4 10
1 1 0.0
1 2 1.0761109277672596
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -1.7526554682677618
2 4 0.0
3 3 0.0
3 4 0.17239934958616523
4 4 0.0