Graph Nodes:
X1;X2;X3;X4;X5;X6;X7;X8;X9;X10;X11;X12;X13;X14;X15;X16;X17;X18;X19;X20

Graph Edges:
1. X1 --> X18
2. X1 --- X2
3. X1 --- X3
4. X1 --- X7
5. X10 --> X18
6. X11 --> X17
7. X12 --- X14
8. X13 --> X17
9. X16 --> X19
10. X17 --> X19
11. X18 --> X19
12. X2 --> X11
13. X2 --> X18
14. X3 --> X10
15. X3 --> X11
16. X4 --> X14
17. X4 --> X17
18. X4 --> X18
19. X5 --- X12
20. X5 --> X14
21. X5 --- X9
22. X6 --> X10
23. X7 --- X15
24. X7 --> X18
25. X7 --> X19
26. X7 --- X20
27. X8 --> X11
28. X8 --- X13



Ambiguous triples (i.e. list of triples for which there is ambiguous data about whether they are colliders or not):
<X15, X7, X20>
<X7, X1, X2>
<X4, X14, X12>