4 10
1 1 0.0
1 2 -0.7367380830041992
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -1.8020118913950616
2 4 0.0
3 3 0.0
3 4 0.08845213333852191
4 4 0.0