4 10
1 1 0.0
1 2 -1.3726384409679635
1 3 0.0
1 4 0.0
2 2 0.0
2 3 0.41307887170795365
2 4 0.0
3 3 0.0
3 4 0.6846900869434932
4 4 0.0