4 10
1 1 0.0
1 2 1.7079073095214208
1 3 0.0
1 4 0.0
2 2 0.0
2 3 -0.29459250752994653
2 4 0.0
3 3 0.0
3 4 1.4536071669448503
4 4 0.0