4 10
1 1 0.0
1 2 0.37971254463183596
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -1.6414234751340873
2 4 0.0
3 3 0.0
3 4 -1.5240204803702138
4 4 0.0