data/hamilton/graph_structure/hard/graph139.txt

13 28
12 4
3 5
0 2
7 9
10 4
3 9
12 8
7 6
1 11
10 8
4 7
12 1
2 3
2 9
11 8
7 3
11 12
11 9
8 6
0 7
4 8
5 2
1 7
3 12
5 12
6 4
9 1
1 3