data/cycle/graph_structure/hard/graph1015.txt

26 27
20 5
9 2
3 20
21 24
5 17
14 9
8 6
21 20
14 15
13 9
1 0
23 16
13 25
20 2
8 20
10 22
10 21
18 0
16 15
2 0
16 12
19 18
4 7
17 11
19 16
1 5
7 15