7 28
1 1 0.0
1 2 0.10550671625883312
1 3 0.0
1 4 0.0
1 5 0.0
1 6 0.0
1 7 0.0
2 2 0.0
2 3 -0.5324211720789742
2 4 0.0
2 5 0.0
2 6 0.0
2 7 0.0
3 3 0.0
3 4 -0.5370553099011525
3 5 0.0
3 6 0.0
3 7 0.0
4 4 0.0
4 5 -1.259827203616056
4 6 0.0
4 7 0.0
5 5 0.0
5 6 1.6097830750884232
5 7 0.0
6 6 0.0
6 7 -0.7878819886830624
7 7 0.0