Graph Nodes:
X1;X2;X3;X4;X5;X6;X7;X8;X9;X10;X11

Graph Edges:
1. X2 --> X1
2. X4 --> X2
3. X7 --> X6
4. X8 --> X1
5. X8 --> X2
6. X8 --> X3
7. X8 --> X4
8. X8 --> X5
9. X8 --> X11
10. X9 --> X3
11. X9 --> X4
12. X9 --> X5
13. X9 --> X8
14. X9 --> X11
15. X10 --> X6
16. X10 --> X7
17. X11 --> X4
