/usr/share/doc/planarity/samples/Petersen.txt

N=10
1: 2 6 5 0
2: 3 7 1 0
3: 4 8 2 0
4: 5 9 3 0
5: 1 10 4 0
6: 1 8 9 0
7: 2 9 10 0
8: 3 10 6 0
9: 4 6 7 0
10: 5 7 8 0

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