4 10
1 1 0.0
1 2 -0.4418021980163984
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -0.16410269227265487
2 4 0.0
3 3 0.0
3 4 -0.020884181921235243
4 4 0.0