4 10
1 1 0.0
1 2 0.7575907431911835
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -0.19623045325213698
2 4 0.0
3 3 0.0
3 4 -0.19962839097240498
4 4 0.0