lsd_3

0 2
0 -> 1
1 -> 2
2 -> 3

1 2
0 -> 1
1 -> 1
2 -> 1

2 3
0 -> 4
1 -> 5
2 -> 4

3 1
0 -> 3
1 -> 3
2 -> 3

4 3
0 -> 4
1 -> 4
2 -> 4

5 3
0 -> 4
1 -> 2
2 -> 6

6 0
0 -> 6
1 -> 6
2 -> 6