4 10
1 1 0.0
1 2 -0.31155253212737266
1 3 0.0
1 4 0.0
2 2 0.0
2 3 0.05616534222974544
2 4 0.0
3 3 0.0
3 4 -1.1651498407833565
4 4 0.0