4 10
1 1 0.0
1 2 -1.8907704563534788
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -0.00048366291763441175
2 4 0.0
3 3 0.0
3 4 -0.39693638431012584
4 4 0.0