4 10
1 1 0.0
1 2 -0.4925122976621154
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -0.04584503195185626
2 4 0.0
3 3 0.0
3 4 -2.037257589010572
4 4 0.0