4 10
1 1 0.0
1 2 0.05042797662191861
1 3 0.0
1 4 0.0
2 2 0.0
2 3 1.0673789036098933
2 4 0.0
3 3 0.0
3 4 -0.30417299932432584
4 4 0.0