data/hamilton/graph_structure/hard/graph121.txt

13 30
8 5
2 5
10 11
7 2
5 4
5 1
8 2
4 8
4 10
1 10
9 10
11 2
6 2
7 5
7 12
7 8
1 3
8 11
5 11
9 0
6 12
9 11
4 9
8 3
2 12
8 6
1 2
4 12
2 10
11 3