4 10
1 1 0.0
1 2 -0.07906018168662758
1 3 0.0
1 4 0.0
2 2 0.0
2 3 1.4060403460038549
2 4 0.0
3 3 0.0
3 4 -1.7074382354942605
4 4 0.0