directed
14
1 5 1
1 6 1
1 12 1
2 5 1
2 9 1
2 3 1
3 6 1
3 7 1
3 10 1
4 3 1
4 7 1
4 14 1
5 8 1
6 9 1
6 13 1
7 6 1
9 8 1
10 11 1
10 12 1
11 14 1
13 10 1