N11 [label="Indoor Navigation" color="#FFE69C" fillcolor="#FFF9D4" shape=ellipse style=filled]
+	N12 [label="Satellite Navigation Systems" color="#FFE69C" fillcolor="#FFF9D4" shape=oval style=filled]
+	N13 [label="Bearing and Distance Calculation" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N14 [label="Waypoint Setting" color="#FFE69C" fillcolor="#FFF9D4" shape=box style=filled]
+	N15 [label="GPS Positioning" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N16 [label="Speed Calculation" color="#FFE69C" fillcolor="#FFF9D4" shape=folder style=filled]
+	N17 [label="Offline Map Support" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#4DD0E1" fillcolor="#C9F0F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Digital Compass Integration" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Route Calculation" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest0_1 [label="Celestial Navigation" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+		nest0_2 [label="Lane Guidance" color="#FFE69C" fillcolor="#FFF9D4" shape=diamond style=filled]
+		nest0_3 [label="Hazard Alerts" color="#FFE69C" fillcolor="#FFF9D4" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [label=tracks color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="ETA Estimation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Marine Charting" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+		nest1_1 [label="Pedestrian Navigation" color="#AF56A6" fillcolor="#DDCEDD" shape=octagon style=filled]
+		nest1_2 [label="Traffic Information" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+		nest1_3 [label="Map Display" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N2 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest1_0 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	nest1_3 -> N16 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N17 [color="#FFE69C" dir=forward penwidth=1.5 style=solid]
+	N8 -> S1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#FFE69C" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N11 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N15 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M1 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_293.txt b/test/graphviz/scanned_medium/graphviz_293.txt
new file mode 100644
index 0000000000000000000000000000000000000000..328f730dec4a1cd75919ee97d452ee90be2ea75f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_293.txt
@@ -0,0 +1,43 @@
+<3D Model Design, connectedTo, Educational Applications>
+<3D Model Design, connectedTo, Prototyping>
+<3D Printed Tooling, connectedTo, Material Research and Development>
+<4D Printing, connectedTo, 3D Printed Tooling>
+<Additive Manufacturing, connectedTo, Rapid Manufacturing>
+<Aerospace Part Production, connectedTo, 4D Printing>
+<Aerospace Part Production, connectedTo, Multi_Material Printing>
+<Aerospace Part Production, connectedTo, Post_Processing>
+<Bioprinting, connectedTo, Educational Applications>
+<Bioprinting, connectedTo, Material Research and Development>
+<Bioprinting, connectedTo, Printing Process>
+<Bioprinting, scans, Additive Manufacturing>
+<Construction 3D Printing, connectedTo, Medical Device Prototyping>
+<Construction 3D Printing, partOf, Construction 3D Printing>
+<Consumer Product Creation, connectedTo, 4D Printing>
+<Consumer Product Creation, connectedTo, Bioprinting>
+<Digital Twin for 3D Prints, connectedTo, Direct Metal Laser Sintering>
+<Digital Twin for 3D Prints, connectedTo, Medical Device Prototyping>
+<Digital Twin for 3D Prints, connectedTo, Multi_Material Printing>
+<Digital Twin for 3D Prints, connectedTo, Rapid Manufacturing>
+<Educational Applications, connectedTo, Quality Control>
+<Food Printing, connectedTo, Digital Twin for 3D Prints>
+<Food Printing, partOf, Food Printing>
+<Intellectual Property Protection for Designs, connectedTo, Consumer Product Creation>
+<Material Research and Development, connectedTo, Additive Manufacturing>
+<Material Research and Development, connectedTo, Support Structure Design>
+<Medical Device Prototyping, connectedTo, Additive Manufacturing>
+<Multi_Material Printing, finishes, Direct Metal Laser Sintering>
+<On_Demand Production, connectedTo, 4D Printing>
+<On_Demand Production, connectedTo, Aerospace Part Production>
+<On_Demand Production, connectedTo, Multi_Material Printing>
+<Post_Processing, connectedTo, Food Printing>
+<Post_Processing, partOf, Post_Processing>
+<Printer Setup, connectedTo, 3D Model Design>
+<Printer Setup, connectedTo, Multi_Material Printing>
+<Printing Process, connectedTo, 4D Printing>
+<Printing Process, connectedTo, On_Demand Production>
+<Prototyping, connectedTo, Construction 3D Printing>
+<Prototyping, partOf, Prototyping>
+<Quality Control, connectedTo, Digital Twin for 3D Prints>
+<Rapid Manufacturing, connectedTo, Multi_Material Printing>
+<Slicing Software Operation, connectedTo, Intellectual Property Protection for Designs>
+<Support Structure Design, connectedTo, Printer Setup>
diff --git a/test/graphviz/scanned_medium/graphviz_294.dot b/test/graphviz/scanned_medium/graphviz_294.dot
new file mode 100644
index 0000000000000000000000000000000000000000..98b5ff377fe1188afac2762b8683e267df5d83c0
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_294.dot
@@ -0,0 +1,72 @@
+digraph {
+	rankdir=BT
+	N0 [label="Nanodevice Fabrication" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Regulatory Framework for Nanotech" color="#FFCC7A" fillcolor="#FFF6D9" shape=folder style=filled]
+	N2 [label="Scanning Electron Microscopy" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	N3 [label="Nanomedicine Development" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N4 [label="Bio_Nanotechnology Interface" color="#B8C0F5" fillcolor="#ECF0FD" shape=Mdiamond style=filled]
+	N5 [label="Food Packaging Improvement" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N6 [label=Spectroscopy color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N7 [label=Nanocoatings color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N8 [label="Nanomaterial Synthesis" color="#A2D0FF" fillcolor="#E8F0FF" shape=hexagon style=filled]
+	N9 [label="Quantum Computing Integration" color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+	N10 [label=Nanoelectronics color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+	N11 [label="X_ray Diffraction" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N12 [label="Catalysis at Nanoscale" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N13 [label="Computational Nanotechnology" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N14 [label="Drug Delivery Systems" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N15 [label=Biosensors color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N16 [label="Energy Storage Applications" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_0 [label="Carbon Nanotube Synthesis" color="#A2D0FF" fillcolor="#E8F0FF" shape=oval style=filled]
+		nest0_1 [label=Nanosensors color="#B8C0F5" fillcolor="#ECF0FD" shape=diamond style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Solar Cell Efficiency Enhancement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Atomic Force Microscopy" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+		nest1_1 [label=Photovoltaics color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [label=develops color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	}
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+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=designs color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=visualizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=characterizes color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [label=models color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N10 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N10 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [label=filters color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N9 -> S2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N14 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	M1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_297.txt b/test/graphviz/scanned_medium/graphviz_297.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7d8365dca7dbfd4cebdf7528af3a46a3a8f623cf
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_297.txt
@@ -0,0 +1,50 @@
+<Art Direction, connectedTo, Esports Event Organization>
+<Art Direction, connectedTo, Game Balancing>
+<Asset Creation, connectedTo, Art Direction>
+<Asset Creation, partOf, Asset Creation>
+<Augmented Reality Gaming, connectedTo, Narrative Design>
+<Bug Fixing, connectedTo, Player Progression Systems>
+<Bug Fixing, partOf, Bug Fixing>
+<Character Design, connectedTo, Network Code Optimization>
+<Community Management, connectedTo, Augmented Reality Gaming>
+<Engine Development, connectedTo, Game Publishing>
+<Engine Development, partOf, Engine Development>
+<Esports Event Organization, connectedTo, Voice Acting>
+<Esports Event Organization, partOf, Esports Event Organization>
+<Game Analytics, connectedTo, Localization>
+<Game Analytics, markets, Level Design>
+<Game Balancing, connectedTo, Community Management>
+<Game Balancing, connectedTo, Game Analytics>
+<Game Balancing, connectedTo, Level Design>
+<Game Balancing, connectedTo, Marketing and Promotion>
+<Game Balancing, connectedTo, Player Feedback Integration>
+<Game Balancing, manages, Narrative Design>
+<Game Publishing, connectedTo, Monetization Strategy>
+<Game Publishing, partOf, Game Publishing>
+<Level Design, connectedTo, Localization>
+<Level Design, connectedTo, Player Feedback Integration>
+<Marketing and Promotion, connectedTo, Augmented Reality Gaming>
+<Marketing and Promotion, tests, Community Management>
+<Monetization Strategy, connectedTo, Community Management>
+<Monetization Strategy, connectedTo, Level Design>
+<Monetization Strategy, connectedTo, Multiplayer Game Development>
+<Monetization Strategy, connectedTo, Network Code Optimization>
+<Monetization Strategy, connectedTo, Quality Assurance Testing>
+<Monetization Strategy, sponsors, Game Analytics>
+<Multiplayer Game Development, connectedTo, Character Design>
+<Narrative Design, connectedTo, Game Analytics>
+<Narrative Design, connectedTo, Localization>
+<Network Code Optimization, connectedTo, Art Direction>
+<Network Code Optimization, connectedTo, Augmented Reality Gaming>
+<Player Feedback Integration, connectedTo, Bug Fixing>
+<Player Feedback Integration, connectedTo, Localization>
+<Player Progression Systems, partOf, Player Progression Systems>
+<Player Progression Systems, scores, Engine Development>
+<Quality Assurance Testing, connectedTo, Marketing and Promotion>
+<Quality Assurance Testing, connectedTo, Player Feedback Integration>
+<Quality Assurance Testing, connectedTo, Storytelling>
+<Storytelling, engages, Multiplayer Game Development>
+<User Interface Design, connectedTo, Monetization Strategy>
+<User Interface Design, engineers, Augmented Reality Gaming>
+<Voice Acting, connectedTo, Asset Creation>
+<Voice Acting, partOf, Voice Acting>
diff --git a/test/graphviz/scanned_medium/graphviz_298.dot b/test/graphviz/scanned_medium/graphviz_298.dot
new file mode 100644
index 0000000000000000000000000000000000000000..284ceb44f20bb2f21813797fb7c603d513795fd0
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_298.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=BT
+	N0 [label="Vocal Performance" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N1 [label="Beat Making" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N2 [label="Royalty Collection" color="#B0C5CD" fillcolor="#DFE7EB" shape=oval style=filled]
+	N3 [label="Sound Design for Media" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+	N4 [label=Mastering color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N5 [label=Arrangement color="#673AB7" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N6 [label="Music Publishing" color="#673AB7" fillcolor="#D1C4E9" shape=octagon style=filled]
+	N7 [label="Digital Audio Workstation Operation" color="#673AB7" fillcolor="#D1C4E9" shape=Mdiamond style=filled]
+	N8 [label="Copyright Management" color="#DCE775" fillcolor="#FCFCE7" shape=plaintext style=filled]
+	N9 [label="Music Production" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N10 [label="Live Sound Engineering" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	N11 [label="Synthesizer Programming" color="#B0C5CD" fillcolor="#DFE7EB" shape=octagon style=filled]
+	N12 [label="Sound System Design" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N13 [label="Artist Management" color="#673AB7" fillcolor="#D1C4E9" shape=folder style=filled]
+	N14 [label="Music Distribution" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	S0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#DCE775" fillcolor="#FCFCE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Record Label Operations" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Lyric Writing" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+		nest0_1 [label="Music Education" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label=Composition labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Merchandise Sales" color="#DCE775" fillcolor="#FCFCE7" shape=diamond style=filled]
+		nest1_1 [label="Music Video Production" color="#673AB7" fillcolor="#D1C4E9" shape=hexagon style=filled]
+		nest1_2 [label="Streaming Platform Management" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+		nest1_3 [label="Instrumental Performance" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=masters color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=learns color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> nest0_0 [label=educates color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest1_0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N3 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N11 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [label=plays color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [label=transcribes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M2 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M2 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_299.dot b/test/graphviz/scanned_medium/graphviz_299.dot
new file mode 100644
index 0000000000000000000000000000000000000000..be17289bd2612eb48e4a6069b0927be36b07e46e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_299.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Script Development" color="#80DDEA" fillcolor="#D3F7F9" shape=ellipse style=filled]
+	N1 [label="Marketing and Publicity" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N2 [label="Green Production Practices" color="#FFF8A6" fillcolor="#FFFDE0" shape=hexagon style=filled]
+	N3 [label="Production Scheduling" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N4 [label=Storyboarding color="#80DDEA" fillcolor="#D3F7F9" shape=box style=filled]
+	N5 [label="Costume Design" color="#80DDEA" fillcolor="#D3F7F9" shape=Mdiamond style=filled]
+	N6 [label="Art Direction" color="#AF56A6" fillcolor="#DDCEDD" shape=diamond style=filled]
+	N7 [label="Insurance Management" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#80DDEA" fillcolor="#D3F7F9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Film Festival Submission" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Virtual Production Techniques" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest0_1 [label="Remote Collaboration Tools" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Pre_production Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Digital Asset Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_1 [label=Cinematography color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+		nest1_2 [label="Film Financing" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+		nest1_3 [label="Audience Research" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=uploads color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=captures color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=produces color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest0_0 [label=secures color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N4 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> S2 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#80DDEA" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [label=mixes color="#80DDEA" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_30.dot b/test/graphviz/scanned_medium/graphviz_30.dot
new file mode 100644
index 0000000000000000000000000000000000000000..8a5f1a5a731a30b1bd6d439631d360e4466d145e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_30.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=BT
+	N0 [label=Distribution color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N1 [label=Packaging color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N2 [label="Regulatory Compliance" color="#2196F3" fillcolor="#BBDEFB" shape=oval style=filled]
+	N3 [label="Cuisine Innovation" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+	N4 [label="Dietary Requirement Accommodation" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N5 [label="Nutrition Analysis" color="#2196F3" fillcolor="#BBDEFB" shape=oval style=filled]
+	N6 [label="New Product Launch" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N7 [label="Supply Chain Traceability" color="#FFC2C2" fillcolor="#FFEBEB" shape=diamond style=filled]
+	N8 [label=Brewing color="#6EB76D" fillcolor="#E9F7E8" shape=hexagon style=filled]
+	N9 [label=Cooking color="#6EB76D" fillcolor="#E9F7E8" shape=diamond style=filled]
+	N10 [label="Ingredient Traceability" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N11 [label="Service Delivery" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N0 -> N1 [label=regulates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=heats color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=operates color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=certifies color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N1 [label=freezes color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N9 -> N6 [label=audits color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_302.dot b/test/graphviz/scanned_medium/graphviz_302.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f1c43aab35d91ae506b7d5801aaae25e17191f71
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_302.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=RL
+	N0 [label="Data Quality Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Budget Performance Analysis" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N2 [label="Financial Performance Reporting" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+	N3 [label="Prescriptive Analytics Implementation" color="#FFC107" fillcolor="#FFECB3" shape=plaintext style=filled]
+	N4 [label="Customer Behavior Insights" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N5 [label="Operational Efficiency Measurement" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N6 [label="Market Trend Analysis" color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+	N7 [label="Data Mart Design" color="#A2D0FF" fillcolor="#E8F0FF" shape=parallelogram style=filled]
+	N8 [label="Business Process Improvement" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N9 [label="Dashboard Design" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N10 [label="Master Data Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+	N11 [label="User Training and Support" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N12 [label="Data Governance Policies" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+	N13 [label="Strategic Planning Support" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N14 [label="Report Automation" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N15 [label="Query Optimization" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A2D0FF" fillcolor="#E8F0FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Mobile BI Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Actionable Insights Generation" color="#A2D0FF" fillcolor="#E8F0FF" shape=octagon style=filled]
+		nest0_1 [label="ETL Development" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Supply Chain Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Data Security in BI" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+		nest1_1 [label="Self_Service BI Tools" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+		nest1_2 [label="Sales Forecasting" color="#CD8FF2" fillcolor="#ECCFF5" shape=plaintext style=filled]
+		nest1_0 -> nest1_1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [label=integrates color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=communicates color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=extracts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest1_0 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N9 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	S0 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N1 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> S2 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	S2 -> N13 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N9 [label=visualizes color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_303.dot b/test/graphviz/scanned_medium/graphviz_303.dot
new file mode 100644
index 0000000000000000000000000000000000000000..14b464ab1a8eb1e213e3c4e3ef2e17ecf0f50bbd
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_303.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=LR
+	N0 [label="Guerilla Marketing" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N1 [label="Partnership Marketing" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N2 [label="Customer Segmentation" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N3 [label="Pricing Strategy" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N4 [label="Experiential Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=oval style=filled]
+	N5 [label="Conversion Rate Optimization" color="#AABEC6" fillcolor="#E0E6E9" shape=octagon style=filled]
+	N6 [label="Competitive Analysis" color="#AABEC6" fillcolor="#E0E6E9" shape=parallelogram style=filled]
+	N7 [label="Remarketing Campaigns" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N8 [label=Telemarketing color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+	N9 [label="Influencer Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=ellipse style=filled]
+	N10 [label="Lead Generation" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+	N11 [label="Search Engine Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=parallelogram style=filled]
+	N12 [label="Event Marketing" color="#90A4AE" fillcolor="#ECEFF1" shape=plaintext style=filled]
+	N13 [label="A or B Testing for Marketing" color="#AABEC6" fillcolor="#E0E6E9" shape=ellipse style=filled]
+	N14 [label="Video Marketing" color="#AABEC6" fillcolor="#E0E6E9" shape=oval style=filled]
+	N15 [label="Affiliate Marketing" color="#AABEC6" fillcolor="#E0E6E9" shape=plaintext style=filled]
+	N16 [label="Brand Strategy Development" color="#90A4AE" fillcolor="#ECEFF1" shape=diamond style=filled]
+	N17 [label="Customer Journey Mapping" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	S0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#AABEC6" fillcolor="#E0E6E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#90A4AE" fillcolor="#ECEFF1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Email Marketing" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Marketing Analytics" color="#5C6BC0" fillcolor="#E8EAF6" shape=folder style=filled]
+		nest0_1 [label="Direct Mail Marketing" color="#AABEC6" fillcolor="#E0E6E9" shape=box style=filled]
+		nest0_2 [label="Brand Reputation Management" color="#90A4AE" fillcolor="#ECEFF1" shape=box style=filled]
+		nest0_3 [label="Market Research" color="#90A4AE" fillcolor="#ECEFF1" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Target Audience Identification" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Product Launch Strategy" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+		nest1_1 [label="Marketing Automation" color="#AABEC6" fillcolor="#E0E6E9" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="uses CRMs" color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [label="runs SEM" color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N16 -> N17 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N12 -> nest0_0 [label="sends emails" color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest1_0 [label="forms partnerships" color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N15 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N6 -> S0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [label="automates tasks" color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N13 -> S2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N16 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S2 -> N15 [color="#AABEC6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#AABEC6" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N8 [color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_304.txt b/test/graphviz/scanned_medium/graphviz_304.txt
new file mode 100644
index 0000000000000000000000000000000000000000..76e03097bc0632c78f2be6655514c224be386e39
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_304.txt
@@ -0,0 +1,31 @@
+<A or B Testing for Ads, drives conversions, Native Advertising>
+<Ad Copywriting, connectedTo, A or B Testing for Ads>
+<Ad Copywriting, connectedTo, Fraud Detection in Ads>
+<Ad Copywriting, connectedTo, Native Advertising>
+<Ad Placement Optimization, connectedTo, A or B Testing for Ads>
+<Ad Placement Optimization, connectedTo, Ad Copywriting>
+<Ad Placement Optimization, connectedTo, Digital Advertising>
+<Ad Placement Optimization, connectedTo, Native Advertising>
+<Demographic Targeting, partOf, Demographic Targeting>
+<Demographic Targeting, tracks performance, Print Advertising>
+<Digital Advertising, connectedTo, Ad Copywriting>
+<Digital Advertising, connectedTo, Native Advertising>
+<Digital Advertising, connectedTo, Video Advertising>
+<Fraud Detection in Ads, connectedTo, Demographic Targeting>
+<Fraud Detection in Ads, partOf, Fraud Detection in Ads>
+<Landing Page Optimization, connectedTo, Visual Design for Ads>
+<Landing Page Optimization, partOf, Landing Page Optimization>
+<Print Advertising, manages budgets, Return on Ad Spend Calculation>
+<Print Advertising, partOf, Print Advertising>
+<Radio Advertising, connectedTo, Search Engine Ads>
+<Return on Ad Spend Calculation, connectedTo, Digital Advertising>
+<Return on Ad Spend Calculation, partOf, Return on Ad Spend Calculation>
+<Search Engine Ads, connectedTo, Ad Placement Optimization>
+<Search Engine Ads, connectedTo, Native Advertising>
+<Search Engine Ads, television ads, Digital Advertising>
+<Television Advertising, connectedTo, Landing Page Optimization>
+<Television Advertising, partOf, Television Advertising>
+<Video Advertising, connectedTo, Television Advertising>
+<Video Advertising, partOf, Video Advertising>
+<Visual Design for Ads, connectedTo, Digital Advertising>
+<Visual Design for Ads, partOf, Visual Design for Ads>
diff --git a/test/graphviz/scanned_medium/graphviz_305.dot b/test/graphviz/scanned_medium/graphviz_305.dot
new file mode 100644
index 0000000000000000000000000000000000000000..911c88aa6b066549ae4a276335b3020acc59d398
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_305.dot
@@ -0,0 +1,68 @@
+digraph {
+	rankdir=LR
+	N0 [label="Smart Contract Development" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N1 [label="Distributed Ledger Technology" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N2 [label="Security Auditing for Blockchains" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N3 [label="Zero_Knowledge Proofs" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+	N4 [label="Initial Coin Offerings" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+	N5 [label="Mining Operations" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N6 [label="Private Blockchain Implementation" color="#9FA9E1" fillcolor="#D6D9F0" shape=Mdiamond style=filled]
+	N7 [label="Intellectual Property Management" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+	N8 [label="Financial Asset Tokenization" color="#26A69A" fillcolor="#E0F2F1" shape=oval style=filled]
+	N9 [label="Tokenomics Design" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N10 [label="Energy Trading on Blockchain" color="#00BCD4" fillcolor="#B2EBF2" shape=diamond style=filled]
+	N11 [label="Decentralized Applications Development" color="#00BCD4" fillcolor="#B2EBF2" shape=oval style=filled]
+	N12 [label="Digital Identity Management" color="#26A69A" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N13 [label="Enterprise Blockchain Solutions" color="#00BCD4" fillcolor="#B2EBF2" shape=Mdiamond style=filled]
+	N14 [label="Real Estate Tokenization" color="#9FA9E1" fillcolor="#D6D9F0" shape=octagon style=filled]
+	N15 [label="Transaction Verification" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#26A69A" fillcolor="#E0F2F1" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#00BCD4" fillcolor="#B2EBF2" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E8F5E9" fontname=Helvetica fontsize=10 label="Voting Systems on Blockchain" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Scalability Solutions" color="#00BCD4" fillcolor="#B2EBF2" shape=box style=filled]
+		nest0_1 [label="Cross_Chain Bridges" color="#26A69A" fillcolor="#E0F2F1" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Decentralized Network Design" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Decentralized Finance Protocols" color="#26A69A" fillcolor="#E0F2F1" shape=box style=filled]
+		nest1_1 [label="Sidechains and Layer 2 Solutions" color="#00BCD4" fillcolor="#B2EBF2" shape=hexagon style=filled]
+		nest1_2 [label="Governance Models for Blockchains" color="#26A69A" fillcolor="#E0F2F1" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="performs KYCs" color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [label="ensures compliance" color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N4 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N11 -> nest1_0 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#00BCD4" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M0 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N11 [color="#26A69A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [label="enables voting" color="#26A69A" dir=forward penwidth=1.5 style=solid]
+	M2 -> N3 [color="#00BCD4" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N14 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_306.txt b/test/graphviz/scanned_medium/graphviz_306.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4574835f5cf0f0e6823baf0120386ad53584e45f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_306.txt
@@ -0,0 +1,39 @@
+<Airdrop Campaigns, connectedTo, Cold Storage Solutions>
+<Airdrop Campaigns, connectedTo, NFT Marketplace Development>
+<Blockchain Explorers, connectedTo, Security Audits>
+<Blockchain Explorers, partOf, Blockchain Explorers>
+<Coin Creation, connectedTo, Custodial Services>
+<Cold Storage Solutions, connectedTo, Liquidity Provision>
+<Decentralized Autonomous Organizations, connectedTo, Cold Storage Solutions>
+<Decentralized Autonomous Organizations, connectedTo, Custodial Services>
+<Decentralized Autonomous Organizations, connectedTo, Fiat On or Off Ramps>
+<Decentralized Autonomous Organizations, connectedTo, Staking>
+<Exchange Listing, connectedTo, Key Management>
+<Exchange Listing, partOf, Exchange Listing>
+<Fiat On or Off Ramps, connectedTo, Coin Creation>
+<Hot Wallet Security, connectedTo, Decentralized Autonomous Organizations>
+<Hot Wallet Security, connectedTo, Initial Exchange Offering>
+<Hot Wallet Security, connectedTo, Tax Reporting for Crypto>
+<Initial Exchange Offering, connectedTo, Cold Storage Solutions>
+<Initial Exchange Offering, connectedTo, Exchange Listing>
+<Key Management, connectedTo, Blockchain Explorers>
+<Key Management, partOf, Key Management>
+<Liquidity Provision, connectedTo, Fiat On or Off Ramps>
+<Market Analysis, partOf, Market Analysis>
+<Market Analysis, stakes assets, Decentralized Autonomous Organizations>
+<NFT Marketplace Development, connectedTo, Coin Creation>
+<NFT Marketplace Development, connectedTo, Cold Storage Solutions>
+<NFT Marketplace Development, connectedTo, Custodial Services>
+<NFT Marketplace Development, connectedTo, Hot Wallet Security>
+<NFT Marketplace Development, connectedTo, Initial Exchange Offering>
+<NFT Marketplace Development, enables swaps, Initial Exchange Offering>
+<Portfolio Management, connectedTo, Market Analysis>
+<Portfolio Management, partOf, Portfolio Management>
+<Security Audits, connectedTo, Custodial Services>
+<Security Audits, partOf, Security Audits>
+<Staking, connectedTo, Cold Storage Solutions>
+<Staking, connectedTo, Initial Exchange Offering>
+<Tax Reporting for Crypto, connectedTo, Web3 Integration>
+<Tax Reporting for Crypto, partOf, Tax Reporting for Crypto>
+<Web3 Integration, connectedTo, Portfolio Management>
+<Web3 Integration, partOf, Web3 Integration>
diff --git a/test/graphviz/scanned_medium/graphviz_307.txt b/test/graphviz/scanned_medium/graphviz_307.txt
new file mode 100644
index 0000000000000000000000000000000000000000..593245ed04705a37d2ae3af77a27579f13f87def
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_307.txt
@@ -0,0 +1,36 @@
+<Backer Communication, connectedTo, Due Diligence for Projects>
+<Backer Communication, plans promotions, Pitch Deck Preparation>
+<Donation_Based Crowdfunding, connectedTo, Manufacturing Planning>
+<Donation_Based Crowdfunding, partOf, Donation_Based Crowdfunding>
+<Due Diligence for Projects, creates campaigns, Equity Crowdfunding>
+<Email List Building, connectedTo, Investor Relations>
+<Fulfillment Planning, connectedTo, Backer Communication>
+<Fulfillment Planning, connectedTo, Due Diligence for Projects>
+<Fulfillment Planning, connectedTo, Logistics for Rewards>
+<Fulfillment Planning, connectedTo, Real Estate Crowdfunding>
+<Intellectual Property Protection, connectedTo, Donation_Based Crowdfunding>
+<Intellectual Property Protection, connectedTo, Logistics for Rewards>
+<International Crowdfunding, connectedTo, Video Production for Campaigns>
+<International Crowdfunding, partOf, International Crowdfunding>
+<Investor Relations, connectedTo, Fulfillment Planning>
+<Investor Verification, connectedTo, Due Diligence for Projects>
+<Investor Verification, partOf, Investor Verification>
+<Logistics for Rewards, connectedTo, Backer Communication>
+<Logistics for Rewards, connectedTo, Due Diligence for Projects>
+<Logistics for Rewards, connectedTo, Post_Campaign Reporting>
+<Manufacturing Planning, connectedTo, International Crowdfunding>
+<Manufacturing Planning, partOf, Manufacturing Planning>
+<Pitch Deck Preparation, connectedTo, Due Diligence for Projects>
+<Post_Campaign Reporting, connectedTo, Investor Verification>
+<Post_Campaign Reporting, partOf, Post_Campaign Reporting>
+<Real Estate Crowdfunding, connectedTo, Social Media Promotion>
+<Securities Regulations Adherence, connectedTo, Backer Communication>
+<Securities Regulations Adherence, connectedTo, Email List Building>
+<Securities Regulations Adherence, connectedTo, Equity Crowdfunding>
+<Securities Regulations Adherence, connectedTo, Real Estate Crowdfunding>
+<Securities Regulations Adherence, connectedTo, Social Media Promotion>
+<Social Media Promotion, connectedTo, Intellectual Property Protection>
+<Tax Implications of Crowdfunding, connectedTo, Securities Regulations Adherence>
+<Tax Implications of Crowdfunding, markets projects, Social Media Promotion>
+<Video Production for Campaigns, connectedTo, Due Diligence for Projects>
+<Video Production for Campaigns, partOf, Video Production for Campaigns>
diff --git a/test/graphviz/scanned_medium/graphviz_31.dot b/test/graphviz/scanned_medium/graphviz_31.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2130c98aec784510b9b61695f68acf3b60bbc16c
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_31.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=LR
+	N0 [label="Sports Analytics" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Fan Experience Enhancement" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N2 [label="Rule Enforcement" color="#61CAC3" fillcolor="#C2E8E6" shape=octagon style=filled]
+	N3 [label="Sports Technology Integration" color="#7986CB" fillcolor="#E8EAF6" shape=folder style=filled]
+	N4 [label="Media Rights Negotiation" color="#7986CB" fillcolor="#E8EAF6" shape=box style=filled]
+	N5 [label="Injury Management" color="#61CAC3" fillcolor="#C2E8E6" shape=box style=filled]
+	N6 [label="Event Broadcasting" color="#B8C0F5" fillcolor="#ECF0FD" shape=Mdiamond style=filled]
+	N7 [label=Refereeing color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N0 -> N1 [color="#B8C0F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=secures color="#61CAC3" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=sells color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=optimizes color="#7986CB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=markets color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N2 [label=regulates color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_310.txt b/test/graphviz/scanned_medium/graphviz_310.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4c11edf7cfc227ef874b6012dfd45360f22c065d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_310.txt
@@ -0,0 +1,31 @@
+<API Management in Cloud, connectedTo, Cloud Audit Trails>
+<Cloud Architecture Design, connectedTo, Multi_Cloud Management>
+<Cloud Architecture Design, partOf, Cloud Architecture Design>
+<Cloud Audit Trails, connectedTo, Software as a Service>
+<Cloud Automation, connectedTo, Resource Tagging for Cost Allocation>
+<Cloud Backup Solutions, connectedTo, Cloud Migration Strategy>
+<Cloud Governance, connectedTo, Cloud Marketplace Integration>
+<Cloud Marketplace Integration, connectedTo, API Management in Cloud>
+<Cloud Marketplace Integration, connectedTo, DevOps on Cloud>
+<Cloud Migration Strategy, connectedTo, Cloud Architecture Design>
+<Cloud Migration Strategy, connectedTo, Compliance in Cloud>
+<Cloud Migration Strategy, connectedTo, Disaster Recovery in Cloud>
+<Cloud Migration Strategy, connectedTo, Resource Tagging for Cost Allocation>
+<Cloud Monitoring and Logging, offers MLaaS, Cloud Automation>
+<Compliance in Cloud, connectedTo, Disaster Recovery in Cloud>
+<Cost Optimization in Cloud, connectedTo, Cloud Backup Solutions>
+<Cost Optimization in Cloud, connectedTo, Compliance in Cloud>
+<DevOps on Cloud, connectedTo, Edge_to_Cloud Integration>
+<DevOps on Cloud, partOf, DevOps on Cloud>
+<Disaster Recovery in Cloud, connectedTo, Identity and Access Management>
+<Edge_to_Cloud Integration, connectedTo, Cloud Automation>
+<Edge_to_Cloud Integration, partOf, Edge_to_Cloud Integration>
+<Identity and Access Management, connectedTo, Cloud Monitoring and Logging>
+<Load Balancing in Cloud, connectedTo, Cloud Governance>
+<Load Balancing in Cloud, connectedTo, Cloud Marketplace Integration>
+<Load Balancing in Cloud, connectedTo, Compliance in Cloud>
+<Multi_Cloud Management, builds hybrid clouds, Cloud Marketplace Integration>
+<Multi_Cloud Management, partOf, Multi_Cloud Management>
+<Private Cloud Management, connectedTo, Load Balancing in Cloud>
+<Private Cloud Management, tags resources, Cloud Marketplace Integration>
+<Software as a Service, processes big data, Cost Optimization in Cloud>
diff --git a/test/graphviz/scanned_medium/graphviz_313.dot b/test/graphviz/scanned_medium/graphviz_313.dot
new file mode 100644
index 0000000000000000000000000000000000000000..16f1cb71655f94a26e05c44376f5735a30dbf1aa
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_313.dot
@@ -0,0 +1,65 @@
+digraph {
+	rankdir=TD
+	N0 [label=Refactoring color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Security Hardening" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N2 [label="Integration Testing" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N3 [label="Frontend Development" color="#3F51B5" fillcolor="#C5CAE9" shape=hexagon style=filled]
+	N4 [label="Agile Methodologies" color="#3F51B5" fillcolor="#C5CAE9" shape=diamond style=filled]
+	N5 [label=Documentation color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N6 [label="Bug Fixing" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+	N7 [label="Cloud_Native Development" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N8 [label="User Interface Design" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+	N9 [label="Unit Testing" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="API Development" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Embedded Systems Development" color="#4CAF50" fillcolor="#C8E6C9" shape=diamond style=filled]
+		nest0_1 [label="Architecture Planning" color="#3F51B5" fillcolor="#C5CAE9" shape=box style=filled]
+		nest0_2 [label="Backend Development" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Version Control" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label=Deployment color="#4CAF50" fillcolor="#C8E6C9" shape=octagon style=filled]
+		nest1_1 [label=Maintenance color="#3F51B5" fillcolor="#C5CAE9" shape=octagon style=filled]
+		nest1_0 -> nest1_1 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="manages databases" color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="creates UIs" color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	nest0_2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_1 -> N8 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S0 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [label="architects systems" color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S2 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	S2 -> N5 [label="uses containers" color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_313.txt b/test/graphviz/scanned_medium/graphviz_313.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cadba3c446a859ad6f0625f41754b56f54e37160
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_313.txt
@@ -0,0 +1,30 @@
+<Agile Methodologies, connectedTo, Documentation>
+<Architecture Planning, connectedTo, Backend Development>
+<Architecture Planning, partOf, Architecture Planning>
+<Backend Development, connectedTo, Agile Methodologies>
+<Backend Development, partOf, Backend Development>
+<Bug Fixing, connectedTo, Cloud_Native Development>
+<Cloud_Native Development, connectedTo, User Interface Design>
+<Deployment, connectedTo, Maintenance>
+<Deployment, partOf, Deployment>
+<Documentation, connectedTo, Bug Fixing>
+<Embedded Systems Development, connectedTo, Architecture Planning>
+<Embedded Systems Development, partOf, Embedded Systems Development>
+<Frontend Development, connectedTo, Agile Methodologies>
+<Frontend Development, connectedTo, Deployment>
+<Frontend Development, connectedTo, User Interface Design>
+<Frontend Development, uses containers, Documentation>
+<Integration Testing, connectedTo, Agile Methodologies>
+<Integration Testing, creates UIs, Frontend Development>
+<Maintenance, connectedTo, User Interface Design>
+<Maintenance, partOf, Maintenance>
+<Refactoring, connectedTo, Agile Methodologies>
+<Refactoring, connectedTo, Security Hardening>
+<Security Hardening, architects systems, Unit Testing>
+<Security Hardening, connectedTo, Agile Methodologies>
+<Security Hardening, connectedTo, Cloud_Native Development>
+<Security Hardening, connectedTo, Documentation>
+<Security Hardening, connectedTo, Unit Testing>
+<Security Hardening, manages databases, Integration Testing>
+<User Interface Design, connectedTo, Embedded Systems Development>
+<User Interface Design, connectedTo, Unit Testing>
diff --git a/test/graphviz/scanned_medium/graphviz_314.txt b/test/graphviz/scanned_medium/graphviz_314.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aac305e1595d31b7b47cfa0a8034ab6b030e07ce
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_314.txt
@@ -0,0 +1,36 @@
+<Actuator Control, connectedTo, Firmware Development>
+<Actuator Control, connectedTo, Optical Module Design>
+<Assembly Line Optimization, connectedTo, Regulatory Compliance>
+<Assembly Line Optimization, partOf, Assembly Line Optimization>
+<Component Selection, connectedTo, Documentation>
+<Component Selection, connectedTo, Mechanical Design Integration>
+<Component Selection, connectedTo, Reverse Engineering>
+<Component Selection, connectedTo, Schematic Capture>
+<Cost Optimization, connectedTo, Component Selection>
+<Cost Optimization, connectedTo, Mechanical Design Integration>
+<Cost Optimization, connectedTo, Mixed_Signal Design>
+<Documentation, connectedTo, Reverse Engineering>
+<Environmental Testing, partOf, Environmental Testing>
+<Environmental Testing, tests environmental resilience, Assembly Line Optimization>
+<Firmware Development, connectedTo, Mechanical Design Integration>
+<Firmware Development, connectedTo, Signal Integrity Analysis>
+<Manufacturing Process Planning, connectedTo, Quality Control>
+<Manufacturing Process Planning, partOf, Manufacturing Process Planning>
+<Mixed_Signal Design, supervises assembly, Component Selection>
+<Optical Module Design, connectedTo, Environmental Testing>
+<Optical Module Design, partOf, Optical Module Design>
+<PCB Layout, connectedTo, Troubleshooting and Debugging>
+<Prototyping, connectedTo, Actuator Control>
+<Quality Control, connectedTo, Component Selection>
+<Quality Control, connectedTo, Mechanical Design Integration>
+<Quality Control, partOf, Quality Control>
+<RF Circuit Design, connectedTo, Manufacturing Process Planning>
+<RF Circuit Design, partOf, RF Circuit Design>
+<Regulatory Compliance, connectedTo, Cost Optimization>
+<Regulatory Compliance, partOf, Regulatory Compliance>
+<Reverse Engineering, connectedTo, Schematic Capture>
+<Schematic Capture, connectedTo, Prototyping>
+<Schematic Capture, connectedTo, RF Circuit Design>
+<Signal Integrity Analysis, connectedTo, Environmental Testing>
+<Signal Integrity Analysis, connectedTo, Mechanical Design Integration>
+<Troubleshooting and Debugging, connectedTo, Cost Optimization>
diff --git a/test/graphviz/scanned_medium/graphviz_315.dot b/test/graphviz/scanned_medium/graphviz_315.dot
new file mode 100644
index 0000000000000000000000000000000000000000..775a6a5479d0d385694b7f20058170c63d89263e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_315.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=TD
+	N0 [label=Wireframing color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N1 [label="User Experience Design" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N2 [label="Concept Development" color="#92C79A" fillcolor="#E8F0EA" shape=folder style=filled]
+	N3 [label="Security Implementation" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N4 [label="User Onboarding Flows" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+	N5 [label="User Feedback Collection" color="#92C79A" fillcolor="#E8F0EA" shape=octagon style=filled]
+	N6 [label="AR or VR Features in Mobile" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N7 [label="Gamification Elements" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N8 [label="Payment Gateway Integration" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N9 [label="Microphone Integration" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N10 [label="User Interface Design" color="#673AB7" fillcolor="#D1C4E9" shape=box style=filled]
+	N11 [label="In_App Purchase Integration" color="#64B5F6" fillcolor="#E3F2FD" shape=octagon style=filled]
+	N12 [label="Database Design for Mobile" color="#673AB7" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	S0 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#673AB7" fillcolor="#D1C4E9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#64B5F6" fillcolor="#E3F2FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Deployment to App Stores" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Offline Mode Development" color="#673AB7" fillcolor="#D1C4E9" shape=octagon style=filled]
+		nest0_1 [label="Accessibility Features" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+		nest0_0 -> nest0_1 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Performance Optimization" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Updates and Maintenance" color="#673AB7" fillcolor="#D1C4E9" shape=oval style=filled]
+		nest1_1 [label="Analytics Tracking" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest1_2 [label="Crash Reporting" color="#64B5F6" fillcolor="#E3F2FD" shape=hexagon style=filled]
+		nest1_3 [label=Prototyping color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="develops cross_platform apps" color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="enables real_time features" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="develops AR or VR features" color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [label="builds prototypes" color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N9 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	S0 -> N12 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N7 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N11 [color="#673AB7" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#673AB7" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_315.txt b/test/graphviz/scanned_medium/graphviz_315.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2664c6b656aae82eb32feffa1085da6c2338f720
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_315.txt
@@ -0,0 +1,35 @@
+<AR or VR Features in Mobile, connectedTo, Gamification Elements>
+<Accessibility Features, connectedTo, Payment Gateway Integration>
+<Accessibility Features, partOf, Accessibility Features>
+<Analytics Tracking, connectedTo, Crash Reporting>
+<Analytics Tracking, partOf, Analytics Tracking>
+<Concept Development, connectedTo, In_App Purchase Integration>
+<Concept Development, enables real_time features, Security Implementation>
+<Crash Reporting, connectedTo, Prototyping>
+<Crash Reporting, partOf, Crash Reporting>
+<Gamification Elements, connectedTo, Payment Gateway Integration>
+<In_App Purchase Integration, builds prototypes, Database Design for Mobile>
+<Microphone Integration, connectedTo, Database Design for Mobile>
+<Microphone Integration, connectedTo, In_App Purchase Integration>
+<Microphone Integration, connectedTo, Offline Mode Development>
+<Microphone Integration, connectedTo, User Interface Design>
+<Offline Mode Development, connectedTo, Accessibility Features>
+<Offline Mode Development, partOf, Offline Mode Development>
+<Payment Gateway Integration, connectedTo, Microphone Integration>
+<Prototyping, connectedTo, Microphone Integration>
+<Prototyping, partOf, Prototyping>
+<Security Implementation, connectedTo, In_App Purchase Integration>
+<Security Implementation, connectedTo, User Onboarding Flows>
+<Updates and Maintenance, connectedTo, Analytics Tracking>
+<Updates and Maintenance, partOf, Updates and Maintenance>
+<User Experience Design, connectedTo, User Feedback Collection>
+<User Experience Design, develops cross_platform apps, Concept Development>
+<User Feedback Collection, connectedTo, AR or VR Features in Mobile>
+<User Feedback Collection, connectedTo, In_App Purchase Integration>
+<User Interface Design, connectedTo, In_App Purchase Integration>
+<User Onboarding Flows, connectedTo, Updates and Maintenance>
+<User Onboarding Flows, develops AR or VR features, User Feedback Collection>
+<Wireframing, connectedTo, Gamification Elements>
+<Wireframing, connectedTo, In_App Purchase Integration>
+<Wireframing, connectedTo, User Experience Design>
+<Wireframing, connectedTo, User Feedback Collection>
diff --git a/test/graphviz/scanned_medium/graphviz_316.dot b/test/graphviz/scanned_medium/graphviz_316.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dc202da8c5c2e347886e4abeac198cbc936b1c11
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_316.dot
@@ -0,0 +1,77 @@
+digraph {
+	rankdir=LR
+	N0 [label="Trend Monitoring" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	N1 [label="Link_in_Bio Optimization" color="#795548" fillcolor="#D7CCC8" shape=octagon style=filled]
+	N2 [label="Partnership Management on Social" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N3 [label="Reporting and Optimization" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N4 [label="User_Generated Content Curation" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N5 [label="Follower Growth Monitoring" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N6 [label="Social Listening" color="#2196F3" fillcolor="#BBDEFB" shape=diamond style=filled]
+	N7 [label="Personal Branding on Social Media" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N8 [label="Content Strategy" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N9 [label="Platform Selection" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+	N10 [label="Engagement Rate Calculation" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N11 [label="Ethical Use of Social Media" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N12 [label=Cross_Promotion color="#795548" fillcolor="#D7CCC8" shape=octagon style=filled]
+	N13 [label="Crisis Management" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+	S0 [label="" color="#795548" fillcolor="#D7CCC8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#42A5F5" fillcolor="#F1F8FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#2196F3" fillcolor="#BBDEFB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Story Format Content Creation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Platform Algorithm Understanding" color="#2196F3" fillcolor="#BBDEFB" shape=diamond style=filled]
+		nest0_1 [label="Scheduling Posts" color="#795548" fillcolor="#D7CCC8" shape=oval style=filled]
+		nest0_2 [label="Competitor Analysis" color="#795548" fillcolor="#D7CCC8" shape=parallelogram style=filled]
+		nest0_3 [label="Content Moderation" color="#2196F3" fillcolor="#BBDEFB" shape=parallelogram style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#795548" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [label="manages crises" color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Social Media Audits" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Community Management" color="#2196F3" fillcolor="#BBDEFB" shape=ellipse style=filled]
+		nest1_1 [label="Reels or Short Video Production" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+		nest1_2 [label="Customer Service on Social Media" color="#2196F3" fillcolor="#BBDEFB" shape=box style=filled]
+		nest1_0 -> nest1_1 [label="collaborates with influencers" color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="manages profiles" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="curates UGC" color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> nest0_0 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N7 -> nest1_0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N11 [label="hosts live streams" color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> S2 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N13 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S2 -> N10 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label="monitors trends" color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M0 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N7 -> M0 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N13 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M2 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M2 [color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N7 [color="#795548" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_316.txt b/test/graphviz/scanned_medium/graphviz_316.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fa86e408a07d2388e372d25445367b1deb860386
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_316.txt
@@ -0,0 +1,41 @@
+<Community Management, collaborates with influencers, Reels or Short Video Production>
+<Community Management, partOf, Community Management>
+<Competitor Analysis, manages crises, Content Moderation>
+<Competitor Analysis, partOf, Competitor Analysis>
+<Content Moderation, connectedTo, Platform Selection>
+<Content Moderation, partOf, Content Moderation>
+<Content Strategy, connectedTo, Crisis Management>
+<Content Strategy, connectedTo, Engagement Rate Calculation>
+<Content Strategy, connectedTo, Ethical Use of Social Media>
+<Content Strategy, connectedTo, Platform Algorithm Understanding>
+<Content Strategy, connectedTo, Platform Selection>
+<Cross_Promotion, connectedTo, Crisis Management>
+<Customer Service on Social Media, hosts live streams, Ethical Use of Social Media>
+<Customer Service on Social Media, partOf, Customer Service on Social Media>
+<Engagement Rate Calculation, connectedTo, Ethical Use of Social Media>
+<Ethical Use of Social Media, connectedTo, Cross_Promotion>
+<Follower Growth Monitoring, connectedTo, Crisis Management>
+<Follower Growth Monitoring, connectedTo, Personal Branding on Social Media>
+<Follower Growth Monitoring, connectedTo, Social Listening>
+<Link_in_Bio Optimization, connectedTo, Partnership Management on Social>
+<Link_in_Bio Optimization, connectedTo, Personal Branding on Social Media>
+<Link_in_Bio Optimization, connectedTo, User_Generated Content Curation>
+<Link_in_Bio Optimization, monitors trends, Crisis Management>
+<Partnership Management on Social, connectedTo, Personal Branding on Social Media>
+<Partnership Management on Social, connectedTo, Reporting and Optimization>
+<Partnership Management on Social, connectedTo, User_Generated Content Curation>
+<Personal Branding on Social Media, connectedTo, Community Management>
+<Personal Branding on Social Media, connectedTo, Content Strategy>
+<Personal Branding on Social Media, connectedTo, Crisis Management>
+<Platform Algorithm Understanding, connectedTo, Scheduling Posts>
+<Platform Algorithm Understanding, partOf, Platform Algorithm Understanding>
+<Platform Selection, connectedTo, Crisis Management>
+<Platform Selection, connectedTo, Engagement Rate Calculation>
+<Reels or Short Video Production, connectedTo, Customer Service on Social Media>
+<Reels or Short Video Production, partOf, Reels or Short Video Production>
+<Reporting and Optimization, manages profiles, User_Generated Content Curation>
+<Scheduling Posts, connectedTo, Competitor Analysis>
+<Scheduling Posts, partOf, Scheduling Posts>
+<Social Listening, curates UGC, Personal Branding on Social Media>
+<Trend Monitoring, connectedTo, Link_in_Bio Optimization>
+<User_Generated Content Curation, connectedTo, Follower Growth Monitoring>
diff --git a/test/graphviz/scanned_medium/graphviz_317.dot b/test/graphviz/scanned_medium/graphviz_317.dot
new file mode 100644
index 0000000000000000000000000000000000000000..25422f2e6cdaa08b73fa39c80cbea117b4c02f97
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_317.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Indexing Content" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N1 [label="User Experience for Search" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N2 [label="Shopping Search" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N3 [label="Crawling Websites" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N4 [label="Core Web Vitals Optimization" color="#6EB76D" fillcolor="#E9F7E8" shape=plaintext style=filled]
+	N5 [label="Technical SEO" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N6 [label="Featured Snippets Optimization" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N7 [label="Algorithm Updates Monitoring" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N8 [label="Competitor Keyword Analysis" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N9 [label="User Intent Understanding" color="#CDDC39" fillcolor="#E6EE9C" shape=ellipse style=filled]
+	N10 [label="Content Quality Assessment" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+	N11 [label="Personalized Search Results" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N12 [label="On_Page SEO" color="#6EB76D" fillcolor="#E9F7E8" shape=box style=filled]
+	N13 [label="Video Search" color="#B0C5CD" fillcolor="#DFE7EB" shape=hexagon style=filled]
+	N14 [label="News Search" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N15 [label="Search Engine Optimization" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N16 [label="Negative SEO Prevention" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N17 [label="Site Architecture Optimization" color="#CDDC39" fillcolor="#E6EE9C" shape=oval style=filled]
+	N18 [label="Click_Through Rate Optimization" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N19 [label="Academic Search" color="#B0C5CD" fillcolor="#DFE7EB" shape=ellipse style=filled]
+	S0 [label="" color="#B0C5CD" fillcolor="#DFE7EB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#6EB76D" fillcolor="#E9F7E8" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#CDDC39" fillcolor="#E6EE9C" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="International SEO" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Keyword Research" color="#CDDC39" fillcolor="#E6EE9C" shape=diamond style=filled]
+		nest0_1 [label="Search Console Management" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest0_0 -> nest0_1 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FBE9E7" fontname=Helvetica fontsize=10 label="Local SEO" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Paid Search Advertising" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+		nest1_1 [label="Semantic Search" color="#6EB76D" fillcolor="#E9F7E8" shape=oval style=filled]
+		nest1_2 [label="Rank Tracking" color="#B0C5CD" fillcolor="#DFE7EB" shape=box style=filled]
+		nest1_3 [label="Mobile_First Indexing" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+		nest1_2 -> nest1_3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="processes updates" color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="personalizes results" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N15 -> N16 [label="manages penalties" color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N16 -> N17 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N17 -> N18 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N18 -> N19 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest0_0 [label="optimizes UX" color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> nest1_0 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N8 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#B0C5CD" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	S0 -> N11 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [label="manages PPC" color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N5 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N8 -> M0 [color="#CDDC39" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M0 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [label="manages international SEO" color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M0 -> N13 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#B0C5CD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_318.dot b/test/graphviz/scanned_medium/graphviz_318.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f216480166a651011a6b27d5d7636c43d369b047
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_318.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="KYC Integration" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N1 [label="Digital Signatures" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+	N2 [label="Fraud Detection in Identity" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	N3 [label=Authorization color="#9FA9E1" fillcolor="#D6D9F0" shape=folder style=filled]
+	N4 [label="Identity Verification" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+	N5 [label="Identity as a Service" color="#CD8FF2" fillcolor="#ECCFF5" shape=plaintext style=filled]
+	N6 [label="Federated Identity Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=folder style=filled]
+	N7 [label="Adaptive Authentication" color="#9FA9E1" fillcolor="#D6D9F0" shape=folder style=filled]
+	N8 [label="Identity Proofing" color="#9FA9E1" fillcolor="#D6D9F0" shape=ellipse style=filled]
+	N9 [label="User Registration" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N10 [label="Portable Identities" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N11 [label="Verifiable Credentials" color="#CD8FF2" fillcolor="#ECCFF5" shape=folder style=filled]
+	N12 [label="Access Governance" color="#CD8FF2" fillcolor="#ECCFF5" shape=octagon style=filled]
+	N13 [label="Password Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+	N14 [label="Identity Lifecycle Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N15 [label=Authentication color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	S0 [label="" color="#6FE1D5" fillcolor="#C9EFEC" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Workforce Identity Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Consent Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+		nest0_1 [label="Digital Wallets for Identity" color="#6FE1D5" fillcolor="#C9EFEC" shape=octagon style=filled]
+		nest0_0 -> nest0_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label=De_provisioning labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="User Provisioning" color="#CD8FF2" fillcolor="#ECCFF5" shape=diamond style=filled]
+		nest1_1 [label="API Security for Identity" color="#CD8FF2" fillcolor="#ECCFF5" shape=plaintext style=filled]
+		nest1_2 [label="Privileged Access Management" color="#9FA9E1" fillcolor="#D6D9F0" shape=parallelogram style=filled]
+		nest1_0 -> nest1_1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label="creates portable identities" color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N13 -> N14 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> nest1_0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N2 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N15 [color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N10 [label="uses blockchain" color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N3 -> S2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S2 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N6 -> M1 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N8 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N9 -> M1 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	M1 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_318.txt b/test/graphviz/scanned_medium/graphviz_318.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4292314a4c3259cdb2fe8f5a8c1aab1e2ce0536d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_318.txt
@@ -0,0 +1,38 @@
+<API Security for Identity, connectedTo, Privileged Access Management>
+<API Security for Identity, partOf, API Security for Identity>
+<Access Governance, connectedTo, Authentication>
+<Access Governance, connectedTo, Identity Lifecycle Management>
+<Access Governance, connectedTo, Password Management>
+<Adaptive Authentication, connectedTo, Identity Proofing>
+<Authorization, connectedTo, Adaptive Authentication>
+<Authorization, connectedTo, Identity Verification>
+<Authorization, connectedTo, Verifiable Credentials>
+<Consent Management, connectedTo, Digital Wallets for Identity>
+<Consent Management, partOf, Consent Management>
+<Digital Signatures, creates portable identities, Fraud Detection in Identity>
+<Digital Wallets for Identity, connectedTo, Identity Verification>
+<Digital Wallets for Identity, partOf, Digital Wallets for Identity>
+<Federated Identity Management, connectedTo, Adaptive Authentication>
+<Federated Identity Management, connectedTo, User Provisioning>
+<Federated Identity Management, connectedTo, Verifiable Credentials>
+<Fraud Detection in Identity, connectedTo, Authorization>
+<Fraud Detection in Identity, connectedTo, Verifiable Credentials>
+<Identity Lifecycle Management, connectedTo, Authentication>
+<Identity Proofing, connectedTo, User Registration>
+<Identity Proofing, connectedTo, Verifiable Credentials>
+<Identity Verification, connectedTo, Identity as a Service>
+<Identity as a Service, connectedTo, Adaptive Authentication>
+<Identity as a Service, connectedTo, Authentication>
+<Identity as a Service, connectedTo, Consent Management>
+<Identity as a Service, connectedTo, Federated Identity Management>
+<Identity as a Service, uses blockchain, Portable Identities>
+<KYC Integration, connectedTo, Digital Signatures>
+<Password Management, connectedTo, Identity Lifecycle Management>
+<Portable Identities, connectedTo, Verifiable Credentials>
+<Privileged Access Management, connectedTo, Fraud Detection in Identity>
+<Privileged Access Management, partOf, Privileged Access Management>
+<User Provisioning, connectedTo, API Security for Identity>
+<User Provisioning, partOf, User Provisioning>
+<User Registration, connectedTo, Portable Identities>
+<User Registration, connectedTo, Verifiable Credentials>
+<Verifiable Credentials, connectedTo, Access Governance>
diff --git a/test/graphviz/scanned_medium/graphviz_319.txt b/test/graphviz/scanned_medium/graphviz_319.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c2818b3fe16df37aa9ae3084c4591dff13de6314
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_319.txt
@@ -0,0 +1,31 @@
+<AI in Online Education, gamifies experiences, Gamification in Education>
+<AI in Online Education, partOf, AI in Online Education>
+<Accessibility Features, connectedTo, Language Learning Platforms>
+<Accessibility Features, partOf, Accessibility Features>
+<Assessment Design, connectedTo, Online Tutoring>
+<Assessment Design, connectedTo, Virtual Classroom Facilitation>
+<Bootcamp Development, connectedTo, Learning Management System Administration>
+<Curriculum Development, connectedTo, AI in Online Education>
+<Curriculum Development, partOf, Curriculum Development>
+<Gamification in Education, connectedTo, Language Learning Platforms>
+<Gamification in Education, partOf, Gamification in Education>
+<Language Learning Platforms, connectedTo, Bootcamp Development>
+<Learning Management System Administration, connectedTo, Curriculum Development>
+<Learning Management System Administration, connectedTo, Virtual Field Trips>
+<Online Tutoring, connectedTo, Test Preparation Courses>
+<Online Tutoring, connectedTo, Virtual Classroom Facilitation>
+<Parent or Guardian Communication, connectedTo, Competency_Based Education>
+<Parent or Guardian Communication, connectedTo, Professional Development Courses>
+<Professional Development Courses, connectedTo, Accessibility Features>
+<Professional Development Courses, partOf, Professional Development Courses>
+<Test Preparation Courses, connectedTo, Learning Management System Administration>
+<Test Preparation Courses, connectedTo, Virtual Classroom Facilitation>
+<Test Preparation Courses, connectedTo, Virtual Labs and Simulations>
+<Virtual Classroom Facilitation, connectedTo, Competency_Based Education>
+<Virtual Classroom Facilitation, connectedTo, Language Learning Platforms>
+<Virtual Classroom Facilitation, connectedTo, Learning Management System Administration>
+<Virtual Classroom Facilitation, connectedTo, Parent or Guardian Communication>
+<Virtual Classroom Facilitation, connectedTo, Virtual Field Trips>
+<Virtual Field Trips, connectedTo, Parent or Guardian Communication>
+<Virtual Labs and Simulations, connectedTo, Learning Management System Administration>
+<Virtual Labs and Simulations, connectedTo, Virtual Classroom Facilitation>
diff --git a/test/graphviz/scanned_medium/graphviz_320.dot b/test/graphviz/scanned_medium/graphviz_320.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2e4feabe42fec1a56bae9de44bcd7fbb7e535006
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_320.dot
@@ -0,0 +1,76 @@
+digraph {
+	rankdir=LR
+	N0 [label="Completion Rate Optimization" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N1 [label="Video Lecture Production" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N2 [label="Marketing to Global Audience" color="#AF56A6" fillcolor="#DDCEDD" shape=plaintext style=filled]
+	N3 [label="Mobile Learning Experience" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N4 [label="Content Licensing" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N5 [label="Peer Grading Implementation" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N6 [label="Learner Feedback Analysis" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N7 [label="Course Content Development" color="#4CAF50" fillcolor="#C8E6C9" shape=plaintext style=filled]
+	N8 [label="Technical Infrastructure for Scale" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+	N9 [label="Engagement Metrics Tracking" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N10 [label="Learner Analytics" color="#4CAF50" fillcolor="#C8E6C9" shape=parallelogram style=filled]
+	N11 [label="Employer Recognition" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N12 [label="Verified Track Management" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N13 [label="University Partnerships" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N14 [label="Career Pathway Mapping" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N15 [label="Discussion Forum Management" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	S0 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#C2B2F0" fillcolor="#EFE6FF" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#AF56A6" fillcolor="#DDCEDD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E0F2F1" fontname=Helvetica fontsize=10 label="Learner Support" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Micro_credential Stacking" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+		nest0_1 [label="Certificate of Completion Issuance" color="#4CAF50" fillcolor="#C8E6C9" shape=Mdiamond style=filled]
+		nest0_2 [label="Course Promotion" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+		nest0_3 [label="Course Pilot Testing" color="#C2B2F0" fillcolor="#EFE6FF" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [label="optimizes engagement" color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+		nest0_2 -> nest0_3 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Self_Paced Learning Tracks" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Platform Selection" color="#C2B2F0" fillcolor="#EFE6FF" shape=oval style=filled]
+		nest1_1 [label="Skill_Based Learning Outcomes" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+		nest1_2 [label="Gamification for Engagement" color="#AF56A6" fillcolor="#DDCEDD" shape=hexagon style=filled]
+		nest1_0 -> nest1_1 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="updates content" color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N14 -> N15 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N12 -> nest0_0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N9 [label="provides technical support" color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N4 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N12 -> S0 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N14 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S0 -> N15 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N12 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	S1 -> N14 [label="facilitates peer review" color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N4 -> M0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> M0 [label="collaborates with experts" color="#C2B2F0" dir=forward penwidth=1.5 style=solid]
+	M0 -> N9 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N13 -> M1 [color="#C2B2F0" dir=forward penwidth=1.5 style=dashed]
+	N10 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M1 -> N15 [color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_321.dot b/test/graphviz/scanned_medium/graphviz_321.dot
new file mode 100644
index 0000000000000000000000000000000000000000..56e0dfe5eac2c513a80a5019d7d77b53456f2a6b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_321.dot
@@ -0,0 +1,67 @@
+digraph {
+	rankdir=LR
+	N0 [label="Online Course Delivery" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Graduate School Exam Prep" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N2 [label="Reading Comprehension Drills" color="#FFB2A5" fillcolor="#FFDCD6" shape=folder style=filled]
+	N3 [label="Parent or Guardian Updates" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N4 [label="Student Progress Tracking" color="#FFB2A5" fillcolor="#FFDCD6" shape=parallelogram style=filled]
+	N5 [label="College Entrance Exam Prep" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N6 [label="Video Lecture Production" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N7 [label="Study Group Facilitation" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N8 [label="Memory Techniques Training" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N9 [label="Critical Thinking Development" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N10 [label="Flashcard Creation" color="#FFB2A5" fillcolor="#FFDCD6" shape=ellipse style=filled]
+	S0 [label="" color="#FFB2A5" fillcolor="#FFDCD6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#A188DB" fillcolor="#DED7F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#5C6BC0" fillcolor="#E8EAF6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Writing Skills Improvement" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Professional Licensure Exam Prep" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest0_1 [label="Practice Test Creation" color="#A188DB" fillcolor="#DED7F0" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FCE4EC" fontname=Helvetica fontsize=10 label="Tutoring Session" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Certification Exam Prep" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+		nest1_1 [label="Science Concept Review" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+		nest1_2 [label="Exam Day Tips" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=accelerates color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> nest0_0 [label=develops color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N3 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [label=diagnoses color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N5 [label=scores color="#FFB2A5" dir=forward penwidth=1.5 style=solid]
+	N3 -> S1 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#FFB2A5" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N6 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	S2 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	S2 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N2 -> M1 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	M1 -> N5 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_323.txt b/test/graphviz/scanned_medium/graphviz_323.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ed4d2ecdb281cc42635f17232d20f20517901cea
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_323.txt
@@ -0,0 +1,41 @@
+<Anxiety Management, connectedTo, Group Therapy>
+<Anxiety Management, partOf, Anxiety Management>
+<Art Therapy, connectedTo, Therapy Session>
+<Child & Adolescent Therapy, connectedTo, Dialectical Behavior Therapy>
+<Coping Skill Development, connectedTo, Child & Adolescent Therapy>
+<Coping Skill Development, connectedTo, Diagnosis and Assessment>
+<Coping Skill Development, connectedTo, Schizophrenia Management>
+<Diagnosis and Assessment, connectedTo, Post_Traumatic Stress Disorder Support>
+<Dialectical Behavior Therapy, connectedTo, Diagnosis and Assessment>
+<Dialectical Behavior Therapy, connectedTo, Telehealth Counseling>
+<Grief Counseling, connectedTo, Family Therapy>
+<Grief Counseling, connectedTo, Music Therapy>
+<Grief Counseling, connectedTo, Outpatient Program Management>
+<Grief Counseling, protects, Peer Support Programs>
+<Group Therapy, connectedTo, Diagnosis and Assessment>
+<Group Therapy, partOf, Group Therapy>
+<Inpatient Treatment Coordination, connectedTo, Coping Skill Development>
+<Inpatient Treatment Coordination, connectedTo, Diagnosis and Assessment>
+<Music Therapy, secures, Outpatient Program Management>
+<Outpatient Program Management, supports, Peer Support Programs>
+<Peer Support Programs, connectedTo, Family Therapy>
+<Post_Traumatic Stress Disorder Support, medicates, Stress Reduction Techniques>
+<Psychiatric Evaluation, connectedTo, Dialectical Behavior Therapy>
+<Psychiatric Evaluation, partOf, Psychiatric Evaluation>
+<Schizophrenia Management, connectedTo, Psychiatric Evaluation>
+<Schizophrenia Management, partOf, Schizophrenia Management>
+<Stress Reduction Techniques, connectedTo, Telehealth Counseling>
+<Stress Reduction Techniques, connectedTo, Trauma Therapy>
+<Support Group Facilitation, connectedTo, Workplace Mental Health Programs>
+<Support Group Facilitation, partOf, Support Group Facilitation>
+<Telehealth Counseling, connectedTo, Grief Counseling>
+<Therapy Session, connectedTo, Telehealth Counseling>
+<Trauma Therapy, connectedTo, Family Therapy>
+<Trauma Therapy, connectedTo, Grief Counseling>
+<Trauma Therapy, connectedTo, Music Therapy>
+<Trauma Therapy, connectedTo, Support Group Facilitation>
+<Trauma Therapy, connectedTo, Telehealth Counseling>
+<Trauma Therapy, coping, Art Therapy>
+<Trauma Therapy, facilitates, Peer Support Programs>
+<Workplace Mental Health Programs, connectedTo, Anxiety Management>
+<Workplace Mental Health Programs, partOf, Workplace Mental Health Programs>
diff --git a/test/graphviz/scanned_medium/graphviz_324.dot b/test/graphviz/scanned_medium/graphviz_324.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2da72d583b465cb0558d65c66b786b28969fa470
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_324.dot
@@ -0,0 +1,64 @@
+digraph {
+	rankdir=RL
+	N0 [label="Community Nutrition Workshops" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Restaurant Menu Analysis" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N2 [label="Metabolism Rate Assessment" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N3 [label="Food Waste Reduction" color="#9FA9E1" fillcolor="#D6D9F0" shape=diamond style=filled]
+	N4 [label="Dietary Software Usage" color="#9FA9E1" fillcolor="#D6D9F0" shape=hexagon style=filled]
+	N5 [label="Hydration Planning" color="#E91E63" fillcolor="#F8BBD0" shape=hexagon style=filled]
+	N6 [label="Sports Nutrition" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N7 [label="Food Safety Education" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N8 [label="Body Composition Analysis" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N9 [label="Food Allergy Management" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N10 [label="Nutritional Biomarker Analysis" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N11 [label="Food Service Management Consulting" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N12 [label="Disease_Specific Nutrition" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	S0 [label="" color="#9FA9E1" fillcolor="#D6D9F0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F1F8E9" fontname=Helvetica fontsize=10 label="Dietary Supplement Review" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Sustainable Food Systems" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+		nest0_1 [label="Elderly Nutrition" color="#9FA9E1" fillcolor="#D6D9F0" shape=plaintext style=filled]
+		nest0_0 -> nest0_1 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Detoxification Programs" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Public Health Nutrition Programs" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_1 [label="Clinical Nutrition Support" color="#9FA9E1" fillcolor="#D6D9F0" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=certifies color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> nest0_0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N10 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N11 [label=analyzes color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S0 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N6 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N9 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N12 [color="#9FA9E1" dir=forward penwidth=1.5 style=solid]
+	S1 -> N11 [label=monitors color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [label=labels color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M0 [color="#9FA9E1" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	M0 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	M1 -> N7 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_324.txt b/test/graphviz/scanned_medium/graphviz_324.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fd90de5f3aebc74a0b28c82e349b7bc898a96dce
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_324.txt
@@ -0,0 +1,31 @@
+<Body Composition Analysis, connectedTo, Food Allergy Management>
+<Clinical Nutrition Support, analyzes, Food Service Management Consulting>
+<Clinical Nutrition Support, partOf, Clinical Nutrition Support>
+<Community Nutrition Workshops, connectedTo, Food Allergy Management>
+<Community Nutrition Workshops, connectedTo, Food Safety Education>
+<Community Nutrition Workshops, connectedTo, Restaurant Menu Analysis>
+<Community Nutrition Workshops, connectedTo, Sports Nutrition>
+<Dietary Software Usage, connectedTo, Hydration Planning>
+<Dietary Software Usage, connectedTo, Sports Nutrition>
+<Elderly Nutrition, connectedTo, Sports Nutrition>
+<Elderly Nutrition, partOf, Elderly Nutrition>
+<Food Allergy Management, connectedTo, Disease_Specific Nutrition>
+<Food Allergy Management, connectedTo, Nutritional Biomarker Analysis>
+<Food Allergy Management, connectedTo, Sustainable Food Systems>
+<Food Allergy Management, monitors, Food Service Management Consulting>
+<Food Safety Education, connectedTo, Body Composition Analysis>
+<Food Service Management Consulting, connectedTo, Disease_Specific Nutrition>
+<Food Waste Reduction, connectedTo, Dietary Software Usage>
+<Hydration Planning, connectedTo, Sports Nutrition>
+<Metabolism Rate Assessment, certifies, Food Waste Reduction>
+<Metabolism Rate Assessment, connectedTo, Sports Nutrition>
+<Nutritional Biomarker Analysis, connectedTo, Food Service Management Consulting>
+<Nutritional Biomarker Analysis, connectedTo, Public Health Nutrition Programs>
+<Public Health Nutrition Programs, connectedTo, Clinical Nutrition Support>
+<Public Health Nutrition Programs, partOf, Public Health Nutrition Programs>
+<Restaurant Menu Analysis, connectedTo, Food Safety Education>
+<Restaurant Menu Analysis, connectedTo, Metabolism Rate Assessment>
+<Restaurant Menu Analysis, labels, Sports Nutrition>
+<Sports Nutrition, connectedTo, Food Safety Education>
+<Sustainable Food Systems, connectedTo, Elderly Nutrition>
+<Sustainable Food Systems, partOf, Sustainable Food Systems>
diff --git a/test/graphviz/scanned_medium/graphviz_325.txt b/test/graphviz/scanned_medium/graphviz_325.txt
new file mode 100644
index 0000000000000000000000000000000000000000..75f1383e5354a6c194639c233674bc0f49bc5e84
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_325.txt
@@ -0,0 +1,31 @@
+<Balance and Coordination, connectedTo, Corporate Wellness Programs>
+<Balance and Coordination, connectedTo, Posture Correction>
+<Cardiovascular Training, connectedTo, Online Fitness Coaching>
+<Community Fitness Challenges, connectedTo, Recovery Strategies>
+<Corporate Wellness Programs, connectedTo, Strength Training>
+<Corporate Wellness Programs, connectedTo, Virtual Fitness Classes>
+<Endurance Training, connectedTo, Balance and Coordination>
+<Endurance Training, connectedTo, Corporate Wellness Programs>
+<Endurance Training, connectedTo, Virtual Fitness Classes>
+<Endurance Training, rehabilitates, Yoga Instruction>
+<HIIT Workouts, connectedTo, Virtual Fitness Classes>
+<Mind_Body Connection, connectedTo, HIIT Workouts>
+<Motivation and Goal Setting, connectedTo, Recovery Strategies>
+<Motivation and Goal Setting, partOf, Motivation and Goal Setting>
+<Online Fitness Coaching, connectedTo, Community Fitness Challenges>
+<Online Fitness Coaching, connectedTo, Yoga Instruction>
+<Outdoor Fitness Activities, connectedTo, Motivation and Goal Setting>
+<Outdoor Fitness Activities, partOf, Outdoor Fitness Activities>
+<Personal Training, connectedTo, Yoga Instruction>
+<Personal Training, partOf, Personal Training>
+<Personalized Exercise Prescriptions, connectedTo, Personal Training>
+<Personalized Exercise Prescriptions, partOf, Personalized Exercise Prescriptions>
+<Posture Correction, connectedTo, Outdoor Fitness Activities>
+<Posture Correction, partOf, Posture Correction>
+<Recovery Strategies, connectedTo, Endurance Training>
+<Strength Training, connectedTo, Personalized Exercise Prescriptions>
+<Strength Training, connectedTo, Virtual Fitness Classes>
+<Strength Training, connectedTo, Yoga Instruction>
+<Yoga Instruction, connectedTo, HIIT Workouts>
+<Yoga Instruction, connectedTo, Mind_Body Connection>
+<Yoga Instruction, connectedTo, Virtual Fitness Classes>
diff --git a/test/graphviz/scanned_medium/graphviz_326.txt b/test/graphviz/scanned_medium/graphviz_326.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5cbef211c68281cebd753aad44a46a9730d71644
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_326.txt
@@ -0,0 +1,30 @@
+<Acupuncture Consultation, connectedTo, Sleep Optimization>
+<Alternative Therapies, connectedTo, Employee Wellness Programs>
+<Alternative Therapies, partOf, Alternative Therapies>
+<Community Wellness Programs, connectedTo, Gut Health for Wellness>
+<Detox Programs, connectedTo, Hydrotherapy>
+<Detox Programs, connectedTo, Personal Growth Planning>
+<Detox Programs, connectedTo, Self_Care Routine Development>
+<Emotional Well_being, connectedTo, Chiropractic Care>
+<Emotional Well_being, connectedTo, Hydrotherapy>
+<Emotional Well_being, connectedTo, Longevity Planning>
+<Emotional Well_being, connectedTo, Nature Connection>
+<Employee Wellness Programs, connectedTo, Sleep Optimization>
+<Employee Wellness Programs, partOf, Employee Wellness Programs>
+<Gratitude Practice, balances, Self_Care Routine Development>
+<Gratitude Practice, partOf, Gratitude Practice>
+<Gut Health for Wellness, connectedTo, Acupuncture Consultation>
+<Hydrotherapy, connectedTo, Chiropractic Care>
+<Longevity Planning, connectedTo, Hydrotherapy>
+<Nature Connection, connectedTo, Alternative Therapies>
+<Nature Connection, connectedTo, Longevity Planning>
+<Nature Connection, connectedTo, Self_Care Routine Development>
+<Personal Growth Planning, connectedTo, Emotional Well_being>
+<Personal Growth Planning, connectedTo, Longevity Planning>
+<Positive Psychology Application, connectedTo, Stress Management>
+<Positive Psychology Application, partOf, Positive Psychology Application>
+<Self_Care Routine Development, connectedTo, Longevity Planning>
+<Self_Care Routine Development, connectedTo, Positive Psychology Application>
+<Sleep Optimization, connectedTo, Detox Programs>
+<Stress Management, connectedTo, Gratitude Practice>
+<Stress Management, partOf, Stress Management>
diff --git a/test/graphviz/scanned_medium/graphviz_327.txt b/test/graphviz/scanned_medium/graphviz_327.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9f504ec9310f8b95070974aa14114838aedca025
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_327.txt
@@ -0,0 +1,30 @@
+<Acoustic Treatment, connectedTo, Hospitality Interior Design>
+<Acoustic Treatment, connectedTo, Space Planning>
+<Art and Accessory Curation, connectedTo, Project Management>
+<Building Code Compliance, connectedTo, 3D Rendering>
+<Building Code Compliance, connectedTo, Art and Accessory Curation>
+<Building Code Compliance, connectedTo, Project Management>
+<Ergonomics Integration, connectedTo, 3D Rendering>
+<Ergonomics Integration, connectedTo, Acoustic Treatment>
+<Ergonomics Integration, connectedTo, Building Code Compliance>
+<Ergonomics Integration, connectedTo, Project Management>
+<Ergonomics Integration, connectedTo, Space Planning>
+<Furniture Selection, connectedTo, Wall Treatment Selection>
+<Furniture Selection, partOf, Furniture Selection>
+<Hospitality Interior Design, connectedTo, Office Space Design>
+<Hospitality Interior Design, partOf, Hospitality Interior Design>
+<Installation Supervision, connectedTo, Acoustic Treatment>
+<Installation Supervision, promotes, Lighting Design>
+<Lighting Design, connectedTo, Acoustic Treatment>
+<Lighting Design, connectedTo, Ergonomics Integration>
+<Lighting Design, connectedTo, Furniture Selection>
+<Office Space Design, connectedTo, Sustainable Design Practices>
+<Office Space Design, partOf, Office Space Design>
+<Project Management, connectedTo, 3D Rendering>
+<Space Planning, connectedTo, Building Code Compliance>
+<Sustainable Design Practices, connectedTo, Textile and Fabric Selection>
+<Sustainable Design Practices, partOf, Sustainable Design Practices>
+<Textile and Fabric Selection, connectedTo, Acoustic Treatment>
+<Textile and Fabric Selection, partOf, Textile and Fabric Selection>
+<Wall Treatment Selection, connectedTo, Building Code Compliance>
+<Wall Treatment Selection, partOf, Wall Treatment Selection>
diff --git a/test/graphviz/scanned_medium/graphviz_328.txt b/test/graphviz/scanned_medium/graphviz_328.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6be1e32ab27a8bd5192e28a33c5dc732dc292e45
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_328.txt
@@ -0,0 +1,35 @@
+<Accent Adaptation, connectedTo, Legal Document Translation>
+<Accent Adaptation, connectedTo, Offline Translation Capabilities>
+<Accent Adaptation, connectedTo, Social Media Translation>
+<Consecutive Interpretation, connectedTo, Subtitling Generation>
+<Custom Vocabulary Integration, connectedTo, Accent Adaptation>
+<Custom Vocabulary Integration, connectedTo, Consecutive Interpretation>
+<Custom Vocabulary Integration, connectedTo, Legal Document Translation>
+<Custom Vocabulary Integration, connectedTo, Offline Translation Capabilities>
+<Custom Vocabulary Integration, connectedTo, Social Media Translation>
+<Data Security for Translated Content, learns, Live Event Translation>
+<Data Security for Translated Content, partOf, Data Security for Translated Content>
+<Dialect Recognition, connectedTo, Social Media Translation>
+<Dialect Recognition, partOf, Dialect Recognition>
+<Legal Document Translation, connectedTo, Social Media Translation>
+<Legal Document Translation, connectedTo, Text_to_Speech Synthesis>
+<Legal Document Translation, secures, Consecutive Interpretation>
+<Live Event Translation, connectedTo, Low_Latency Processing>
+<Live Event Translation, partOf, Live Event Translation>
+<Low_Latency Processing, connectedTo, Neural Machine Translation>
+<Low_Latency Processing, partOf, Low_Latency Processing>
+<Meeting Translation Systems, connectedTo, Accent Adaptation>
+<Meeting Translation Systems, connectedTo, Consecutive Interpretation>
+<Meeting Translation Systems, connectedTo, Custom Vocabulary Integration>
+<Meeting Translation Systems, connectedTo, Wearable Translation Devices>
+<Neural Machine Translation, connectedTo, Custom Vocabulary Integration>
+<Neural Machine Translation, partOf, Neural Machine Translation>
+<Real_Time Document Translation, connectedTo, Dialect Recognition>
+<Real_Time Document Translation, partOf, Real_Time Document Translation>
+<Social Media Translation, connectedTo, Offline Translation Capabilities>
+<Subtitling Generation, connectedTo, Data Security for Translated Content>
+<Subtitling Generation, connectedTo, Real_Time Document Translation>
+<Subtitling Generation, connectedTo, Social Media Translation>
+<Text_to_Speech Synthesis, connectedTo, Consecutive Interpretation>
+<Wearable Translation Devices, connectedTo, Custom Vocabulary Integration>
+<Wearable Translation Devices, connectedTo, Social Media Translation>
diff --git a/test/graphviz/scanned_medium/graphviz_329.txt b/test/graphviz/scanned_medium/graphviz_329.txt
new file mode 100644
index 0000000000000000000000000000000000000000..aec553f46bdcd826fd92c87f3518fc4a81d76947
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_329.txt
@@ -0,0 +1,40 @@
+<AI for Drone Autonomy, connectedTo, Autonomous Flight>
+<AI for Drone Autonomy, connectedTo, Communication Systems>
+<AI for Drone Autonomy, connectedTo, Drone Design>
+<AI for Drone Autonomy, connectedTo, Drone Maintenance>
+<AI for Drone Autonomy, connectedTo, Ground Control Station Development>
+<AI for Drone Autonomy, connectedTo, Payload Integration>
+<AI for Drone Autonomy, connectedTo, Remote Piloting Training>
+<Aerial Photography, connectedTo, Geofencing Implementation>
+<Aerial Photography, partOf, Aerial Photography>
+<Autonomous Flight, connectedTo, Drone Maintenance>
+<Autonomous Flight, connectedTo, Propeller Design>
+<Collision Avoidance Systems, connectedTo, Thermal Imaging with Drones>
+<Communication Systems, connectedTo, Payload Integration>
+<Data Processing from Drones, connectedTo, Aerial Photography>
+<Data Processing from Drones, connectedTo, Drone Design>
+<Drone Data Security, connectedTo, Data Processing from Drones>
+<Drone Delivery Logistics, connectedTo, Drone Maintenance>
+<Drone Delivery Logistics, connectedTo, Search and Rescue Operations>
+<Drone Delivery Logistics, connectedTo, Swarm Robotics for Drones>
+<Drone Design, connectedTo, Remote Piloting Training>
+<Drone Maintenance, maps, Flight Control System>
+<Ethical Drone Use, connectedTo, Ground Control Station Development>
+<Flight Control System, connectedTo, Drone Data Security>
+<Flight Planning Software, connectedTo, Videography>
+<Flight Planning Software, partOf, Flight Planning Software>
+<Geofencing Implementation, connectedTo, Payload Integration>
+<Geofencing Implementation, partOf, Geofencing Implementation>
+<Ground Control Station Development, connectedTo, Collision Avoidance Systems>
+<Mapping and Surveying, connectedTo, Ethical Drone Use>
+<Mapping and Surveying, connectedTo, Ground Control Station Development>
+<Payload Integration, connectedTo, Mapping and Surveying>
+<Propeller Design, connectedTo, Drone Delivery Logistics>
+<Propeller Design, connectedTo, Drone Maintenance>
+<Remote Piloting Training, connectedTo, Communication Systems>
+<Search and Rescue Operations, connectedTo, Flight Planning Software>
+<Search and Rescue Operations, partOf, Search and Rescue Operations>
+<Swarm Robotics for Drones, connectedTo, Drone Maintenance>
+<Thermal Imaging with Drones, connectedTo, Navigation System>
+<Videography, connectedTo, Remote Piloting Training>
+<Videography, partOf, Videography>
diff --git a/test/graphviz/scanned_medium/graphviz_33.txt b/test/graphviz/scanned_medium/graphviz_33.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7b6d6ff0571bbcf1d46008c5a4f370ed02c800de
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_33.txt
@@ -0,0 +1,13 @@
+<Candidate Sourcing, connectedTo, Employee Relations>
+<Candidate Sourcing, connectedTo, HR Information System Implementation>
+<Compensation and Benefits, recruits, Organizational Development>
+<Conflict Resolution, connectedTo, HR Information System Implementation>
+<Employee Relations, retains, Conflict Resolution>
+<Global Mobility Programs, reports, Talent Management>
+<Grievance Handling, complies, Compensation and Benefits>
+<HR Information System Implementation, supports, Team Building Activities>
+<Onboarding Process, connectedTo, Candidate Sourcing>
+<Organizational Development, evaluates, Onboarding Process>
+<Talent Management, connectedTo, Grievance Handling>
+<Talent Management, leads, Candidate Sourcing>
+<Team Building Activities, mediates, Union Negotiations>
diff --git a/test/graphviz/scanned_medium/graphviz_330.txt b/test/graphviz/scanned_medium/graphviz_330.txt
new file mode 100644
index 0000000000000000000000000000000000000000..251fef393df1ae22a2e3ca64aa85c4171c0a7bc2
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_330.txt
@@ -0,0 +1,43 @@
+<Adaptive Cruise Control, connectedTo, Cloud Connectivity for AVs>
+<Adaptive Cruise Control, connectedTo, Lane Keeping Assist>
+<Automatic Emergency Braking, regulates, Adaptive Cruise Control>
+<Battery Management for EVs, connectedTo, Edge Computing for AVs>
+<Battery Management for EVs, partOf, Battery Management for EVs>
+<Charging Infrastructure, connectedTo, Object Detection and Classification>
+<Cloud Connectivity for AVs, connectedTo, Motion Control>
+<Cloud Connectivity for AVs, partOf, Cloud Connectivity for AVs>
+<Decision_Making Algorithms, connectedTo, Remote Operation Capability>
+<Decision_Making Algorithms, updates, Redundancy in Sensors>
+<Driver Monitoring Systems, connectedTo, Edge Computing for AVs>
+<Edge Computing for AVs, connectedTo, Over_the_Air Updates>
+<Fail_Safe Systems, connectedTo, Insurance Models for AVs>
+<Hardware Design, connectedTo, Battery Management for EVs>
+<Hardware Design, partOf, Hardware Design>
+<Human_Machine Interface, connectedTo, Public Acceptance and Trust>
+<Lane Keeping Assist, connectedTo, Charging Infrastructure>
+<Localization and Mapping, connectedTo, Decision_Making Algorithms>
+<Motion Control, connectedTo, Hardware Design>
+<Motion Control, partOf, Motion Control>
+<Object Detection and Classification, connectedTo, Vehicle_to_Vehicle Communication>
+<Over_the_Air Updates, connectedTo, Fail_Safe Systems>
+<Over_the_Air Updates, connectedTo, Insurance Models for AVs>
+<Over_the_Air Updates, connectedTo, Localization and Mapping>
+<Over_the_Air Updates, connectedTo, Parking Assistance Systems>
+<Over_the_Air Updates, connectedTo, Regulatory Compliance>
+<Parking Assistance Systems, connectedTo, Decision_Making Algorithms>
+<Parking Assistance Systems, connectedTo, Fail_Safe Systems>
+<Parking Assistance Systems, connectedTo, Insurance Models for AVs>
+<Parking Assistance Systems, connectedTo, Redundancy in Sensors>
+<Parking Assistance Systems, connectedTo, Regulatory Compliance>
+<Parking Assistance Systems, fuels, Fail_Safe Systems>
+<Path Planning, connectedTo, Parking Assistance Systems>
+<Path Planning, partOf, Path Planning>
+<Public Acceptance and Trust, connectedTo, Automatic Emergency Braking>
+<Redundancy in Sensors, connectedTo, Decision_Making Algorithms>
+<Redundancy in Sensors, connectedTo, Fail_Safe Systems>
+<Regulatory Compliance, connectedTo, Localization and Mapping>
+<Remote Operation Capability, connectedTo, Path Planning>
+<Remote Operation Capability, partOf, Remote Operation Capability>
+<Simulation and Testing, connectedTo, Human_Machine Interface>
+<Software Development, connectedTo, Simulation and Testing>
+<Vehicle_to_Vehicle Communication, connectedTo, Driver Monitoring Systems>
diff --git a/test/graphviz/scanned_medium/graphviz_331.txt b/test/graphviz/scanned_medium/graphviz_331.txt
new file mode 100644
index 0000000000000000000000000000000000000000..82b16019b3152fe90e703166b42d6605fe67b171
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_331.txt
@@ -0,0 +1,29 @@
+<Bike_sharing Services, connectedTo, Parking Integration>
+<Car_sharing Services, connectedTo, Supply_Demand Balancing>
+<Driver Management, connectedTo, Supply_Demand Balancing>
+<Driver Management, connectedTo, Ticketing and Fare Collection>
+<Driver Management, connectedTo, Vehicle Location Tracking>
+<Dynamic Pricing, connectedTo, User Registration>
+<Dynamic Pricing, partOf, Dynamic Pricing>
+<Insurance Models, connectedTo, Vehicle Location Tracking>
+<Insurance Models, partOf, Insurance Models>
+<Parking Integration, connectedTo, Car_sharing Services>
+<Parking Integration, connectedTo, Dynamic Pricing>
+<Payment Processing, connectedTo, Insurance Models>
+<Payment Processing, partOf, Payment Processing>
+<Public Transit Integration, connectedTo, Vehicle Location Tracking>
+<Public Transit Integration, partOf, Public Transit Integration>
+<Public_Private Partnerships, connectedTo, Payment Processing>
+<Public_Private Partnerships, partOf, Public_Private Partnerships>
+<Regulatory Compliance, connectedTo, Bike_sharing Services>
+<Ticketing and Fare Collection, connectedTo, Bike_sharing Services>
+<Ticketing and Fare Collection, connectedTo, Car_sharing Services>
+<Ticketing and Fare Collection, connectedTo, Parking Integration>
+<Ticketing and Fare Collection, connectedTo, Regulatory Compliance>
+<Ticketing and Fare Collection, connectedTo, Supply_Demand Balancing>
+<Ticketing and Fare Collection, connectedTo, User Rating and Feedback Systems>
+<User Rating and Feedback Systems, connectedTo, Public_Private Partnerships>
+<User Rating and Feedback Systems, partOf, User Rating and Feedback Systems>
+<User Registration, connectedTo, Public Transit Integration>
+<User Registration, partOf, User Registration>
+<Vehicle Location Tracking, connectedTo, Ticketing and Fare Collection>
diff --git a/test/graphviz/scanned_medium/graphviz_334.txt b/test/graphviz/scanned_medium/graphviz_334.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ae2812be6f706b9bf0562529380ba385ebf2379e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_334.txt
@@ -0,0 +1,41 @@
+<Accessibility Features, connectedTo, Zero_Knowledge Proofs for Privacy>
+<Auditability, connectedTo, Optical Scan Systems>
+<Auditability, connectedTo, Software Integrity Checks>
+<Auditability, connectedTo, Touchscreen Voting Machines>
+<Ballot Creation, connectedTo, Voting Machine Design>
+<Biometric Voter ID, connectedTo, Voter Registration>
+<Biometric Voter ID, partOf, Biometric Voter ID>
+<Hardware Tamper Detection, connectedTo, Software Integrity Checks>
+<Hardware Tamper Detection, connectedTo, Transparency>
+<Legal Framework Compliance, connectedTo, Voter Education Programs>
+<Online Voting Systems, connectedTo, Accessibility Features>
+<Optical Scan Systems, connectedTo, Accessibility Features>
+<Optical Scan Systems, connectedTo, Legal Framework Compliance>
+<Optical Scan Systems, connectedTo, Results Aggregation>
+<Optical Scan Systems, connectedTo, Secure Data Transmission>
+<Optical Scan Systems, connectedTo, Voter Education Programs>
+<Remote Voting Solutions, partOf, Remote Voting Solutions>
+<Remote Voting Solutions, stores, Voting Machine Design>
+<Results Aggregation, connectedTo, Voter Registration>
+<Risk Management for Elections, ensures, Vote Counting>
+<Risk Management for Elections, partOf, Risk Management for Elections>
+<Secure Data Transmission, connectedTo, Online Voting Systems>
+<Security Protocols, connectedTo, Risk Management for Elections>
+<Security Protocols, connectedTo, Software Integrity Checks>
+<Security Protocols, implements, Online Voting Systems>
+<Software Integrity Checks, connectedTo, Online Voting Systems>
+<Software Integrity Checks, upgrades, Optical Scan Systems>
+<Threat Modeling, connectedTo, Remote Voting Solutions>
+<Threat Modeling, partOf, Threat Modeling>
+<Touchscreen Voting Machines, connectedTo, Hardware Tamper Detection>
+<Touchscreen Voting Machines, connectedTo, Optical Scan Systems>
+<Transparency, certifies, Security Protocols>
+<Transparency, connectedTo, Optical Scan Systems>
+<Transparency, connectedTo, Threat Modeling>
+<Undue Influence Prevention, connectedTo, Biometric Voter ID>
+<Undue Influence Prevention, partOf, Undue Influence Prevention>
+<Vote Counting, connectedTo, Undue Influence Prevention>
+<Vote Counting, partOf, Vote Counting>
+<Voter Education Programs, connectedTo, Secure Data Transmission>
+<Voter Registration, connectedTo, Ballot Creation>
+<Zero_Knowledge Proofs for Privacy, connectedTo, Results Aggregation>
diff --git a/test/graphviz/scanned_medium/graphviz_335.dot b/test/graphviz/scanned_medium/graphviz_335.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f40b635c6ffc30416c5cb6a43f9674a9bbe0b985
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_335.dot
@@ -0,0 +1,80 @@
+digraph {
+	rankdir=RL
+	N0 [label="Report Drafting" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
+	N1 [label="Advocacy Strategy" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
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+	N4 [label="Problem Identification" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Forecasting and Scenario Planning" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
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+	N9 [label="Public Consultation Process" color="#FFB74D" fillcolor="#FFF3E0" shape=box style=filled]
+	N10 [label="Ethical Considerations" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N11 [label="Policy Simulation Models" color="#FFB74D" fillcolor="#FFF3E0" shape=ellipse style=filled]
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+	M2 [label="" color="#FFF176" fillcolor="#FFFDE7" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
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+		nest0_0 [label="Comparative Policy Analysis" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
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+		nest1_2 [label="Interagency Coordination" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
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+		nest1_1 -> nest1_2 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
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+}
diff --git a/test/graphviz/scanned_medium/graphviz_335.txt b/test/graphviz/scanned_medium/graphviz_335.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e7e5ea09b65cdff64952b3d4ff4df80047f51ecb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_335.txt
@@ -0,0 +1,42 @@
+<Advocacy Strategy, connectedTo, Policy Advocacy and Lobbying>
+<Advocacy Strategy, connectedTo, Problem Identification>
+<Budgetary Implications, connectedTo, Advocacy Strategy>
+<Budgetary Implications, partOf, Budgetary Implications>
+<Communication Strategy, connectedTo, Interagency Coordination>
+<Communication Strategy, partOf, Communication Strategy>
+<Comparative Policy Analysis, connectedTo, Qualitative Analysis>
+<Comparative Policy Analysis, partOf, Comparative Policy Analysis>
+<Ethical Considerations, connectedTo, Comparative Policy Analysis>
+<Ethical Considerations, connectedTo, Policy Simulation Models>
+<Forecasting and Scenario Planning, connectedTo, Ethical Considerations>
+<Forecasting and Scenario Planning, connectedTo, Presentation Skills>
+<Forecasting and Scenario Planning, connectedTo, Public Consultation Process>
+<Forecasting and Scenario Planning, connectedTo, Recommendation Formulation>
+<Implementation Plan Development, connectedTo, Budgetary Implications>
+<Implementation Plan Development, partOf, Implementation Plan Development>
+<Interagency Coordination, connectedTo, Regulatory Impact Assessment>
+<Interagency Coordination, partOf, Interagency Coordination>
+<Option Generation, connectedTo, Ethical Considerations>
+<Option Generation, connectedTo, Policy Brief Writing>
+<Option Generation, connectedTo, Presentation Skills>
+<Option Generation, connectedTo, Problem Identification>
+<Option Generation, connectedTo, Public Consultation Process>
+<Option Generation, connectedTo, Recommendation Formulation>
+<Policy Advocacy and Lobbying, connectedTo, Option Generation>
+<Policy Brief Writing, connectedTo, Presentation Skills>
+<Political Feasibility Assessment, connectedTo, Communication Strategy>
+<Political Feasibility Assessment, partOf, Political Feasibility Assessment>
+<Presentation Skills, connectedTo, Public Consultation Process>
+<Problem Identification, connectedTo, Public Consultation Process>
+<Problem Identification, connectedTo, Recommendation Formulation>
+<Problem Identification, ethics, Forecasting and Scenario Planning>
+<Public Consultation Process, connectedTo, Ethical Considerations>
+<Public Consultation Process, connectedTo, Political Feasibility Assessment>
+<Qualitative Analysis, connectedTo, Implementation Plan Development>
+<Qualitative Analysis, partOf, Qualitative Analysis>
+<Recommendation Formulation, connectedTo, Policy Brief Writing>
+<Regulatory Impact Assessment, connectedTo, Advocacy Strategy>
+<Regulatory Impact Assessment, partOf, Regulatory Impact Assessment>
+<Report Drafting, connectedTo, Advocacy Strategy>
+<Report Drafting, connectedTo, Problem Identification>
+<Report Drafting, connectedTo, Recommendation Formulation>
diff --git a/test/graphviz/scanned_medium/graphviz_336.dot b/test/graphviz/scanned_medium/graphviz_336.dot
new file mode 100644
index 0000000000000000000000000000000000000000..07aab72f152fd3ffd7f1987670587699150fb6a3
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_336.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=BT
+	N0 [label="Journal Publication" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N1 [label="Software for Statistical Analysis" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N2 [label="Literature Review" color="#CFCFCF" fillcolor="#F6F6F6" shape=box style=filled]
+	N3 [label="Power Analysis" color="#7E57C2" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
+	N4 [label="Funding Agency Reporting" color="#7E57C2" fillcolor="#EDE7F6" shape=Mdiamond style=filled]
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+	N6 [label="Theory Development" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N7 [label="Poster Session Preparation" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N8 [label="Research Ethics Application" color="#CFCFCF" fillcolor="#F6F6F6" shape=ellipse style=filled]
+	N9 [label="Manuscript Writing" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
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+}
diff --git a/test/graphviz/scanned_medium/graphviz_336.txt b/test/graphviz/scanned_medium/graphviz_336.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6a8dfb0c60e805f87cfb2cf3c43e5c41befa51c6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_336.txt
@@ -0,0 +1,34 @@
+<Citation Management, connectedTo, Data Collection>
+<Citation Management, partOf, Citation Management>
+<Data Collection, connectedTo, Literature Review>
+<Data Collection, partOf, Data Collection>
+<Experiment Design, connectedTo, Power Analysis>
+<Experiment Design, partOf, Experiment Design>
+<Funding Agency Reporting, connectedTo, Survey Design>
+<Journal Publication, connectedTo, Poster Session Preparation>
+<Journal Publication, edits, Software for Statistical Analysis>
+<Literature Review, connectedTo, Poster Session Preparation>
+<Literature Review, connectedTo, Power Analysis>
+<Model Building, connectedTo, Citation Management>
+<Model Building, partOf, Model Building>
+<Poster Session Preparation, develops, Research Ethics Application>
+<Power Analysis, connectedTo, Funding Agency Reporting>
+<Power Analysis, connectedTo, Manuscript Writing>
+<Power Analysis, connectedTo, Model Building>
+<Power Analysis, connectedTo, Poster Session Preparation>
+<Power Analysis, connectedTo, Research Ethics Application>
+<Power Analysis, connectedTo, Theory Development>
+<Qualitative Analysis, connectedTo, Experiment Design>
+<Qualitative Analysis, partOf, Qualitative Analysis>
+<Research Ethics Application, connectedTo, Manuscript Writing>
+<Research Impact Assessment, connectedTo, Variable Identification>
+<Research Impact Assessment, partOf, Research Impact Assessment>
+<Software for Statistical Analysis, connectedTo, Literature Review>
+<Survey Design, connectedTo, Manuscript Writing>
+<Survey Design, connectedTo, Poster Session Preparation>
+<Survey Design, connectedTo, Research Ethics Application>
+<Survey Design, connectedTo, Research Impact Assessment>
+<Survey Design, connectedTo, Theory Development>
+<Theory Development, connectedTo, Poster Session Preparation>
+<Variable Identification, partOf, Variable Identification>
+<Variable Identification, patents, Qualitative Analysis>
diff --git a/test/graphviz/scanned_medium/graphviz_34.dot b/test/graphviz/scanned_medium/graphviz_34.dot
new file mode 100644
index 0000000000000000000000000000000000000000..e6fc9f4eba19aa2135740f2ea7e8121a60e02445
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_34.dot
@@ -0,0 +1,26 @@
+digraph {
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+	N9 -> N10 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N2 [label=automates color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N2 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_34.txt b/test/graphviz/scanned_medium/graphviz_34.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4e0300f93990e366583bc2ffc76bff13ce663ac0
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_34.txt
@@ -0,0 +1,12 @@
+<AI in Recruitment, automates, Recruitment Marketing>
+<Candidate Feedback Collection, posts, Candidate Tracking>
+<Candidate Tracking, refers, Recruitment Metrics Reporting>
+<Competency_Based Interviewing, complies, Recruitment Marketing>
+<Compliance in Hiring, sources, Video Interviewing>
+<Executive Search, consults, Competency_Based Interviewing>
+<Headhunting, connectedTo, Candidate Feedback Collection>
+<Recruitment Marketing, connectedTo, Compliance in Hiring>
+<Recruitment Marketing, connectedTo, Reference Checking>
+<Recruitment Metrics Reporting, connectedTo, Compliance in Hiring>
+<Reference Checking, connectedTo, Headhunting>
+<Video Interviewing, connectedTo, AI in Recruitment>
diff --git a/test/graphviz/scanned_medium/graphviz_340.dot b/test/graphviz/scanned_medium/graphviz_340.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dd560ca2c2568f459c6114e2707ae4c14c7dbf1b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_340.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Compliance Hotlines" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N1 [label="Internal Investigations" color="#E0E0E0" fillcolor="#EBEBEB" shape=box style=filled]
+	N2 [label="Monitoring and Enforcement" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N3 [label="Incident Response Planning" color="#E0E0E0" fillcolor="#EBEBEB" shape=octagon style=filled]
+	N4 [label="Legal Advisory" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N5 [label="Code of Conduct Implementation" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N6 [label="Ethical AI Guidelines" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N7 [label="ESG Integration" color="#E0E0E0" fillcolor="#EBEBEB" shape=folder style=filled]
+	N8 [label="Ethics Committee Formation" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+	N9 [label="CSR Reporting" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N10 [label="Compliance Training" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	S0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#E0E0E0" fillcolor="#EBEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#92C79A" fillcolor="#E8F0EA" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Compliance Software Implementation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Conflict of Interest Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+		nest0_1 [label="Data Privacy Compliance" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+		nest0_2 [label="Financial Regulations Compliance" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+		nest0_3 [label="Supplier Code of Conduct" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [label=protects color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Regulatory Interpretation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Consumer Protection Compliance" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+		nest1_1 [label="Risk Assessment" color="#EAEFA5" fillcolor="#FDFCEB" shape=octagon style=filled]
+		nest1_2 [label="Anti_Money Laundering Compliance" color="#E0E0E0" fillcolor="#EBEBEB" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=monitors color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=establishes color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=detects color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=licenses color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N7 -> nest0_0 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	nest0_3 -> N2 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> nest1_0 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	nest1_2 -> N6 [color="#92C79A" dir=forward penwidth=1.5 style=dashed]
+	N5 -> S0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N8 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N9 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N7 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> S1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	N4 -> M0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M0 [color="#E0E0E0" dir=forward penwidth=1.5 style=dashed]
+	M0 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N0 -> M1 [color="#E0E0E0" dir=forward penwidth=1.5 style=solid]
+	M1 -> N3 [color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_340.txt b/test/graphviz/scanned_medium/graphviz_340.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d39a28272e3afb51c2949c61fcd25e487c90f06d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_340.txt
@@ -0,0 +1,35 @@
+<Anti_Money Laundering Compliance, connectedTo, Ethical AI Guidelines>
+<Anti_Money Laundering Compliance, partOf, Anti_Money Laundering Compliance>
+<CSR Reporting, licenses, Compliance Training>
+<Code of Conduct Implementation, connectedTo, CSR Reporting>
+<Code of Conduct Implementation, connectedTo, Compliance Training>
+<Code of Conduct Implementation, connectedTo, ESG Integration>
+<Code of Conduct Implementation, connectedTo, Ethical AI Guidelines>
+<Code of Conduct Implementation, connectedTo, Ethics Committee Formation>
+<Compliance Hotlines, connectedTo, Ethics Committee Formation>
+<Compliance Hotlines, connectedTo, Incident Response Planning>
+<Compliance Hotlines, monitors, Internal Investigations>
+<Conflict of Interest Management, connectedTo, Data Privacy Compliance>
+<Conflict of Interest Management, partOf, Conflict of Interest Management>
+<Consumer Protection Compliance, connectedTo, Risk Assessment>
+<Consumer Protection Compliance, partOf, Consumer Protection Compliance>
+<Data Privacy Compliance, connectedTo, Financial Regulations Compliance>
+<Data Privacy Compliance, partOf, Data Privacy Compliance>
+<ESG Integration, connectedTo, Conflict of Interest Management>
+<ESG Integration, detects, Ethics Committee Formation>
+<Ethical AI Guidelines, establishes, ESG Integration>
+<Ethics Committee Formation, connectedTo, CSR Reporting>
+<Ethics Committee Formation, connectedTo, Consumer Protection Compliance>
+<Financial Regulations Compliance, partOf, Financial Regulations Compliance>
+<Financial Regulations Compliance, protects, Supplier Code of Conduct>
+<Incident Response Planning, connectedTo, Legal Advisory>
+<Internal Investigations, connectedTo, Incident Response Planning>
+<Internal Investigations, connectedTo, Monitoring and Enforcement>
+<Legal Advisory, connectedTo, Code of Conduct Implementation>
+<Legal Advisory, connectedTo, Ethical AI Guidelines>
+<Monitoring and Enforcement, connectedTo, Ethical AI Guidelines>
+<Monitoring and Enforcement, connectedTo, Incident Response Planning>
+<Risk Assessment, connectedTo, Anti_Money Laundering Compliance>
+<Risk Assessment, partOf, Risk Assessment>
+<Supplier Code of Conduct, connectedTo, Monitoring and Enforcement>
+<Supplier Code of Conduct, partOf, Supplier Code of Conduct>
diff --git a/test/graphviz/scanned_medium/graphviz_343.dot b/test/graphviz/scanned_medium/graphviz_343.dot
new file mode 100644
index 0000000000000000000000000000000000000000..4f28d8041fe222a059dd7af803b7934154314320
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_343.dot
@@ -0,0 +1,66 @@
+digraph {
+	rankdir=TD
+	N0 [label="Predictive Policing" color="#FFC2C2" fillcolor="#FFEBEB" shape=ellipse style=filled]
+	N1 [label="Drone Surveillance" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+	N2 [label="Anomaly Detection" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N3 [label="Asset Tracking" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	N4 [label="Facial Recognition Systems" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N5 [label="Security Personnel Operations" color="#FFC2C2" fillcolor="#FFEBEB" shape=oval style=filled]
+	N6 [label="Ethical Guidelines" color="#B8C0F5" fillcolor="#ECF0FD" shape=parallelogram style=filled]
+	N7 [label="Industrial Surveillance" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+	N8 [label="Environmental Monitoring" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+	N9 [label="Pattern Recognition" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N10 [label="Data Storage and Retention" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	S0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#CD8FF2" fillcolor="#ECCFF5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFC2C2" fillcolor="#FFEBEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#B8C0F5" fillcolor="#ECF0FD" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Network Monitoring" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Audio Surveillance" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+		nest0_1 [label="Privacy Concerns Mitigation" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Sensor Network Deployment" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Biometric Data Analysis" color="#FFC2C2" fillcolor="#FFEBEB" shape=box style=filled]
+		nest1_1 [label="Wildlife Tracking" color="#CD8FF2" fillcolor="#ECCFF5" shape=oval style=filled]
+		nest1_2 [label="Access Control Systems" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest1_1 -> nest1_2 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> nest0_0 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N4 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> nest1_0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	nest1_2 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> S0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	S0 -> N7 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S0 -> N5 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> S1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	S1 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	N0 -> M0 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	M0 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> M1 [color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#FFC2C2" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N2 -> M2 [label=tracks color="#B8C0F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#FFC2C2" dir=forward penwidth=1.5 style=solid]
+	M2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_344.txt b/test/graphviz/scanned_medium/graphviz_344.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e2b280258a47ae46c4bbc010c849650cb4a87721
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_344.txt
@@ -0,0 +1,44 @@
+<Behavioral Science in Prevention, connectedTo, Sexual Assault Prevention>
+<Burglary Prevention, connectedTo, Environmental Design>
+<Burglary Prevention, partOf, Burglary Prevention>
+<Community Policing, connectedTo, Reintegration Programs>
+<Conflict Resolution Training, connectedTo, Community Policing>
+<Conflict Resolution Training, connectedTo, Crisis Intervention>
+<Conflict Resolution Training, connectedTo, Sexual Assault Prevention>
+<Crime Data Analysis, connectedTo, Crisis Intervention>
+<Crime Data Analysis, connectedTo, Data Sharing Initiatives>
+<Crime Data Analysis, connectedTo, Target Hardening>
+<Crime Prevention Through Education, connectedTo, Patrol Operations>
+<Crime Prevention Through Education, partOf, Crime Prevention Through Education>
+<Crisis Intervention, connectedTo, Domestic Violence Prevention>
+<Cybercrime Prevention, connectedTo, Environmental Design>
+<Cybercrime Prevention, connectedTo, Law Enforcement Training>
+<Data Sharing Initiatives, connectedTo, Crisis Intervention>
+<Data Sharing Initiatives, connectedTo, Environmental Design>
+<Data Sharing Initiatives, connectedTo, Restorative Justice>
+<Data Sharing Initiatives, connectedTo, Sexual Assault Prevention>
+<Domestic Violence Prevention, connectedTo, Neighborhood Watch Programs>
+<Domestic Violence Prevention, connectedTo, Rehabilitation Programs>
+<Domestic Violence Prevention, connectedTo, Sexual Assault Prevention>
+<Drug Prevention Initiatives, connectedTo, Burglary Prevention>
+<Drug Prevention Initiatives, partOf, Drug Prevention Initiatives>
+<Environmental Design, connectedTo, Behavioral Science in Prevention>
+<Law Enforcement Training, investigates, Environmental Design>
+<Neighborhood Watch Programs, connectedTo, Cybercrime Prevention>
+<Patrol Operations, hotspots, Public Awareness Campaigns>
+<Patrol Operations, partOf, Patrol Operations>
+<Public Awareness Campaigns, connectedTo, Cybercrime Prevention>
+<Public Awareness Campaigns, partOf, Public Awareness Campaigns>
+<Rehabilitation Programs, connectedTo, Crime Prevention Through Education>
+<Rehabilitation Programs, partOf, Rehabilitation Programs>
+<Reintegration Programs, patrols, Crisis Intervention>
+<Restorative Justice, connectedTo, Conflict Resolution Training>
+<Restorative Justice, connectedTo, Victim Support Services>
+<Security Lighting, connectedTo, Crime Data Analysis>
+<Security Lighting, connectedTo, Crisis Intervention>
+<Security Lighting, reduces, Conflict Resolution Training>
+<Sexual Assault Prevention, connectedTo, Target Hardening>
+<Situational Crime Prevention, connectedTo, Police_Community Relations>
+<Target Hardening, connectedTo, Situational Crime Prevention>
+<Victim Support Services, connectedTo, Drug Prevention Initiatives>
+<Victim Support Services, partOf, Victim Support Services>
diff --git a/test/graphviz/scanned_medium/graphviz_345.txt b/test/graphviz/scanned_medium/graphviz_345.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a8b4dfa61a26ba7baffceb86b5530b88e0c78329
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_345.txt
@@ -0,0 +1,38 @@
+<Anti_Poaching Operations, connectedTo, Marine Conservation>
+<Anti_Poaching Operations, connectedTo, Satellite Tracking of Animals>
+<Anti_Poaching Operations, species_saves, Wetland Restoration>
+<Climate Change Adaptation for Wildlife, connectedTo, Anti_Poaching Operations>
+<Community Engagement, connectedTo, Conservation Education>
+<Community Engagement, connectedTo, Forestry Practices for Conservation>
+<Community Engagement, connectedTo, Rewilding Initiatives>
+<Community Engagement, connectedTo, Wetland Restoration>
+<Conservation Education, connectedTo, Wetland Restoration>
+<Data Management for Conservation, connectedTo, Climate Change Adaptation for Wildlife>
+<Data Management for Conservation, partOf, Data Management for Conservation>
+<Ecotourism Management, connectedTo, Marine Conservation>
+<Ecotourism Management, partOf, Ecotourism Management>
+<Forestry Practices for Conservation, connectedTo, Protected Area Management>
+<Forestry Practices for Conservation, connectedTo, Wetland Restoration>
+<Habitat Restoration, connectedTo, Data Management for Conservation>
+<Habitat Restoration, partOf, Habitat Restoration>
+<Human_Wildlife Conflict Mitigation, connectedTo, Wildlife Rescue and Rehabilitation>
+<Human_Wildlife Conflict Mitigation, partOf, Human_Wildlife Conflict Mitigation>
+<Law Enforcement, connectedTo, Habitat Restoration>
+<Law Enforcement, partOf, Law Enforcement>
+<Marine Conservation, connectedTo, Community Engagement>
+<Marine Conservation, connectedTo, Forestry Practices for Conservation>
+<Marine Conservation, connectedTo, Law Enforcement>
+<Marine Conservation, connectedTo, Protected Area Management>
+<Policy Advocacy, connectedTo, Human_Wildlife Conflict Mitigation>
+<Policy Advocacy, connectedTo, Research and Development in Conservation>
+<Policy Advocacy, connectedTo, Wetland Restoration>
+<Pollution Impact Assessment, connectedTo, Forestry Practices for Conservation>
+<Pollution Impact Assessment, connectedTo, Policy Advocacy>
+<Protected Area Management, connectedTo, Rewilding Initiatives>
+<Research and Development in Conservation, connectedTo, Climate Change Adaptation for Wildlife>
+<Rewilding Initiatives, connectedTo, Conservation Education>
+<Sustainable Resource Management, connectedTo, Ecotourism Management>
+<Sustainable Resource Management, partOf, Sustainable Resource Management>
+<Wetland Restoration, connectedTo, Satellite Tracking of Animals>
+<Wildlife Rescue and Rehabilitation, connectedTo, Sustainable Resource Management>
+<Wildlife Rescue and Rehabilitation, partOf, Wildlife Rescue and Rehabilitation>
diff --git a/test/graphviz/scanned_medium/graphviz_346.dot b/test/graphviz/scanned_medium/graphviz_346.dot
new file mode 100644
index 0000000000000000000000000000000000000000..324b541001795a3f64c6f5fb20bc3ae3ae3afb54
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_346.dot
@@ -0,0 +1,73 @@
+digraph {
+	rankdir=BT
+	N0 [label="Biological Oceanography" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N1 [label="Sea Level Monitoring" color="#4CAF50" fillcolor="#C8E6C9" shape=octagon style=filled]
+	N2 [label="Ocean Temperature Sensing" color="#FFC107" fillcolor="#FFECB3" shape=parallelogram style=filled]
+	N3 [label="Fisheries Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=hexagon style=filled]
+	N4 [label="Chemical Oceanography" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N5 [label="Polar Oceanography" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N6 [label="Ocean Renewable Energy" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N7 [label="Coastal Erosion Research" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N8 [label="Physical Oceanography" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N9 [label="Climate Change Impact Study" color="#4CAF50" fillcolor="#C8E6C9" shape=hexagon style=filled]
+	N10 [label="Ocean Data Archiving" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N11 [label="Marine Biodiversity Assessment" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	N12 [label="Ocean Carbon Cycle" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N13 [label="Satellite Oceanography" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N14 [label="Underwater Acoustics" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N15 [label="Marine Hazards Assessment" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N16 [label="Hydrothermal Vent Exploration" color="#FFEB3B" fillcolor="#FFF9C4" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#4CAF50" fillcolor="#C8E6C9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#EDE7F6" fontname=Helvetica fontsize=10 label="Ocean Acidification Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Marine Protected Area Planning" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+		nest0_1 [label="Marine Life Observation" color="#FFC107" fillcolor="#FFECB3" shape=oval style=filled]
+		nest0_0 -> nest0_1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Acoustic Oceanography" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Plastic Pollution Research" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+		nest1_1 [label="Data Visualization" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+		nest1_0 -> nest1_1 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [label=tides color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
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+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
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+	N6 -> N7 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [label=processes_images color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N15 -> N16 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest0_0 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	nest0_1 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> nest1_0 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N10 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> S0 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	S0 -> N13 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N15 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S0 -> N14 [label=studies color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N6 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N8 [label=maps color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N16 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	S1 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> M1 [color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N1 -> M1 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [label=maintains_buoys color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N12 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N7 -> M2 [color="#FFEB3B" dir=forward penwidth=1.5 style=solid]
+	M2 -> N9 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_35.txt b/test/graphviz/scanned_medium/graphviz_35.txt
new file mode 100644
index 0000000000000000000000000000000000000000..87032f019568bf6d3955506c1abeaecbf253e27e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_35.txt
@@ -0,0 +1,11 @@
+<Account Management, monitors, Proactive Communication>
+<Complaint Resolution, connectedTo, Customer Journey Mapping>
+<Complaint Resolution, retains, Customer Retention Strategies>
+<Customer Journey Mapping, connectedTo, FAQ Management>
+<Customer Retention Strategies, connectedTo, Complaint Resolution>
+<Email Support, answers, FAQ Management>
+<Email Support, troubleshoots, Account Management>
+<Multilingual Support, connectedTo, Customer Retention Strategies>
+<Proactive Communication, exchanges, Sentiment Analysis>
+<Self_Service Portal Management, connectedTo, Multilingual Support>
+<Sentiment Analysis, connectedTo, Self_Service Portal Management>
diff --git a/test/graphviz/scanned_medium/graphviz_352.txt b/test/graphviz/scanned_medium/graphviz_352.txt
new file mode 100644
index 0000000000000000000000000000000000000000..414efbdef0ee31232aed722c7cfdd6f3be77141e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_352.txt
@@ -0,0 +1,37 @@
+<API Automation, BPM_utilizes, Automated Testing>
+<API Automation, connectedTo, Business Rule Engines>
+<API Automation, connectedTo, Process Mining>
+<API Automation, connectedTo, Robotic Process Automation Implementation>
+<Automated Testing, connectedTo, Customer Service Automation>
+<Automated Testing, connectedTo, Decision Automation>
+<Automated Testing, connectedTo, Process Mining>
+<Automated Testing, connectedTo, Robotic Process Automation Implementation>
+<Automation Opportunity Identification, connectedTo, Security for Automation Bots>
+<Business Process Management, connectedTo, Integration with Existing Systems>
+<Business Rule Engines, connectedTo, Process Mining>
+<Decision Automation, improves, Robotic Process Automation Implementation>
+<Decision Automation, maintains, Document Processing Automation>
+<Document Processing Automation, connectedTo, Performance Monitoring of Bots>
+<Document Processing Automation, partOf, Document Processing Automation>
+<Error Handling in Automation, connectedTo, Scripting for Automation>
+<Error Handling in Automation, partOf, Error Handling in Automation>
+<Finance Process Automation, connectedTo, Business Process Management>
+<IT Operations Automation, optimizes, Error Handling in Automation>
+<IT Operations Automation, partOf, IT Operations Automation>
+<Integration with Existing Systems, robots_deploys, API Automation>
+<Optical Character Recognition for Automation, connectedTo, Finance Process Automation>
+<Orchestration of Processes, upgrades, Automation Opportunity Identification>
+<Performance Monitoring of Bots, connectedTo, Automation Opportunity Identification>
+<Performance Monitoring of Bots, partOf, Performance Monitoring of Bots>
+<Process Mining, connectedTo, Customer Service Automation>
+<Robotic Process Automation Implementation, connectedTo, Business Rule Engines>
+<Scalability of Automation, connectedTo, Business Rule Engines>
+<Scalability of Automation, connectedTo, Supply Chain Automation>
+<Scripting for Automation, connectedTo, Workflow Automation Platforms>
+<Scripting for Automation, partOf, Scripting for Automation>
+<Security for Automation Bots, connectedTo, Scalability of Automation>
+<Supply Chain Automation, connectedTo, Business Rule Engines>
+<Supply Chain Automation, connectedTo, IT Operations Automation>
+<Supply Chain Automation, connectedTo, Optical Character Recognition for Automation>
+<Workflow Automation Platforms, connectedTo, Process Mining>
+<Workflow Automation Platforms, partOf, Workflow Automation Platforms>
diff --git a/test/graphviz/scanned_medium/graphviz_353.dot b/test/graphviz/scanned_medium/graphviz_353.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a99a4de82d6eae93ab6bfa32ed357fabbf0b777d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_353.dot
@@ -0,0 +1,85 @@
+digraph {
+	rankdir=LR
+	N0 [label="Trend Analysis" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Quality Management Systems" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N2 [label="Customer Feedback Analysis" color="#FFF8A6" fillcolor="#FFFDE0" shape=ellipse style=filled]
+	N3 [label="Total Quality Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+	N4 [label="ISO Certification" color="#EAEFA5" fillcolor="#FDFCEB" shape=parallelogram style=filled]
+	N5 [label="Process Monitoring" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Service Quality Management" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+	N7 [label="Corrective and Preventive Actions" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N8 [label="Non_Destructive Testing" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N9 [label=Metrology color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+	N10 [label="Lean Principles in Quality" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N11 [label="Quality Control Tools" color="#EAEFA5" fillcolor="#FDFCEB" shape=folder style=filled]
+	N12 [label="Audit Planning" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+	N13 [label="Quality Assurance" color="#DCE775" fillcolor="#F9FBE7" shape=diamond style=filled]
+	N14 [label="Automated Optical Inspection" color="#FFF8A6" fillcolor="#FFFDE0" shape=box style=filled]
+	N15 [label="Continuous Improvement" color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N16 [label="Risk_Based Quality Control" color="#FFF8A6" fillcolor="#FFFDE0" shape=parallelogram style=filled]
+	N17 [label="Quality Data Analysis" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N18 [label="Testing Methods" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N19 [label="Inspection Procedures" color="#DCE775" fillcolor="#F9FBE7" shape=box style=filled]
+	N20 [label="Statistical Process Control" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	S0 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#EAEFA5" fillcolor="#FDFCEB" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFF8A6" fillcolor="#FFFDE0" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Six Sigma Methodologies" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Food Safety Quality Control" color="#FFF8A6" fillcolor="#FFFDE0" shape=folder style=filled]
+		nest0_1 [label="Software Quality Assurance" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+		nest0_2 [label="Quality Standards Development" color="#EAEFA5" fillcolor="#FDFCEB" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Quality Planning" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Measurement System Analysis" color="#EAEFA5" fillcolor="#FDFCEB" shape=oval style=filled]
+		nest1_1 [label="Pharmaceutical Quality Control" color="#FFF8A6" fillcolor="#FFFDE0" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [label=inspects color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=improves color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=complies color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=collaborates color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N11 -> N12 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N13 -> N14 [color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N14 -> N15 [label=risk_manages color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
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+	N16 -> N17 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N17 -> N18 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N18 -> N19 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N19 -> N20 [color="#FFF8A6" dir=forward penwidth=1.5 style=solid]
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+	N6 -> M1 [color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	M1 -> N13 [color="#FFF8A6" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_354.dot b/test/graphviz/scanned_medium/graphviz_354.dot
new file mode 100644
index 0000000000000000000000000000000000000000..db2cdd2b08edd8c23e207f922a0d14b22565546e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_354.dot
@@ -0,0 +1,74 @@
+digraph {
+	rankdir=BT
+	N0 [label="Post_Go_Live Support" color="#BDAFA8" fillcolor="#E4E0DF" shape=ellipse style=filled]
+	N1 [label="Project Management" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
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+	N3 [label="Troubleshooting and Support" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
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+	N5 [label="Reporting and Analytics" color="#BA68C8" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N6 [label="System Upgrade" color="#FFEB3B" fillcolor="#FFF9C4" shape=plaintext style=filled]
+	N7 [label="Sales and Distribution" color="#FFEB3B" fillcolor="#FFF9C4" shape=Mdiamond style=filled]
+	N8 [label="Data Migration" color="#FFEB3B" fillcolor="#FFF9C4" shape=box style=filled]
+	N9 [label="Implementation Roadmap Development" color="#BDAFA8" fillcolor="#E4E0DF" shape=folder style=filled]
+	N10 [label="User Training" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N11 [label="Business Intelligence Integration" color="#BDAFA8" fillcolor="#E4E0DF" shape=box style=filled]
+	N12 [label="ERP Consulting" color="#BA68C8" fillcolor="#F3E5F5" shape=octagon style=filled]
+	N13 [label="Human Capital Management" color="#BA68C8" fillcolor="#F3E5F5" shape=box style=filled]
+	N14 [label="Integration with Other Systems" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N15 [label="Workflow Automation in ERP" color="#BA68C8" fillcolor="#F3E5F5" shape=ellipse style=filled]
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+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
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+	}
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+	M1 -> N14 [color="#BDAFA8" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_355.txt b/test/graphviz/scanned_medium/graphviz_355.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c13844813756c3031fd4727bceac366de40db9d6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_355.txt
@@ -0,0 +1,46 @@
+<Automated Farm Machinery, connectedTo, Variable Rate Application>
+<Automated Irrigation, connectedTo, Data Security in Agriculture>
+<Automated Irrigation, educates, Precision Farming>
+<Blockchain for Agri_Supply Chain, connectedTo, Automated Irrigation>
+<Blockchain for Agri_Supply Chain, connectedTo, Farm Management Software>
+<Connectivity Solutions, connectedTo, Yield Mapping>
+<Connectivity Solutions, partOf, Connectivity Solutions>
+<Data Security in Agriculture, connectedTo, Market Price Forecasting>
+<Data Security in Agriculture, livestock_raises, Satellite Imaging>
+<Drone Monitoring, connectedTo, Connectivity Solutions>
+<Drone Monitoring, connectedTo, Data Security in Agriculture>
+<Drone Monitoring, connectedTo, Geographic Information Systems for Farms>
+<Farm Labor Management Software, connectedTo, Automated Irrigation>
+<Farm Labor Management Software, connectedTo, Blockchain for Agri_Supply Chain>
+<Farm Labor Management Software, connectedTo, Pest and Disease Management Systems>
+<Farm Labor Management Software, connectedTo, Satellite Imaging>
+<Farm Labor Management Software, connectedTo, Vertical Farming Technology>
+<Farm Management Dashboards, connectedTo, Automated Irrigation>
+<Farm Management Dashboards, partOf, Farm Management Dashboards>
+<Farm Management Software, connectedTo, Data Security in Agriculture>
+<Farm Management Software, reports, Automated Irrigation>
+<Forestry Management with Digital Tools, connectedTo, Automated Irrigation>
+<Forestry Management with Digital Tools, partOf, Forestry Management with Digital Tools>
+<Geographic Information Systems for Farms, connectedTo, Data Security in Agriculture>
+<Geographic Information Systems for Farms, connectedTo, Farm Labor Management Software>
+<Herd Health Monitoring, connectedTo, Automated Irrigation>
+<Herd Health Monitoring, connectedTo, Drone Monitoring>
+<Livestock Feeding Automation, connectedTo, Predictive Analytics for Harvest>
+<Livestock Feeding Automation, partOf, Livestock Feeding Automation>
+<Market Price Forecasting, connectedTo, Livestock Feeding Automation>
+<Market Price Forecasting, partOf, Market Price Forecasting>
+<Pest and Disease Management Systems, connectedTo, Data Security in Agriculture>
+<Precision Farming, connectedTo, Smart Greenhouses>
+<Predictive Analytics for Harvest, connectedTo, Farm Management Dashboards>
+<Predictive Analytics for Harvest, partOf, Predictive Analytics for Harvest>
+<Satellite Imaging, connectedTo, Vertical Farming Technology>
+<Smart Greenhouses, connectedTo, Automated Farm Machinery>
+<Variable Rate Application, connectedTo, Data Security in Agriculture>
+<Variable Rate Application, connectedTo, Pest and Disease Management Systems>
+<Variable Rate Application, connectedTo, Vertical Farming Technology>
+<Variable Rate Application, decision_supports, Weather Station Data Integration>
+<Weather Station Data Integration, connectedTo, Data Security in Agriculture>
+<Weather Station Data Integration, connectedTo, Pest and Disease Management Systems>
+<Weather Station Data Integration, connectedTo, Vertical Farming Technology>
+<Yield Mapping, connectedTo, Forestry Management with Digital Tools>
+<Yield Mapping, partOf, Yield Mapping>
diff --git a/test/graphviz/scanned_medium/graphviz_356.dot b/test/graphviz/scanned_medium/graphviz_356.dot
new file mode 100644
index 0000000000000000000000000000000000000000..facd4dac7b2d347599dc8fef5135a3daba801397
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_356.dot
@@ -0,0 +1,81 @@
+digraph {
+	rankdir=RL
+	N0 [label="Game Strategy Development" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N1 [label="Prize Pool Management" color="#FFCC7A" fillcolor="#FFF6D9" shape=parallelogram style=filled]
+	N2 [label="Player Contracts" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+	N3 [label="Talent Representation" color="#FFC107" fillcolor="#FFECB3" shape=diamond style=filled]
+	N4 [label="Performance Analysis" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N5 [label="Nutrition for Esports Athletes" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N6 [label="Fan Community Building" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N7 [label="Anti_Cheat Measures" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N8 [label="League Management" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N9 [label="Ticketing Sales" color="#FFCC7A" fillcolor="#FFF6D9" shape=diamond style=filled]
+	N10 [label="Audience Engagement" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+	N11 [label="Esports Education Programs" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	N12 [label="Game Server Management" color="#FFF9AE" fillcolor="#FFFCE6" shape=box style=filled]
+	N13 [label="Esports Team Ownership" color="#FFF9AE" fillcolor="#FFFCE6" shape=ellipse style=filled]
+	S0 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#FFF9AE" fillcolor="#FFFCE6" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M1 [label="" color="#FFCC7A" fillcolor="#FFF6D9" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#FFC107" fillcolor="#FFECB3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#E3F2FD" fontname=Helvetica fontsize=10 label="Media Rights Negotiation" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Physical Conditioning for Players" color="#FFC107" fillcolor="#FFECB3" shape=folder style=filled]
+		nest0_1 [label="Legal Advisory for Esports" color="#FFCC7A" fillcolor="#FFF6D9" shape=oval style=filled]
+		nest0_0 -> nest0_1 [label=teams_forms color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#ECEFF1" fontname=Helvetica fontsize=10 label="Social Media Management" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Esports Analytics" color="#FFF9AE" fillcolor="#FFFCE6" shape=parallelogram style=filled]
+		nest1_1 [label="Live Streaming Production" color="#FFCC7A" fillcolor="#FFF6D9" shape=oval style=filled]
+		nest1_2 [label="Player Wellness Programs" color="#FFCC7A" fillcolor="#FFF6D9" shape=box style=filled]
+		nest1_3 [label="Venue Setup" color="#FFCC7A" fillcolor="#FFF6D9" shape=ellipse style=filled]
+		nest1_0 -> nest1_1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+		nest1_1 -> nest1_2 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+		nest1_2 -> nest1_3 [label=broadcasts color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	}
+	N0 -> N1 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N11 -> N12 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	N12 -> N13 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N1 -> nest0_0 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	nest0_1 -> N5 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N10 -> nest1_0 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	nest1_3 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> S0 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N12 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	S0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> S1 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N9 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N13 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S1 -> N6 [label=tournaments_hosts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S2 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	S2 -> N4 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	S2 -> N10 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	S2 -> N11 [color="#FFCC7A" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#FFF9AE" dir=forward penwidth=1.5 style=solid]
+	N3 -> M0 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	M0 -> N10 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	N3 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> M1 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+	M1 -> N6 [color="#FFCC7A" dir=forward penwidth=1.5 style=solid]
+	N1 -> M2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> M2 [color="#FFF9AE" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N3 [color="#FFC107" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_357.dot b/test/graphviz/scanned_medium/graphviz_357.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0e5dc3d07b963cacfcff8fea65b8988da955ab80
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_357.dot
@@ -0,0 +1,62 @@
+digraph {
+	rankdir=RL
+	N0 [label="Spike Train Analysis" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N1 [label="Artificial Neural Networks Modeling" color="#81C784" fillcolor="#F1F8E9" shape=parallelogram style=filled]
+	N2 [label="Cognitive Neuroscience" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N3 [label="Transcranial Magnetic Stimulation" color="#AB47BC" fillcolor="#F3E5F5" shape=hexagon style=filled]
+	N4 [label="Consciousness Studies" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N5 [label="Systems Neuroscience" color="#D3EB9F" fillcolor="#F8FDD3" shape=oval style=filled]
+	N6 [label=Neuroethics color="#AB47BC" fillcolor="#F3E5F5" shape=box style=filled]
+	N7 [label="Brain Mapping" color="#81C784" fillcolor="#F1F8E9" shape=box style=filled]
+	N8 [label="Cellular Neuroscience" color="#D3EB9F" fillcolor="#F8FDD3" shape=box style=filled]
+	N9 [label=Neuroprosthetics color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N10 [label="Neural Data Analysis" color="#81C784" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	S0 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	S1 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M0 [label="" color="#D3EB9F" fillcolor="#F8FDD3" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	M2 [label="" color="#AB47BC" fillcolor="#F3E5F5" fixedsize=true height=0.1 shape=box style=filled width=0.1]
+	subgraph_anchor_Group0 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group0 {
+		color=gray50 fillcolor="#F3E5F5" fontname=Helvetica fontsize=10 label="Molecular Neuroscience" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest0_0 [label="Addiction Neuroscience" color="#D3EB9F" fillcolor="#F8FDD3" shape=oval style=filled]
+		nest0_1 [label="Sensory Perception Research" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+		nest0_2 [label="Brain Imaging" color="#81C784" fillcolor="#F1F8E9" shape=octagon style=filled]
+		nest0_3 [label="Learning Mechanisms Study" color="#AB47BC" fillcolor="#F3E5F5" shape=folder style=filled]
+		nest0_0 -> nest0_1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+		nest0_1 -> nest0_2 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+		nest0_2 -> nest0_3 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	}
+	subgraph_anchor_Group1 [label="" height=0.01 shape=point style=invis width=0.01]
+	subgraph cluster_Group1 {
+		color=gray50 fillcolor="#FFF3E0" fontname=Helvetica fontsize=10 label="Neurotransmitter Research" labeljust=l labelloc=t pencolor=gray50 penwidth=1.5 style="rounded,filled,dashed"
+		nest1_0 [label="Genetic Basis of Brain Disorders" color="#D3EB9F" fillcolor="#F8FDD3" shape=diamond style=filled]
+		nest1_1 [label="Brain_Computer Interface" color="#81C784" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+		nest1_0 -> nest1_1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	}
+	N0 -> N1 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=maps color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#81C784" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#D3EB9F" dir=forward penwidth=1.5 style=solid]
+	N2 -> nest0_0 [label=visualizes_data color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	nest0_3 -> N1 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N4 -> nest1_0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	nest1_1 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N7 -> S0 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S0 -> N9 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	S0 -> N10 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> S1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	S1 -> N10 [color="#81C784" dir=forward penwidth=1.5 style=solid]
+	S1 -> N7 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M0 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> M0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	M0 -> N5 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N1 -> M2 [color="#AB47BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> M2 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	M2 -> N5 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_357.txt b/test/graphviz/scanned_medium/graphviz_357.txt
new file mode 100644
index 0000000000000000000000000000000000000000..776d1dbf7cac1d37f6fb4dec3591527f32eb0f2c
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_357.txt
@@ -0,0 +1,31 @@
+<Addiction Neuroscience, connectedTo, Sensory Perception Research>
+<Addiction Neuroscience, partOf, Addiction Neuroscience>
+<Artificial Neural Networks Modeling, connectedTo, Systems Neuroscience>
+<Artificial Neural Networks Modeling, maps, Cognitive Neuroscience>
+<Brain Imaging, connectedTo, Learning Mechanisms Study>
+<Brain Imaging, partOf, Brain Imaging>
+<Brain Mapping, connectedTo, Cellular Neuroscience>
+<Brain Mapping, connectedTo, Neural Data Analysis>
+<Brain Mapping, connectedTo, Neuroprosthetics>
+<Brain_Computer Interface, connectedTo, Systems Neuroscience>
+<Brain_Computer Interface, partOf, Brain_Computer Interface>
+<Cellular Neuroscience, connectedTo, Neuroprosthetics>
+<Cognitive Neuroscience, connectedTo, Brain Mapping>
+<Cognitive Neuroscience, connectedTo, Neural Data Analysis>
+<Cognitive Neuroscience, connectedTo, Systems Neuroscience>
+<Cognitive Neuroscience, connectedTo, Transcranial Magnetic Stimulation>
+<Cognitive Neuroscience, visualizes_data, Addiction Neuroscience>
+<Consciousness Studies, connectedTo, Genetic Basis of Brain Disorders>
+<Consciousness Studies, connectedTo, Systems Neuroscience>
+<Genetic Basis of Brain Disorders, connectedTo, Brain_Computer Interface>
+<Genetic Basis of Brain Disorders, partOf, Genetic Basis of Brain Disorders>
+<Learning Mechanisms Study, connectedTo, Artificial Neural Networks Modeling>
+<Learning Mechanisms Study, partOf, Learning Mechanisms Study>
+<Neuroethics, connectedTo, Brain Mapping>
+<Neuroprosthetics, connectedTo, Neural Data Analysis>
+<Sensory Perception Research, connectedTo, Brain Imaging>
+<Sensory Perception Research, partOf, Sensory Perception Research>
+<Spike Train Analysis, connectedTo, Artificial Neural Networks Modeling>
+<Systems Neuroscience, connectedTo, Neuroethics>
+<Transcranial Magnetic Stimulation, connectedTo, Consciousness Studies>
+<Transcranial Magnetic Stimulation, connectedTo, Systems Neuroscience>
diff --git a/test/graphviz/scanned_medium/graphviz_359.txt b/test/graphviz/scanned_medium/graphviz_359.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f732403c9fefa4d30bd9dccfaab54f0a1b4c5958
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_359.txt
@@ -0,0 +1,39 @@
+<Bio_logic Gates, connectedTo, Gene Therapy Delivery Systems>
+<Biocontainment Strategies, connectedTo, Regulatory Frameworks>
+<Biofuel Production, connectedTo, Protein Design>
+<Bioremediation Applications, connectedTo, Cellular Reprogramming>
+<Bioremediation Applications, connectedTo, Diagnostic Tool Development>
+<Biosecurity Protocols, connectedTo, Novel Enzyme Creation>
+<Cell_Free Systems, connectedTo, Microbial Factories>
+<Cell_Free Systems, partOf, Cell_Free Systems>
+<Cellular Reprogramming, connectedTo, Genetic Circuit Design>
+<Cellular Reprogramming, partOf, Cellular Reprogramming>
+<Computational Design of Biological Systems, connectedTo, Cell_Free Systems>
+<Computational Design of Biological Systems, partOf, Computational Design of Biological Systems>
+<Diagnostic Tool Development, connectedTo, Biocontainment Strategies>
+<Directed Evolution, connectedTo, Biofuel Production>
+<Directed Evolution, connectedTo, Diagnostic Tool Development>
+<Drug Delivery Systems, connectedTo, Biocontainment Strategies>
+<Drug Delivery Systems, connectedTo, Bioremediation Applications>
+<Drug Delivery Systems, connectedTo, Biosecurity Protocols>
+<Drug Delivery Systems, connectedTo, Modular Biology Design>
+<Drug Delivery Systems, organisms_creates, Directed Evolution>
+<Ethical Implications, connectedTo, Biocontainment Strategies>
+<Ethical Implications, connectedTo, Drug Delivery Systems>
+<Ethical Implications, therapies_innovates, Diagnostic Tool Development>
+<Gene Synthesis Platforms, connectedTo, Bio_logic Gates>
+<Gene Synthesis Platforms, connectedTo, Computational Design of Biological Systems>
+<Gene Therapy Delivery Systems, connectedTo, Biocontainment Strategies>
+<Gene Therapy Delivery Systems, connectedTo, Ethical Implications>
+<Genetic Circuit Design, connectedTo, Regulatory Frameworks>
+<Genetic Circuit Design, partOf, Genetic Circuit Design>
+<High_Throughput Screening, connectedTo, Diagnostic Tool Development>
+<High_Throughput Screening, connectedTo, Gene Synthesis Platforms>
+<Microbial Factories, connectedTo, Regulatory Frameworks>
+<Microbial Factories, partOf, Microbial Factories>
+<Modular Biology Design, connectedTo, Biosecurity Protocols>
+<Novel Enzyme Creation, connectedTo, DNA Storage Technologies>
+<Protein Design, connectedTo, Bioremediation Applications>
+<Regulatory Frameworks, connectedTo, Biosecurity Protocols>
+<Regulatory Frameworks, connectedTo, Modular Biology Design>
+<Regulatory Frameworks, connectedTo, Novel Enzyme Creation>
diff --git a/test/graphviz/scanned_medium/graphviz_36.txt b/test/graphviz/scanned_medium/graphviz_36.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2418c125260e9e5ad37b526fbc5ee0aa54902e22
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_36.txt
@@ -0,0 +1,12 @@
+<Blockchain for Traceability, connectedTo, Intermodal Transportation>
+<Distribution Network Design, procures, Customs Compliance>
+<Hazardous Materials Handling, connectedTo, Warehousing>
+<Intermodal Transportation, analyzes, Supply Chain Visibility>
+<Predictive Analytics, connectedTo, Procurement>
+<Procurement, automates, Hazardous Materials Handling>
+<Resilience Planning, distributes, Predictive Analytics>
+<Supply Chain Visibility, risk, Distribution Network Design>
+<Third_Party Logistics Management, connectedTo, Blockchain for Traceability>
+<Third_Party Logistics Management, connectedTo, Distribution Network Design>
+<Vendor Managed Inventory, sources, Third_Party Logistics Management>
+<Warehousing, connectedTo, Vendor Managed Inventory>
diff --git a/test/graphviz/scanned_medium/graphviz_360.txt b/test/graphviz/scanned_medium/graphviz_360.txt
new file mode 100644
index 0000000000000000000000000000000000000000..abc12b13c55642813bd608039d526026693e5b4e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_360.txt
@@ -0,0 +1,33 @@
+<Accessibility in EdTech, connectedTo, Curriculum Digitization>
+<Accessibility in EdTech, connectedTo, Virtual Reality in Education>
+<Accessibility in EdTech, partOf, Accessibility in EdTech>
+<Adaptive Learning Systems, connectedTo, Competency_Based Learning Platforms>
+<Adaptive Learning Systems, connectedTo, Student Performance Tracking>
+<Competency_Based Learning Platforms, connectedTo, Professional Development for Educators>
+<Curriculum Digitization, connectedTo, Adaptive Learning Systems>
+<Curriculum Digitization, connectedTo, Professional Development for Educators>
+<Curriculum Digitization, connectedTo, Virtual Classrooms>
+<Curriculum Digitization, connectedTo, Virtual Reality in Education>
+<Curriculum Digitization, partOf, Curriculum Digitization>
+<EdTech Hardware Solutions, connectedTo, Adaptive Learning Systems>
+<Educational Robotics, connectedTo, Virtual Classrooms>
+<Massive Open Online Courses, partOf, Massive Open Online Courses>
+<Massive Open Online Courses, teachers_trains, Educational Robotics>
+<Online Tutoring Platforms, connectedTo, Massive Open Online Courses>
+<Online Tutoring Platforms, partOf, Online Tutoring Platforms>
+<Personalized Learning Paths, connectedTo, Educational Robotics>
+<Professional Development for Educators, connectedTo, EdTech Hardware Solutions>
+<Student Information Systems, connectedTo, Online Tutoring Platforms>
+<Student Information Systems, partOf, Student Information Systems>
+<Student Performance Tracking, connectedTo, Adaptive Learning Systems>
+<Student Performance Tracking, connectedTo, Virtual Reality in Education>
+<Student Performance Tracking, partOf, Student Performance Tracking>
+<Virtual Classrooms, connectedTo, Adaptive Learning Systems>
+<Virtual Classrooms, connectedTo, Competency_Based Learning Platforms>
+<Virtual Classrooms, connectedTo, Professional Development for Educators>
+<Virtual Classrooms, connectedTo, Virtual Labs>
+<Virtual Labs, connectedTo, Educational Robotics>
+<Virtual Labs, connectedTo, Student Information Systems>
+<Virtual Labs, partOf, Virtual Labs>
+<Virtual Reality in Education, connectedTo, Accessibility in EdTech>
+<Virtual Reality in Education, partOf, Virtual Reality in Education>
diff --git a/test/graphviz/scanned_medium/graphviz_37.txt b/test/graphviz/scanned_medium/graphviz_37.txt
new file mode 100644
index 0000000000000000000000000000000000000000..51f6ba4aaa14149febd60a3e11488a26f207e27f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_37.txt
@@ -0,0 +1,10 @@
+<Core Logging, licenses, Exploration Drilling>
+<Drilling and Blasting, forecasts, Geotechnical Stability Analysis>
+<Environmental Impact Assessment, automates, Exploration>
+<Exploration, models, Core Logging>
+<Feasibility Study, manages, Drilling and Blasting>
+<Geotechnical Stability Analysis, connectedTo, Resource Estimation>
+<Permit Acquisition, extracts, Regulatory Compliance Reporting>
+<Regulatory Compliance Reporting, audits, Environmental Impact Assessment>
+<Regulatory Compliance Reporting, connectedTo, Geotechnical Stability Analysis>
+<Resource Estimation, connectedTo, Permit Acquisition>
diff --git a/test/graphviz/scanned_medium/graphviz_38.txt b/test/graphviz/scanned_medium/graphviz_38.txt
new file mode 100644
index 0000000000000000000000000000000000000000..43e0263d6ecabdece76f6de45bf27f18230cb35a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_38.txt
@@ -0,0 +1,12 @@
+<Bunkering, connectedTo, Inland Waterway Transport>
+<Cargo Loading, connectedTo, Marine Research>
+<Cargo Loading, connectedTo, Voyage Optimization>
+<Fuel Consumption Optimization, salvages, Marine Research>
+<Inland Waterway Transport, protects, Vessel Chartering>
+<Marine Insurance, connectedTo, Pilotage>
+<Marine Research, monitors, Port Operations>
+<Pilotage, unloads, Ship Design>
+<Port Congestion Management, connectedTo, Bunkering>
+<Port Operations, plans, Port Congestion Management>
+<Vessel Chartering, connectedTo, Cargo Loading>
+<Voyage Optimization, connectedTo, Marine Insurance>
diff --git a/test/graphviz/scanned_medium/graphviz_4.dot b/test/graphviz/scanned_medium/graphviz_4.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ab300c927e3cc5e71e97828bc5100e7bfa07be8f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_4.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=BT
+	N0 [label="Attendance Tracking" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N1 [label="Digital Resource Management" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N2 [label="Exam Conduct" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N3 [label="Peer Tutoring" color="#AED581" fillcolor="#F0F4C3" shape=diamond style=filled]
+	N4 [label="Advisory Committee Meeting" color="#AED581" fillcolor="#F0F4C3" shape=box style=filled]
+	N5 [label="Document Verification" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Assignment Submission" color="#3F51B5" fillcolor="#C5CAE9" shape=ellipse style=filled]
+	N7 [label="Disciplinary Action" color="#3F51B5" fillcolor="#C5CAE9" shape=plaintext style=filled]
+	N8 [label="Extracurricular Activity" color="#3F51B5" fillcolor="#C5CAE9" shape=folder style=filled]
+	N9 [label="Timetable Scheduling" color="#AED581" fillcolor="#F0F4C3" shape=ellipse style=filled]
+	N0 -> N1 [label=updates color="#AED581" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=trains color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=licenses color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#3F51B5" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#AED581" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=administers color="#5C6BC0" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N4 [color="#3F51B5" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_4.txt b/test/graphviz/scanned_medium/graphviz_4.txt
new file mode 100644
index 0000000000000000000000000000000000000000..31e6fbddb71ab6775637e88ddf4f24a010aed1a1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_4.txt
@@ -0,0 +1,10 @@
+<Advisory Committee Meeting, connectedTo, Document Verification>
+<Assignment Submission, administers, Disciplinary Action>
+<Attendance Tracking, updates, Digital Resource Management>
+<Digital Resource Management, connectedTo, Exam Conduct>
+<Disciplinary Action, connectedTo, Extracurricular Activity>
+<Document Verification, connectedTo, Assignment Submission>
+<Exam Conduct, trains, Peer Tutoring>
+<Extracurricular Activity, connectedTo, Advisory Committee Meeting>
+<Extracurricular Activity, connectedTo, Timetable Scheduling>
+<Peer Tutoring, licenses, Advisory Committee Meeting>
diff --git a/test/graphviz/scanned_medium/graphviz_40.dot b/test/graphviz/scanned_medium/graphviz_40.dot
new file mode 100644
index 0000000000000000000000000000000000000000..060af0e33c6db096b46786d6bd537be6f369f899
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_40.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=RL
+	N0 [label="Water Resource Management under Climate Change" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N1 [label="Solar Radiation Management Research" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N2 [label="Indigenous Knowledge Integration" color="#FFD54F" fillcolor="#FFF8E1" shape=plaintext style=filled]
+	N3 [label="International Climate Negotiation" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N4 [label="Adaptation Strategy Development" color="#B8C0F5" fillcolor="#ECF0FD" shape=octagon style=filled]
+	N5 [label="Cloud Formation Research" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N6 [label="Climate Change Vulnerability Assessment" color="#C0CA33" fillcolor="#F9FBE7" shape=hexagon style=filled]
+	N7 [label="Biodiversity Impact Assessment" color="#B8C0F5" fillcolor="#ECF0FD" shape=ellipse style=filled]
+	N8 [label="Ice Sheet Dynamics" color="#B8C0F5" fillcolor="#ECF0FD" shape=box style=filled]
+	N9 [label="Permafrost Thaw Assessment" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N0 -> N1 [label=communicates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FFD54F" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=projects color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=predicts color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=mitigates color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=impacts color="#FFD54F" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N4 [label=informs color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_42.txt b/test/graphviz/scanned_medium/graphviz_42.txt
new file mode 100644
index 0000000000000000000000000000000000000000..42d6fc70880dde70c8608e75c5197bf57abc1c45
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_42.txt
@@ -0,0 +1,12 @@
+<Extended Producer Responsibility, educates, Resource Recovery>
+<Glass Recycling, treats, Landfill Operation>
+<Illegal Dumping Monitoring, disposes, Smart Waste Bins>
+<Landfill Operation, incinerates, Public Education on Waste>
+<Leachate Treatment, connectedTo, Illegal Dumping Monitoring>
+<Public Education on Waste, connectedTo, Transfer Station Management>
+<Public Education on Waste, processes, Zero Waste Initiatives>
+<Resource Recovery, connectedTo, Waste Compaction>
+<Resource Recovery, licenses, Transfer Station Management>
+<Smart Waste Bins, connectedTo, Extended Producer Responsibility>
+<Waste Compaction, connectedTo, Zero Waste Initiatives>
+<Zero Waste Initiatives, connectedTo, Glass Recycling>
diff --git a/test/graphviz/scanned_medium/graphviz_43.txt b/test/graphviz/scanned_medium/graphviz_43.txt
new file mode 100644
index 0000000000000000000000000000000000000000..af24e10681d4be9e858873f33aff1f4434e8af8d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_43.txt
@@ -0,0 +1,10 @@
+<Agricultural Water Use Efficiency, consults, Flood Control>
+<Aquifer Recharge, distributes, Transboundary Water Management>
+<Billing and Revenue Management, connectedTo, Aquifer Recharge>
+<Flood Control, collects, Billing and Revenue Management>
+<Irrigation Management, connectedTo, Agricultural Water Use Efficiency>
+<Transboundary Water Management, evaluates, Flood Control>
+<Water Quality Monitoring, designs, Water Resource Planning>
+<Water Resource Planning, protects, Water Treatment>
+<Water Treatment, connectedTo, Billing and Revenue Management>
+<Water Treatment, connectedTo, Irrigation Management>
diff --git a/test/graphviz/scanned_medium/graphviz_44.dot b/test/graphviz/scanned_medium/graphviz_44.dot
new file mode 100644
index 0000000000000000000000000000000000000000..f81bcf919eb610e0b1f7da070444f0bbd3b54793
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_44.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=BT
+	N0 [label="Recycling Infrastructure Development" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N1 [label="Metal Recycling" color="#FFC085" fillcolor="#FFDAB9" shape=Mdiamond style=filled]
+	N2 [label="Recycling Market Development" color="#9C27B0" fillcolor="#E1BEE7" shape=octagon style=filled]
+	N3 [label="Chemical Recycling" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N4 [label="Product Design for Recyclability" color="#9C27B0" fillcolor="#E1BEE7" shape=ellipse style=filled]
+	N5 [label="Commercial Recycling Solutions" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N6 [label="Reprocessing into Raw Material" color="#9C27B0" fillcolor="#E1BEE7" shape=oval style=filled]
+	N7 [label="Advanced Sorting Technologies" color="#9C27B0" fillcolor="#E1BEE7" shape=box style=filled]
+	N8 [label="Sorting and Segregation" color="#9C27B0" fillcolor="#E1BEE7" shape=octagon style=filled]
+	N9 [label="New Product Manufacturing" color="#6EB76D" fillcolor="#E9F7E8" shape=ellipse style=filled]
+	N0 -> N1 [label=partners color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#6EB76D" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=subsidizes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=reuses color="#6EB76D" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=forms color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#FFC085" dir=forward penwidth=1.5 style=solid]
+	N8 -> N2 [label=innovates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N7 [label=collects color="#9C27B0" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_45.dot b/test/graphviz/scanned_medium/graphviz_45.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d87cdae37f7b72f6e3b6631b877b96b89a647602
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_45.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=BT
+	N0 [label="Erosion Control" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N1 [label="Sustainable Forest Management" color="#5C6BC0" fillcolor="#E8EAF6" shape=ellipse style=filled]
+	N2 [label="Drone Surveying for Forests" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N3 [label="Agroforestry Systems" color="#5C6BC0" fillcolor="#E8EAF6" shape=hexagon style=filled]
+	N4 [label="Forestry Education" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N5 [label="GIS Mapping for Forestry" color="#5C6BC0" fillcolor="#E8EAF6" shape=box style=filled]
+	N6 [label="Forest Health Monitoring" color="#5C6BC0" fillcolor="#E8EAF6" shape=parallelogram style=filled]
+	N7 [label="Climate Change Adaptation in Forests" color="#AB47BC" fillcolor="#F3E5F5" shape=ellipse style=filled]
+	N0 -> N1 [label=measures color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=maps color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#5C6BC0" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=predicts color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=manages color="#9575CD" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N4 [label=analyzes color="#AB47BC" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_45.txt b/test/graphviz/scanned_medium/graphviz_45.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9a7346d1184c89f2bbeb8548eb98b3b257c7bbb2
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_45.txt
@@ -0,0 +1,8 @@
+<Agroforestry Systems, connectedTo, Forestry Education>
+<Drone Surveying for Forests, maps, Agroforestry Systems>
+<Erosion Control, measures, Sustainable Forest Management>
+<Forest Health Monitoring, manages, Climate Change Adaptation in Forests>
+<Forestry Education, predicts, GIS Mapping for Forestry>
+<GIS Mapping for Forestry, analyzes, Forestry Education>
+<GIS Mapping for Forestry, connectedTo, Forest Health Monitoring>
+<Sustainable Forest Management, connectedTo, Drone Surveying for Forests>
diff --git a/test/graphviz/scanned_medium/graphviz_46.txt b/test/graphviz/scanned_medium/graphviz_46.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fa817df6a208547b620df9b50770299213cc5d0f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_46.txt
@@ -0,0 +1,10 @@
+<Anesthesia Administration, inspects, Toxicology Testing>
+<Animal Sheltering Consultation, dispenses, Euthanasia Services>
+<Client Communication, orders, Dental Care>
+<Dental Care, connectedTo, Imaging Services>
+<Euthanasia Services, connectedTo, Client Communication>
+<Herd Health Programs, connectedTo, Anesthesia Administration>
+<Herd Health Programs, examines, Pet Check_up>
+<Pet Check_up, certifies, Herd Health Programs>
+<Public Health Vet Services, connectedTo, Animal Sheltering Consultation>
+<Toxicology Testing, bills, Public Health Vet Services>
diff --git a/test/graphviz/scanned_medium/graphviz_47.dot b/test/graphviz/scanned_medium/graphviz_47.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2d683856657c993f6ce4b896857dcd2931185df7
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_47.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=BT
+	N0 [label="Behavior Management" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N1 [label="Creative Arts Activities" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N2 [label="Teacher_Child Ratio Management" color="#42A5F5" fillcolor="#F1F8FF" shape=octagon style=filled]
+	N3 [label="Field Trip Organization" color="#FFC085" fillcolor="#FFDAB9" shape=folder style=filled]
+	N4 [label="Playground Safety Inspection" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N5 [label="Early Literacy Programs" color="#A188DB" fillcolor="#DED7F0" shape=oval style=filled]
+	N6 [label="Child Psychology Application" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N7 [label="Staff Training and Certification" color="#A188DB" fillcolor="#DED7F0" shape=box style=filled]
+	N8 [label="Curriculum Planning" color="#FFC085" fillcolor="#FFDAB9" shape=box style=filled]
+	N9 [label="Childcare Facility Licensing" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N0 -> N1 [label=prepares color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=enrolls color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=feeds color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=administers color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=manages color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#42A5F5" dir=forward penwidth=1.5 style=solid]
+	N1 -> N4 [color="#FFC085" dir=forward penwidth=1.5 style=dashed]
+	N0 -> N8 [label=licenses color="#FFC085" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_48.dot b/test/graphviz/scanned_medium/graphviz_48.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a0c26259540908a70564be8af40dd4c1f57faf2b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_48.dot
@@ -0,0 +1,28 @@
+digraph {
+	rankdir=TD
+	N0 [label="Cognitive Stimulation Activities" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N1 [label="Rehabilitation Support" color="#388E3C" fillcolor="#F1F8E9" shape=Mdiamond style=filled]
+	N2 [label="Emotional Support and Counseling" color="#FF8A65" fillcolor="#FBE9E7" shape=hexagon style=filled]
+	N3 [label="Family Communication" color="#388E3C" fillcolor="#F1F8E9" shape=octagon style=filled]
+	N4 [label="Personal Care Assistance" color="#FF8A65" fillcolor="#FBE9E7" shape=octagon style=filled]
+	N5 [label="Hospice Care Coordination" color="#795548" fillcolor="#D7CCC8" shape=ellipse style=filled]
+	N6 [label="Nursing Care" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N7 [label="Safety Assessments" color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N8 [label="Health Monitoring" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N9 [label="Home Health Aide Services" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N10 [label="Social Engagement Activities" color="#795548" fillcolor="#D7CCC8" shape=Mdiamond style=filled]
+	N11 [label="Palliative Care" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N0 -> N1 [label=accompanies color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=supervises color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=assists color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=bathes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=prevents color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N11 [label=secures color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N0 -> N2 [label=rehabilitates color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N4 -> N0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_48.txt b/test/graphviz/scanned_medium/graphviz_48.txt
new file mode 100644
index 0000000000000000000000000000000000000000..23ec7dc081646d763a5fbf8f12d81b9a18242009
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_48.txt
@@ -0,0 +1,13 @@
+<Cognitive Stimulation Activities, accompanies, Rehabilitation Support>
+<Cognitive Stimulation Activities, rehabilitates, Emotional Support and Counseling>
+<Emotional Support and Counseling, connectedTo, Family Communication>
+<Family Communication, assists, Personal Care Assistance>
+<Health Monitoring, prevents, Home Health Aide Services>
+<Home Health Aide Services, connectedTo, Social Engagement Activities>
+<Hospice Care Coordination, connectedTo, Nursing Care>
+<Nursing Care, connectedTo, Safety Assessments>
+<Personal Care Assistance, connectedTo, Cognitive Stimulation Activities>
+<Personal Care Assistance, connectedTo, Hospice Care Coordination>
+<Rehabilitation Support, supervises, Emotional Support and Counseling>
+<Safety Assessments, bathes, Health Monitoring>
+<Social Engagement Activities, secures, Palliative Care>
diff --git a/test/graphviz/scanned_medium/graphviz_49.dot b/test/graphviz/scanned_medium/graphviz_49.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ff4abefb477f9bc6c333bdea3ef1f4aeb6992d3c
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_49.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=TD
+	N0 [label="Resilience Building" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Environmental Remediation" color="#FFCC80" fillcolor="#FFF0CC" shape=Mdiamond style=filled]
+	N2 [label="Risk Assessment" color="#2196F3" fillcolor="#BBDEFB" shape=folder style=filled]
+	N3 [label="Capacity Building for Local Communities" color="#8C9EFF" fillcolor="#D3D7EB" shape=oval style=filled]
+	N4 [label="Damage Assessment" color="#8C9EFF" fillcolor="#D3D7EB" shape=folder style=filled]
+	N5 [label="Shelter Management" color="#FFCC80" fillcolor="#FFF0CC" shape=diamond style=filled]
+	N6 [label="Search and Rescue Operations" color="#FFCC80" fillcolor="#FFF0CC" shape=box style=filled]
+	N7 [label="Evacuation Procedures" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N8 [label="Psychosocial Support" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N9 [label="Resource Mobilization" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N0 -> N1 [label=provides color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=rescues color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFCC80" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=rebuilds color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=distributes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=responds color="#2196F3" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N6 [label=analyzes color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_52.dot b/test/graphviz/scanned_medium/graphviz_52.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c4e72e695144a2a8465feeed2afaff5b13089739
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_52.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=BT
+	N0 [label="Lane Guidance" color="#92C79A" fillcolor="#E8F0EA" shape=ellipse style=filled]
+	N1 [label="Cycle Route Planning" color="#92C79A" fillcolor="#E8F0EA" shape=box style=filled]
+	N2 [label=Geocoding color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N3 [label="Satellite Navigation Systems" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N4 [label="Altitude Tracking" color="#2196F3" fillcolor="#BBDEFB" shape=hexagon style=filled]
+	N5 [label="Reverse Geocoding" color="#92C79A" fillcolor="#E8F0EA" shape=oval style=filled]
+	N6 [label="Offline Map Support" color="#FFC107" fillcolor="#FFECB3" shape=Mdiamond style=filled]
+	N7 [label="Turn_by_Turn Directions" color="#FFC107" fillcolor="#FFECB3" shape=box style=filled]
+	N8 [label="Navigation Data Update" color="#FFC107" fillcolor="#FFECB3" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=corrects color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#92C79A" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FFC107" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=verifies color="#2196F3" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=tracks color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=validates color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N0 [color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_53.dot b/test/graphviz/scanned_medium/graphviz_53.dot
new file mode 100644
index 0000000000000000000000000000000000000000..be4ebe325793319e829f216101f5339f58f4d35e
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_53.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=BT
+	N0 [label="Consumer Product Creation" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N1 [label="Printing Process" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N2 [label="4D Printing" color="#FFF176" fillcolor="#FFFDE7" shape=diamond style=filled]
+	N3 [label=Post_Processing color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N4 [label="Printer Setup" color="#CD8FF2" fillcolor="#ECCFF5" shape=parallelogram style=filled]
+	N5 [label="Custom Part Production" color="#CDDC39" fillcolor="#E6EE9C" shape=hexagon style=filled]
+	N6 [label="Food Printing" color="#CD8FF2" fillcolor="#ECCFF5" shape=Mdiamond style=filled]
+	N7 [label="Construction 3D Printing" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N8 [label="Slicing Software Operation" color="#CDDC39" fillcolor="#E6EE9C" shape=box style=filled]
+	N9 [label="Print Farm Management" color="#CD8FF2" fillcolor="#ECCFF5" shape=box style=filled]
+	N10 [label="Direct Metal Laser Sintering" color="#CD8FF2" fillcolor="#ECCFF5" shape=ellipse style=filled]
+	N0 -> N1 [label=educates color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFF176" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=enhances color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=duplicates color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=certifies color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=maintains color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=prototypes color="#CDDC39" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=produces color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N4 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N5 [label=scans color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_54.txt b/test/graphviz/scanned_medium/graphviz_54.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7ee188fce0d97c9c5923d0bcf16657744e118168
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_54.txt
@@ -0,0 +1,11 @@
+<Bio_Nanotechnology Interface, communicates, Risk Assessment of Nanomaterials>
+<Catalysis at Nanoscale, purifies, Solar Cell Efficiency Enhancement>
+<Lab_on_a_Chip Devices, connectedTo, X_ray Diffraction>
+<Nanoelectronics, cleans, Nanofabrication Techniques>
+<Nanofabrication Techniques, analyzes, Nanomaterial Synthesis>
+<Nanomaterial Synthesis, connectedTo, Lab_on_a_Chip Devices>
+<Quantum Computing Integration, connectedTo, Catalysis at Nanoscale>
+<Risk Assessment of Nanomaterials, tests, Quantum Computing Integration>
+<Solar Cell Efficiency Enhancement, enhances, Water Purification using Nanomaterials>
+<Water Purification using Nanomaterials, connectedTo, Nanomaterial Synthesis>
+<X_ray Diffraction, detects, Bio_Nanotechnology Interface>
diff --git a/test/graphviz/scanned_medium/graphviz_58.txt b/test/graphviz/scanned_medium/graphviz_58.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8e959ab99117091414f3effb442c6d2595870784
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_58.txt
@@ -0,0 +1,11 @@
+<Arrangement, connectedTo, Performance>
+<Audio Engineering, connectedTo, Mixing>
+<Fan Engagement Strategy, connectedTo, Music Production>
+<Live Sound Engineering, connectedTo, Tour Management>
+<Live Sound Engineering, sings, Sound Design for Media>
+<Mixing, records, Sound System Design>
+<Music Production, connectedTo, Audio Engineering>
+<Performance, programs, Fan Engagement Strategy>
+<Sound Design for Media, produces, Sound System Design>
+<Sound System Design, audits, Tour Management>
+<Tour Management, analyzes, Live Sound Engineering>
diff --git a/test/graphviz/scanned_medium/graphviz_59.dot b/test/graphviz/scanned_medium/graphviz_59.dot
new file mode 100644
index 0000000000000000000000000000000000000000..fc90e0b59275a1b334044a2579b3e4f41c42db17
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_59.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=RL
+	N0 [label="Distribution Strategy" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N1 [label="Archiving and Preservation" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N2 [label="Film Festival Submission" color="#FFDA4E" fillcolor="#FFE88D" shape=folder style=filled]
+	N3 [label="Legal Compliance" color="#FFDA4E" fillcolor="#FFE88D" shape=parallelogram style=filled]
+	N4 [label="Script Development" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N5 [label="Production Accounting" color="#61CAC3" fillcolor="#C2E8E6" shape=ellipse style=filled]
+	N6 [label="Sound Recording" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N7 [label="Lighting Design" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N8 [label="Film Financing" color="#DCE775" fillcolor="#F9FBE7" shape=Mdiamond style=filled]
+	N9 [label="Tax Incentive Management" color="#DCE775" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N0 -> N1 [label=composes color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=manages color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=animates color="#FFDA4E" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=licenses color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=distributes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=records color="#DCE775" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N9 -> N4 [label=lights color="#61CAC3" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_6.dot b/test/graphviz/scanned_medium/graphviz_6.dot
new file mode 100644
index 0000000000000000000000000000000000000000..7db85b83ff422c3c1e7d50644406f9359287c858
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_6.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=LR
+	N0 [label="Ticket Purchase" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N1 [label="Bus Stop Management" color="#7E57C2" fillcolor="#D1C4E9" shape=box style=filled]
+	N2 [label="Incident Report" color="#42A5F5" fillcolor="#F1F8FF" shape=box style=filled]
+	N3 [label="Traffic Monitoring" color="#7E57C2" fillcolor="#D1C4E9" shape=diamond style=filled]
+	N4 [label="Bridge Inspection" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N5 [label="Cargo Loading" color="#42A5F5" fillcolor="#F1F8FF" shape=diamond style=filled]
+	N6 [label="Route Optimization" color="#42A5F5" fillcolor="#F1F8FF" shape=hexagon style=filled]
+	N7 [label="Platform Assignment" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=arrives color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=maintains color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=loads color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#388E3C" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=updates color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N5 -> N0 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_60.dot b/test/graphviz/scanned_medium/graphviz_60.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1a35dbd2ce55ba6355256ac5d35150d7b6e12a4f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_60.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=TD
+	N0 [label="Distribution Planning" color="#A1D7CD" fillcolor="#EDF5F3" shape=ellipse style=filled]
+	N1 [label="Research and Outline" color="#73C6BC" fillcolor="#D0EFEE" shape=oval style=filled]
+	N2 [label="Search Engine Optimization" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N3 [label=Branding color="#82DAFF" fillcolor="#C8EDFF" shape=box style=filled]
+	N4 [label="Content Repurposing" color="#A1D7CD" fillcolor="#EDF5F3" shape=oval style=filled]
+	N5 [label="E_book Writing" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N6 [label="Podcast Production" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N7 [label="Transcribing Audio or Video" color="#73C6BC" fillcolor="#D0EFEE" shape=plaintext style=filled]
+	N8 [label="Audience Analysis" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N9 [label=Videography color="#A1D7CD" fillcolor="#EDF5F3" shape=box style=filled]
+	N10 [label="Social Media Post Creation" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N0 -> N1 [label=distributes color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#73C6BC" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=illustrates color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=ideates color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=photographs color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=researches color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=publishes color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+	N7 -> N1 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N5 [label=audios color="#A1D7CD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_60.txt b/test/graphviz/scanned_medium/graphviz_60.txt
new file mode 100644
index 0000000000000000000000000000000000000000..27a02568514104ade657d43f2f87f9e2517042ab
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_60.txt
@@ -0,0 +1,12 @@
+<Audience Analysis, connectedTo, Videography>
+<Branding, ideates, Content Repurposing>
+<Content Repurposing, connectedTo, E_book Writing>
+<Distribution Planning, distributes, Research and Outline>
+<E_book Writing, connectedTo, Podcast Production>
+<Podcast Production, photographs, Transcribing Audio or Video>
+<Research and Outline, connectedTo, Search Engine Optimization>
+<Search Engine Optimization, illustrates, Branding>
+<Transcribing Audio or Video, connectedTo, Research and Outline>
+<Transcribing Audio or Video, researches, Audience Analysis>
+<Videography, audios, E_book Writing>
+<Videography, publishes, Social Media Post Creation>
diff --git a/test/graphviz/scanned_medium/graphviz_61.dot b/test/graphviz/scanned_medium/graphviz_61.dot
new file mode 100644
index 0000000000000000000000000000000000000000..5786e8a73fc79181204129fa09f2b7afe2a4ead7
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_61.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=LR
+	N0 [label="A or B Testing Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N1 [label="Data Storytelling" color="#F44336" fillcolor="#FFCDD2" shape=oval style=filled]
+	N2 [label="Data Governance" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N3 [label="Data Warehouse Design" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N4 [label="Dashboard Creation" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N5 [label="Data Transformation" color="#64B5F6" fillcolor="#E3F2FD" shape=diamond style=filled]
+	N6 [label="Social Media Analytics" color="#64B5F6" fillcolor="#E3F2FD" shape=box style=filled]
+	N7 [label="Sales Performance Analysis" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N8 [label="Exploratory Data Analysis" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N9 [label="Marketing Campaign Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N10 [label="Data Collection" color="#FF9800" fillcolor="#FFE0B2" shape=oval style=filled]
+	N11 [label="Geospatial Analysis" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N0 -> N1 [label=develops color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=audits color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=transforms color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=shares color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label=processes color="#000000" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [label=prepares color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N11 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_61.txt b/test/graphviz/scanned_medium/graphviz_61.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9c5f1927da2ea0c6ca5a44cc0430b2efe5436f4b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_61.txt
@@ -0,0 +1,12 @@
+<A or B Testing Analysis, develops, Data Storytelling>
+<Dashboard Creation, connectedTo, Data Transformation>
+<Data Collection, prepares, Geospatial Analysis>
+<Data Governance, connectedTo, Data Warehouse Design>
+<Data Storytelling, connectedTo, Data Governance>
+<Data Transformation, audits, Social Media Analytics>
+<Data Warehouse Design, connectedTo, Dashboard Creation>
+<Exploratory Data Analysis, shares, Marketing Campaign Analysis>
+<Marketing Campaign Analysis, connectedTo, Geospatial Analysis>
+<Marketing Campaign Analysis, processes, Data Collection>
+<Sales Performance Analysis, connectedTo, Exploratory Data Analysis>
+<Social Media Analytics, transforms, Sales Performance Analysis>
diff --git a/test/graphviz/scanned_medium/graphviz_62.dot b/test/graphviz/scanned_medium/graphviz_62.dot
new file mode 100644
index 0000000000000000000000000000000000000000..a064ba9fda32b226692c0ce7b4bf05971e15165b
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_62.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=BT
+	N0 [label="HR Analytics Dashboards" color="#FF5722" fillcolor="#FFCCBC" shape=ellipse style=filled]
+	N1 [label="Data Quality Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N2 [label="Data Modeling" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N3 [label="Supply Chain Optimization" color="#FF5722" fillcolor="#FFCCBC" shape=box style=filled]
+	N4 [label="Self_Service BI Tools" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N5 [label="Dashboard Design" color="#CB9BE1" fillcolor="#F2E6F5" shape=hexagon style=filled]
+	N6 [label="Sales Forecasting" color="#FF5722" fillcolor="#FFCCBC" shape=Mdiamond style=filled]
+	N7 [label="Master Data Management" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N8 [label="Financial Performance Reporting" color="#AF56A6" fillcolor="#DDCEDD" shape=box style=filled]
+	N9 [label="Data Source Integration" color="#FF5722" fillcolor="#FFCCBC" shape=folder style=filled]
+	N10 [label="Cloud BI Solutions" color="#AF56A6" fillcolor="#DDCEDD" shape=ellipse style=filled]
+	N0 -> N1 [label=dashboards color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=loads color="#FF5722" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=self_serves color="#AF56A6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=controls color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=OLAPs color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=visualizes color="#AF56A6" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N7 -> N0 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_63.txt b/test/graphviz/scanned_medium/graphviz_63.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6c7f4dd0cff6b7c6ebd9b0b34da55114cfbe4640
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_63.txt
@@ -0,0 +1,10 @@
+<A or B Testing for Marketing, connectedTo, Distribution Channel Management>
+<A or B Testing for Marketing, manages reputation, Affiliate Marketing>
+<Affiliate Marketing, enhances experiences, Direct Mail Marketing>
+<Content Marketing, connectedTo, Search Engine Marketing>
+<Customer Journey Mapping, manages social media, Mobile Marketing>
+<Distribution Channel Management, connectedTo, A or B Testing for Marketing>
+<Mobile Marketing, connectedTo, Distribution Channel Management>
+<Search Engine Marketing, promotes sales, Customer Journey Mapping>
+<Website Design and Optimization, creates content, Content Marketing>
+<Website Design and Optimization, generates leads, Customer Journey Mapping>
diff --git a/test/graphviz/scanned_medium/graphviz_64.txt b/test/graphviz/scanned_medium/graphviz_64.txt
new file mode 100644
index 0000000000000000000000000000000000000000..870783e840a72720030257f694664bdb6abed0cb
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_64.txt
@@ -0,0 +1,11 @@
+<Ad Analytics Reporting, connectedTo, Retargeting Campaigns>
+<Audience Segmentation for Ads, print advertising, Customer Acquisition Cost Analysis>
+<Campaign Planning, interprets analytics, Geo_Targeting>
+<Competitor Ad Analysis, connectedTo, Campaign Planning>
+<Customer Acquisition Cost Analysis, connectedTo, Return on Ad Spend Calculation>
+<Geo_Targeting, A or B tests creatives, Search Engine Ads>
+<Outdoor Advertising, video ads, Audience Segmentation for Ads>
+<Retargeting Campaigns, connectedTo, Geo_Targeting>
+<Return on Ad Spend Calculation, connectedTo, Competitor Ad Analysis>
+<Search Engine Ads, connectedTo, Competitor Ad Analysis>
+<Search Engine Ads, targets audiences, Outdoor Advertising>
diff --git a/test/graphviz/scanned_medium/graphviz_66.dot b/test/graphviz/scanned_medium/graphviz_66.dot
new file mode 100644
index 0000000000000000000000000000000000000000..3725e6321113c2e3ad24d9e519b5c4057e9bdec9
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_66.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=TD
+	N0 [label="Decentralized Autonomous Organizations" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N1 [label="Fiat On or Off Ramps" color="#94C0C0" fillcolor="#CADEDE" shape=hexagon style=filled]
+	N2 [label="Initial Exchange Offering" color="#388E3C" fillcolor="#F1F8E9" shape=box style=filled]
+	N3 [label="Key Management" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N4 [label="Token Generation Event" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N5 [label="Venture Capital Funding" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N6 [label="Security Audits" color="#94C0C0" fillcolor="#CADEDE" shape=oval style=filled]
+	N7 [label="Portfolio Management" color="#94C0C0" fillcolor="#CADEDE" shape=diamond style=filled]
+	N8 [label="Legal Advisory for Crypto" color="#94C0C0" fillcolor="#CADEDE" shape=ellipse style=filled]
+	N0 -> N1 [label="ensures interoperability" color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="explores new chains" color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="provides liquidity" color="#94C0C0" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#94C0C0" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#8C9EFF" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label="creates coins" color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N8 [label="analyzes markets" color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_68.dot b/test/graphviz/scanned_medium/graphviz_68.dot
new file mode 100644
index 0000000000000000000000000000000000000000..2f0cad7341fe12b9c88f0710568353ad86b79d47
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_68.dot
@@ -0,0 +1,20 @@
+digraph {
+	rankdir=TD
+	N0 [label="Smart Home Devices" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N1 [label="Transportation IoT" color="#FF8A65" fillcolor="#FBE9E7" shape=box style=filled]
+	N2 [label="Data Processing at Edge" color="#E91E63" fillcolor="#F8BBD0" shape=oval style=filled]
+	N3 [label="Asset Tracking" color="#E91E63" fillcolor="#F8BBD0" shape=box style=filled]
+	N4 [label="Supply Chain Optimization" color="#E91E63" fillcolor="#F8BBD0" shape=folder style=filled]
+	N5 [label="Data Privacy in IoT" color="#FF8A65" fillcolor="#FBE9E7" shape=plaintext style=filled]
+	N6 [label="Data Analysis in Cloud" color="#64B5F6" fillcolor="#E3F2FD" shape=ellipse style=filled]
+	N7 [label="Predictive Maintenance" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N0 -> N1 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="monitors healthcare" color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label="controls devices" color="#FF8A65" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="collects data" color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#64B5F6" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#FF8A65" dir=forward penwidth=1.5 style=solid]
+	N7 -> N5 [label="enables wearables" color="#64B5F6" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N1 [label="tracks assets" color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_69.txt b/test/graphviz/scanned_medium/graphviz_69.txt
new file mode 100644
index 0000000000000000000000000000000000000000..237e82aa286bd090ca9d641b7b6a9accb0586656
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_69.txt
@@ -0,0 +1,9 @@
+<Compliance and Governance at Edge, synchronizes data, Remote Device Management>
+<Edge Computing Hardware Selection, orchestrates containers, Local AI or ML Inference>
+<Edge Data Processing, connectedTo, Edge Device Provisioning>
+<Edge Device Provisioning, processes data locally, Fleet Management for Edge Devices>
+<Fleet Management for Edge Devices, manages fleet, Network Optimization for Edge>
+<Fleet Management for Edge Devices, optimizes telecoms, Local AI or ML Inference>
+<Local AI or ML Inference, analyzes data at edge, Compliance and Governance at Edge>
+<Network Optimization for Edge, connectedTo, Edge Computing Hardware Selection>
+<Remote Device Management, connectedTo, Virtualization at Edge>
diff --git a/test/graphviz/scanned_medium/graphviz_7.dot b/test/graphviz/scanned_medium/graphviz_7.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c5867071d378ee58164af0a4a94e879c5245dbbf
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_7.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=TD
+	N0 [label="Pipeline Monitoring" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N1 [label="Nuclear Reactor Control" color="#DCE775" fillcolor="#FCFCE7" shape=octagon style=filled]
+	N2 [label="Power Plant" color="#FF9800" fillcolor="#FFE0B2" shape=ellipse style=filled]
+	N3 [label="Energy Infrastructure Planning" color="#DCE775" fillcolor="#FCFCE7" shape=octagon style=filled]
+	N4 [label="Wind Turbine Monitoring" color="#DCE775" fillcolor="#FCFCE7" shape=parallelogram style=filled]
+	N5 [label="Sensor Reading" color="#FF9800" fillcolor="#FFE0B2" shape=hexagon style=filled]
+	N6 [label="Transformer Station" color="#DCE775" fillcolor="#FCFCE7" shape=box style=filled]
+	N7 [label="Transmission Line Maintenance" color="#DCE775" fillcolor="#FCFCE7" shape=ellipse style=filled]
+	N8 [label="Hydropower Generation" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N9 [label="Power Backup" color="#82DAFF" fillcolor="#C8EDFF" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=installs color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=trades color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [label=automates color="#FF9800" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=generates color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=isolates color="#82DAFF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N9 [color="#DCE775" dir=forward penwidth=1.5 style=solid]
+	N5 -> N8 [color="#82DAFF" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_74.txt b/test/graphviz/scanned_medium/graphviz_74.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8825a962687c4548e3cf4912bae79132942d40da
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_74.txt
@@ -0,0 +1,9 @@
+<Circuit Design, connectedTo, Documentation>
+<Component Selection, controls actuators, Schematic Capture>
+<Documentation, selects materials, Quality Control>
+<Environmental Testing, connectedTo, Circuit Design>
+<PCB Layout, troubleshoots issues, Troubleshooting and Debugging>
+<Quality Control, connectedTo, PCB Layout>
+<Schematic Capture, connectedTo, Documentation>
+<Schematic Capture, connectedTo, Environmental Testing>
+<Troubleshooting and Debugging, designs FPGAs, PCB Layout>
diff --git a/test/graphviz/scanned_medium/graphviz_75.dot b/test/graphviz/scanned_medium/graphviz_75.dot
new file mode 100644
index 0000000000000000000000000000000000000000..0e35cab672bcb41fac3d424fb51e2086cf5b86dd
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_75.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=RL
+	N0 [label=Prototyping color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N1 [label="In_App Purchase Integration" color="#42A5F5" fillcolor="#F1F8FF" shape=folder style=filled]
+	N2 [label="User Experience Design" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N3 [label="Concept Development" color="#FF9800" fillcolor="#FFE0B2" shape=box style=filled]
+	N4 [label="Accessibility Features" color="#42A5F5" fillcolor="#F1F8FF" shape=plaintext style=filled]
+	N5 [label="Wearable Device Integration" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N6 [label="Performance Optimization" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N7 [label=Wireframing color="#795548" fillcolor="#D7CCC8" shape=hexagon style=filled]
+	N8 [label="IoT Device Control via App" color="#795548" fillcolor="#D7CCC8" shape=box style=filled]
+	N9 [label="Chat Functionality" color="#42A5F5" fillcolor="#F1F8FF" shape=ellipse style=filled]
+	N0 -> N1 [label="designs widgets" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label="optimizes performance" color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="designs APIs" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#42A5F5" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#FF9800" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#795548" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label="uses geolocation" color="#795548" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N2 [color="#FF9800" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_75.txt b/test/graphviz/scanned_medium/graphviz_75.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5f4895653873f30ab2272ca5805327850b441d09
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_75.txt
@@ -0,0 +1,10 @@
+<Accessibility Features, connectedTo, User Experience Design>
+<Accessibility Features, connectedTo, Wearable Device Integration>
+<Concept Development, connectedTo, Accessibility Features>
+<In_App Purchase Integration, optimizes performance, User Experience Design>
+<IoT Device Control via App, uses geolocation, Chat Functionality>
+<Performance Optimization, connectedTo, Wireframing>
+<Prototyping, designs widgets, In_App Purchase Integration>
+<User Experience Design, designs APIs, Concept Development>
+<Wearable Device Integration, connectedTo, Performance Optimization>
+<Wireframing, connectedTo, IoT Device Control via App>
diff --git a/test/graphviz/scanned_medium/graphviz_76.dot b/test/graphviz/scanned_medium/graphviz_76.dot
new file mode 100644
index 0000000000000000000000000000000000000000..49c8777525b3cf7d1351c2b36cffa5907c89ed5d
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_76.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=RL
+	N0 [label="Crisis Communication Plan" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N1 [label="Crisis Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=plaintext style=filled]
+	N2 [label="Paid Social Media Advertising" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N3 [label="Link_in_Bio Optimization" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N4 [label="Community Management" color="#EAEFA5" fillcolor="#FDFCEB" shape=box style=filled]
+	N5 [label="Story Format Content Creation" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N6 [label="Platform Selection" color="#7E57C2" fillcolor="#EDE7F6" shape=box style=filled]
+	N7 [label=Cross_Promotion color="#EAEFA5" fillcolor="#FDFCEB" shape=hexagon style=filled]
+	N8 [label="Content Creation" color="#A188DB" fillcolor="#DED7F0" shape=oval style=filled]
+	N9 [label="Influencer Collaboration" color="#7E57C2" fillcolor="#EDE7F6" shape=ellipse style=filled]
+	N10 [label="Reels or Short Video Production" color="#EAEFA5" fillcolor="#FDFCEB" shape=ellipse style=filled]
+	N0 -> N1 [label="grows followers" color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label="forms partnerships" color="#EAEFA5" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label="produces reels" color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label="analyzes engagement" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label="curates UGC" color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label="manages campaigns" color="#EAEFA5" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="runs polls" color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N8 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N0 [label="builds personal brands" color="#A188DB" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_78.dot b/test/graphviz/scanned_medium/graphviz_78.dot
new file mode 100644
index 0000000000000000000000000000000000000000..9dff1d65069cceb6782f71240d179688786dbb18
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_78.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=RL
+	N0 [label="Digital Signatures" color="#73C6BC" fillcolor="#D0EFEE" shape=ellipse style=filled]
+	N1 [label="Attribute Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=Mdiamond style=filled]
+	N2 [label="Data Encryption for Identity" color="#6FE1D5" fillcolor="#C9EFEC" shape=ellipse style=filled]
+	N3 [label="Customer Identity and Access Management" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N4 [label="Identity Lifecycle Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N5 [label="Credential Management" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N6 [label="Identity Proofing" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N7 [label="Social Login Integration" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N8 [label="Consent Management" color="#73C6BC" fillcolor="#D0EFEE" shape=box style=filled]
+	N9 [label="KYC Integration" color="#4CAF50" fillcolor="#C8E6C9" shape=box style=filled]
+	N10 [label="Risk_Based Authentication" color="#4CAF50" fillcolor="#C8E6C9" shape=ellipse style=filled]
+	N0 -> N1 [color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#73C6BC" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="enables MFA" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label="implements PAM" color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label="revokes access" color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="issues certificates" color="#4CAF50" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="protects data" color="#6FE1D5" dir=forward penwidth=1.5 style=solid]
+	N6 -> N4 [color="#4CAF50" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N0 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_78.txt b/test/graphviz/scanned_medium/graphviz_78.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ad527a8ce92d6c5ef53b42990c96a72bb787a1da
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_78.txt
@@ -0,0 +1,12 @@
+<Attribute Management, connectedTo, Data Encryption for Identity>
+<Consent Management, issues certificates, KYC Integration>
+<Credential Management, revokes access, Identity Proofing>
+<Customer Identity and Access Management, connectedTo, Identity Lifecycle Management>
+<Data Encryption for Identity, connectedTo, Digital Signatures>
+<Data Encryption for Identity, enables MFA, Customer Identity and Access Management>
+<Digital Signatures, connectedTo, Attribute Management>
+<Identity Lifecycle Management, implements PAM, Credential Management>
+<Identity Proofing, connectedTo, Identity Lifecycle Management>
+<Identity Proofing, connectedTo, Social Login Integration>
+<KYC Integration, protects data, Risk_Based Authentication>
+<Social Login Integration, connectedTo, Consent Management>
diff --git a/test/graphviz/scanned_medium/graphviz_79.dot b/test/graphviz/scanned_medium/graphviz_79.dot
new file mode 100644
index 0000000000000000000000000000000000000000..ba8b12ed22371de439fed5c9b67e8887d78db74f
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_79.dot
@@ -0,0 +1,25 @@
+digraph {
+	rankdir=TD
+	N0 [label="Course Evaluation" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N1 [label="Accessibility Features" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N2 [label="Online Tutoring" color="#8C9EFF" fillcolor="#D3D7EB" shape=box style=filled]
+	N3 [label="Virtual Field Trips" color="#4DD0E1" fillcolor="#C9F0F0" shape=octagon style=filled]
+	N4 [label="Enrollment and Retention Strategies" color="#C0CA33" fillcolor="#F9FBE7" shape=oval style=filled]
+	N5 [label="Asynchronous Learning" color="#C0CA33" fillcolor="#F9FBE7" shape=box style=filled]
+	N6 [label="Bootcamp Development" color="#8C9EFF" fillcolor="#D3D7EB" shape=parallelogram style=filled]
+	N7 [label="Virtual Classroom Facilitation" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N8 [label="Adaptive Learning Technologies" color="#C0CA33" fillcolor="#F9FBE7" shape=ellipse style=filled]
+	N9 [label="Certification Issuance" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N10 [label="Student Progress Tracking" color="#8C9EFF" fillcolor="#D3D7EB" shape=ellipse style=filled]
+	N0 -> N1 [label="trains educators" color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label="offers online tutoring" color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#C0CA33" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="provides digital textbooks" color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#8C9EFF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label="provides OER" color="#4DD0E1" dir=forward penwidth=1.5 style=solid]
+	N9 -> N10 [label="hosts MOOCs" color="#C0CA33" dir=forward penwidth=1.5 style=solid]
+	N0 -> N4 [color="#4DD0E1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_8.dot b/test/graphviz/scanned_medium/graphviz_8.dot
new file mode 100644
index 0000000000000000000000000000000000000000..d2b963e308bb08ce51aba09280e4408bbfa717c9
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_8.dot
@@ -0,0 +1,19 @@
+digraph {
+	rankdir=RL
+	N0 [label="Plea Bargain" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N1 [label="Discovery Process" color="#BDBDBD" fillcolor="#F5F5F5" shape=oval style=filled]
+	N2 [label="Amicus Brief Submission" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N3 [label="Due Diligence" color="#BDBDBD" fillcolor="#F5F5F5" shape=parallelogram style=filled]
+	N4 [label="Settlement Negotiation" color="#A1887F" fillcolor="#EFEBE9" shape=octagon style=filled]
+	N5 [label=Enforcement color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N6 [label="Trademark Registration" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N7 [label="Client Interview" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label=files color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=protects color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=represents color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N5 [label=hears color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_82.txt b/test/graphviz/scanned_medium/graphviz_82.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d301f1f014412dd7b47294ee5df0c3e6d47357c3
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_82.txt
@@ -0,0 +1,10 @@
+<AI_Powered Language Tutors, connectedTo, Immersion Programs>
+<Certification Exam Preparation, listens, Gamified Learning Activities>
+<Curriculum Customization, distributes, Slang and Idioms Learning>
+<Error Correction Feedback, writes, AI_Powered Language Tutors>
+<Gamified Learning Activities, motivates, Curriculum Customization>
+<Immersion Programs, tests, Certification Exam Preparation>
+<Language Assessment Tests, teaches, Error Correction Feedback>
+<Progress Tracking, facilitates, Language Assessment Tests>
+<Slang and Idioms Learning, connectedTo, Language Assessment Tests>
+<Slang and Idioms Learning, connectedTo, Progress Tracking>
diff --git a/test/graphviz/scanned_medium/graphviz_83.dot b/test/graphviz/scanned_medium/graphviz_83.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dc598ac09c962a998427e7e08b1436e886b7d627
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_83.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=RL
+	N0 [label="Medication Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N1 [label="Art Therapy" color="#BDBDBD" fillcolor="#F5F5F5" shape=plaintext style=filled]
+	N2 [label="Relapse Prevention" color="#FFB74D" fillcolor="#FFF3E0" shape=hexagon style=filled]
+	N3 [label="Anxiety Management" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N4 [label="Crisis Intervention" color="#FFB74D" fillcolor="#FFF3E0" shape=diamond style=filled]
+	N5 [label="Post_Traumatic Stress Disorder Support" color="#7E57C2" fillcolor="#D1C4E9" shape=ellipse style=filled]
+	N6 [label="Family Therapy" color="#FFB74D" fillcolor="#FFF3E0" shape=folder style=filled]
+	N7 [label="Eating Disorder Treatment" color="#BDBDBD" fillcolor="#F5F5F5" shape=box style=filled]
+	N8 [label="Dialectical Behavior Therapy" color="#7E57C2" fillcolor="#D1C4E9" shape=parallelogram style=filled]
+	N9 [label="Treatment Plan Development" color="#BDBDBD" fillcolor="#F5F5F5" shape=ellipse style=filled]
+	N0 -> N1 [label=licenses color="#7E57C2" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#FFB74D" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [label=treats color="#000000" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=monitors color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=facilitates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N6 -> N7 [color="#FFB74D" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=therapies color="#BDBDBD" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#7E57C2" dir=forward penwidth=1.5 style=solid]
+	N9 -> N6 [color="#BDBDBD" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_84.dot b/test/graphviz/scanned_medium/graphviz_84.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c5ae268a420b86fdfc92a8bc6de40f3056098125
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_84.dot
@@ -0,0 +1,26 @@
+digraph {
+	rankdir=LR
+	N0 [label="Dietary Assessment" color="#D3EB9F" fillcolor="#F8FDD3" shape=ellipse style=filled]
+	N1 [label="Grocery Shopping Guidance" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N2 [label="Recipe Adaptation" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N3 [label="Eating Habit Modification" color="#D3EB9F" fillcolor="#F8FDD3" shape=hexagon style=filled]
+	N4 [label="Meal Planning" color="#A2D0FF" fillcolor="#E8F0FF" shape=Mdiamond style=filled]
+	N5 [label="Community Nutrition Workshops" color="#D3EB9F" fillcolor="#F8FDD3" shape=parallelogram style=filled]
+	N6 [label="Macronutrient Tracking" color="#A2D0FF" fillcolor="#E8F0FF" shape=box style=filled]
+	N7 [label="Clinical Nutrition Support" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N8 [label="Public Health Nutrition Programs" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N9 [label="Agricultural Nutrition Impact" color="#FFEB3B" fillcolor="#FFF9C4" shape=folder style=filled]
+	N10 [label="Personalized Nutrition Plans" color="#A2D0FF" fillcolor="#E8F0FF" shape=ellipse style=filled]
+	N0 -> N1 [label=calculates color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#FFEB3B" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=analyzes color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=personalizes color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#A2D0FF" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=certifies color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=manages color="#A2D0FF" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=develops color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N10 -> N9 [label=improves color="#D3EB9F" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N4 [label=balances color="#000000" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_86.txt b/test/graphviz/scanned_medium/graphviz_86.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2c4d57ef71640d227cb652c49901a0e4ced4e2c1
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_86.txt
@@ -0,0 +1,11 @@
+<Acupuncture Consultation, connectedTo, Burnout Prevention>
+<Behavior Change Support, certifies, Financial Wellness Planning>
+<Behavior Change Support, enhances, Nature Connection>
+<Breathwork Exercises, manages, Behavior Change Support>
+<Burnout Prevention, connectedTo, Work_Life Balance Coaching>
+<Chiropractic Care, motivates, Breathwork Exercises>
+<Environmental Wellness, counsels, Nature Connection>
+<Journaling for Wellness, guides, Environmental Wellness>
+<Nature Connection, connectedTo, Stress Management>
+<Stress Management, assesses, Acupuncture Consultation>
+<Work_Life Balance Coaching, coaches, Chiropractic Care>
diff --git a/test/graphviz/scanned_medium/graphviz_89.txt b/test/graphviz/scanned_medium/graphviz_89.txt
new file mode 100644
index 0000000000000000000000000000000000000000..02016e8e53de68d5fb811f6db5fd863d6caa4f02
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_89.txt
@@ -0,0 +1,9 @@
+<Aerial Photography, connectedTo, Wildlife Tracking>
+<Counter_Drone Systems, connectedTo, Security Surveillance>
+<Drone Data Security, connectedTo, Endurance Optimization>
+<Drone Design, connectedTo, Counter_Drone Systems>
+<Endurance Optimization, automates, Drone Design>
+<Geofencing Implementation, transmits, Drone Data Security>
+<Propulsion System Development, connectedTo, Geofencing Implementation>
+<Security Surveillance, monitors, Aerial Photography>
+<Wildlife Tracking, visualizes, Propulsion System Development>
diff --git a/test/graphviz/scanned_medium/graphviz_9.dot b/test/graphviz/scanned_medium/graphviz_9.dot
new file mode 100644
index 0000000000000000000000000000000000000000..dee7114475a1a514fa661b2f67286c2ded96123a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_9.dot
@@ -0,0 +1,27 @@
+digraph {
+	rankdir=RL
+	N0 [label="Delivery Confirmation" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N1 [label="Route Assignment" color="#A188DB" fillcolor="#DED7F0" shape=diamond style=filled]
+	N2 [label="Yard Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N3 [label="Customs Declaration" color="#A188DB" fillcolor="#DED7F0" shape=ellipse style=filled]
+	N4 [label="Hazardous Material Transport" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N5 [label="Packing Process" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N6 [label="Container Loading" color="#A188DB" fillcolor="#DED7F0" shape=hexagon style=filled]
+	N7 [label="Demand Forecasting Integration" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N8 [label="Damage Reporting" color="#A188DB" fillcolor="#DED7F0" shape=parallelogram style=filled]
+	N9 [label="Hub Transfer" color="#CB9BE1" fillcolor="#F2E6F5" shape=parallelogram style=filled]
+	N10 [label="Global Trade Compliance" color="#FFE470" fillcolor="#FFFAE0" shape=oval style=filled]
+	N11 [label="Order Picking" color="#FFE470" fillcolor="#FFFAE0" shape=ellipse style=filled]
+	N0 -> N1 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=packs color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=notifies color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N4 -> N5 [label="picks up" color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#FFE470" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=expedites color="#A188DB" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+	N8 -> N9 [label=plans color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N10 [label=stores color="#A188DB" dir=forward penwidth=1.5 style=solid]
+	N10 -> N11 [color="#FFE470" dir=forward penwidth=1.5 style=dashed]
+	N9 -> N11 [color="#CB9BE1" dir=forward penwidth=1.5 style=dashed]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_90.dot b/test/graphviz/scanned_medium/graphviz_90.dot
new file mode 100644
index 0000000000000000000000000000000000000000..813930e9464f82cfa74833652a76db9851a092cc
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_90.dot
@@ -0,0 +1,22 @@
+digraph {
+	rankdir=BT
+	N0 [label="Vehicle_to_Infrastructure Communication" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N1 [label="Regulatory Compliance" color="#C2B2F0" fillcolor="#EFE6FF" shape=Mdiamond style=filled]
+	N2 [label="Map Data Management" color="#FFF176" fillcolor="#FFFDE7" shape=hexagon style=filled]
+	N3 [label="Decision_Making Algorithms" color="#FFF176" fillcolor="#FFFDE7" shape=box style=filled]
+	N4 [label="Accident Reconstruction for AVs" color="#FFF176" fillcolor="#FFFDE7" shape=ellipse style=filled]
+	N5 [label="Over_the_Air Updates" color="#4DB6AC" fillcolor="#E0F2F1" shape=hexagon style=filled]
+	N6 [label="Perception System" color="#4DB6AC" fillcolor="#E0F2F1" shape=Mdiamond style=filled]
+	N7 [label="Motion Control" color="#C2B2F0" fillcolor="#EFE6FF" shape=box style=filled]
+	N8 [label="Data Collection and Annotation" color="#C2B2F0" fillcolor="#EFE6FF" shape=ellipse style=filled]
+	N0 -> N1 [label=certifies color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=transports color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [label=upgrades color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#4DB6AC" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=alerts color="#FFF176" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N4 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N0 -> N3 [label=localizes color="#4DB6AC" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_93.dot b/test/graphviz/scanned_medium/graphviz_93.dot
new file mode 100644
index 0000000000000000000000000000000000000000..54b326216b8e3684172a02eaa71a3f602dad527a
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_93.dot
@@ -0,0 +1,24 @@
+digraph {
+	rankdir=TD
+	N0 [label="Dynamic Pricing" color="#F44336" fillcolor="#FFCDD2" shape=ellipse style=filled]
+	N1 [label="Box Office Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N2 [label="Ticket Sales" color="#F44336" fillcolor="#FFCDD2" shape=box style=filled]
+	N3 [label="API Integration for Partners" color="#CD8FF2" fillcolor="#ECCFF5" shape=oval style=filled]
+	N4 [label="Personalized Ticket Offers" color="#F44336" fillcolor="#FFCDD2" shape=octagon style=filled]
+	N5 [label="Biometric Ticketing" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N6 [label="Mobile Ticketing" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N7 [label="Order Confirmation" color="#F44336" fillcolor="#FFCDD2" shape=parallelogram style=filled]
+	N8 [label="Museum Ticketing" color="#CB9BE1" fillcolor="#F2E6F5" shape=box style=filled]
+	N9 [label="Agent Network Management" color="#CB9BE1" fillcolor="#F2E6F5" shape=ellipse style=filled]
+	N0 -> N1 [color="#F44336" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [label=validates color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [label=develops color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=issues color="#000000" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [label=promotes color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#CD8FF2" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [color="#CB9BE1" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N0 [label=refunds color="#F44336" dir=forward penwidth=1.5 style=solid]
+	N8 -> N5 [label=manages color="#F44336" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_96.txt b/test/graphviz/scanned_medium/graphviz_96.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cb6f78f9d5a2af7bff04afd50a53554559feadb4
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_96.txt
@@ -0,0 +1,10 @@
+<Citation Management, connectedTo, Research Collaboration>
+<Intellectual Property in Research, evaluates, Thesis or Dissertation Writing>
+<Open Science Practices, connectedTo, Power Analysis>
+<Power Analysis, cites, Software for Statistical Analysis>
+<Presentation at Conferences, connectedTo, Open Science Practices>
+<Public Engagement with Research, develops, Open Science Practices>
+<Research Collaboration, connectedTo, Intellectual Property in Research>
+<Software for Statistical Analysis, licenses, Citation Management>
+<Thesis or Dissertation Writing, peer review, Power Analysis>
+<Thesis or Dissertation Writing, theorizes, Public Engagement with Research>
diff --git a/test/graphviz/scanned_medium/graphviz_97.dot b/test/graphviz/scanned_medium/graphviz_97.dot
new file mode 100644
index 0000000000000000000000000000000000000000..1a55386d65883b7e9d15aeaea2b251fe610f0ef6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_97.dot
@@ -0,0 +1,21 @@
+digraph {
+	rankdir=BT
+	N0 [label="Integrated Library Systems" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N1 [label="AI in Library Services" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N2 [label="Resource Sharing Networks" color="#E91E63" fillcolor="#F8BBD0" shape=ellipse style=filled]
+	N3 [label="Reference Desk Support" color="#4285F4" fillcolor="#D0E0F8" shape=box style=filled]
+	N4 [label="User Account Management" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N5 [label="Mobile App for Library" color="#4285F4" fillcolor="#D0E0F8" shape=octagon style=filled]
+	N6 [label="Search Functionality" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N7 [label="Automated Materials Handling" color="#6FE1D5" fillcolor="#C9EFEC" shape=box style=filled]
+	N8 [label="Patron Services" color="#4285F4" fillcolor="#D0E0F8" shape=ellipse style=filled]
+	N0 -> N1 [label=indexes color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N1 -> N2 [label=protects color="#6FE1D5" dir=forward penwidth=1.5 style=dashed]
+	N2 -> N3 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N3 -> N4 [color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [label=migrates color="#000000" dir=forward penwidth=1.5 style=dashed]
+	N5 -> N6 [label=analyzes color="#E91E63" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [color="#E91E63" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N8 [label=retrieves color="#4285F4" dir=forward penwidth=1.5 style=solid]
+	N0 -> N6 [label=borrows color="#E91E63" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_98.dot b/test/graphviz/scanned_medium/graphviz_98.dot
new file mode 100644
index 0000000000000000000000000000000000000000..b2a5909a40fe77a898e5d5320981ada05a4758f6
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_98.dot
@@ -0,0 +1,23 @@
+digraph {
+	rankdir=LR
+	N0 [label="Grant Writing for Archives" color="#4DD0E1" fillcolor="#C9F0F0" shape=ellipse style=filled]
+	N1 [label="Long_Term Digital Preservation" color="#388E3C" fillcolor="#F1F8E9" shape=hexagon style=filled]
+	N2 [label="Disaster Preparedness for Archives" color="#4DD0E1" fillcolor="#C9F0F0" shape=oval style=filled]
+	N3 [label="Security of Holdings" color="#4DD0E1" fillcolor="#C9F0F0" shape=box style=filled]
+	N4 [label="User Interface for Digital Archives" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N5 [label="Researchers Support" color="#90A4AE" fillcolor="#ECEFF1" shape=hexagon style=filled]
+	N6 [label="Finding Aid Creation" color="#4DD0E1" fillcolor="#C9F0F0" shape=plaintext style=filled]
+	N7 [label="Outreach and Education" color="#4DD0E1" fillcolor="#C9F0F0" shape=hexagon style=filled]
+	N8 [label="Provenance Tracking" color="#388E3C" fillcolor="#F1F8E9" shape=diamond style=filled]
+	N9 [label="Ethical Use of Archival Materials" color="#388E3C" fillcolor="#F1F8E9" shape=ellipse style=filled]
+	N0 -> N1 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N1 -> N2 [label=secures color="#000000" dir=forward penwidth=1.5 style=solid]
+	N2 -> N3 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N3 -> N4 [color="#000000" dir=forward penwidth=1.5 style=solid]
+	N4 -> N5 [color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N5 -> N6 [color="#388E3C" dir=forward penwidth=1.5 style=solid]
+	N6 -> N7 [label=audits color="#000000" dir=forward penwidth=1.5 style=solid]
+	N7 -> N8 [label=policies color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+	N8 -> N9 [label=publishes color="#90A4AE" dir=forward penwidth=1.5 style=dashed]
+	N7 -> N5 [label=exhibits color="#90A4AE" dir=forward penwidth=1.5 style=solid]
+}
diff --git a/test/graphviz/scanned_medium/graphviz_99.txt b/test/graphviz/scanned_medium/graphviz_99.txt
new file mode 100644
index 0000000000000000000000000000000000000000..35fed62cfd223811bef01b4d6bde573296e433f9
--- /dev/null
+++ b/test/graphviz/scanned_medium/graphviz_99.txt
@@ -0,0 +1,11 @@
+<3D Printing for Replicas, connectedTo, Exhibition Lighting Design>
+<Crowdsourcing for Collections, connectedTo, Online Shop Integration>
+<Digital Storytelling, connectedTo, Crowdsourcing for Collections>
+<Digital Storytelling, engages, Online Shop Integration>
+<Exhibition Lighting Design, connectedTo, Interactive Kiosks>
+<Fundraising Technology, manages, Security Systems Integration>
+<Interactive Kiosks, tracks, Fundraising Technology>
+<Online Shop Integration, integrates, RFID for Object Tracking>
+<RFID for Object Tracking, collects, Exhibition Lighting Design>
+<RFID for Object Tracking, models, 3D Printing for Replicas>
+<Security Systems Integration, analyzes, Visitor Flow Analysis>