0: Point 13, Edge 3 of polygon 0
1: Point 6, Edge 3 of polygon 0
2: Point 9, Edge 3 of polygon 0
3: Point 11, Edge 3 of polygon 0
4: Point 1
5: Point 17
6: Point 16
7: Point 3, Point 7
8: Point 3
9: Point 3
10: Point 3
11: Point 3
12: Point 3
13: Point 3, Point 7
14: Point 16
15: Point 17
16: Point 1
17: Point 11, Edge 3 of polygon 0
18: Point 9, Edge 3 of polygon 0
19: Point 6, Edge 3 of polygon 0
20: Point 13, Edge 3 of polygon 0