lsd_2

0 2
0 -> 1
1 -> 2

1 2
0 -> 3
1 -> 5

2 3
0 -> 4
1 -> 6

3 2
0 -> 3
1 -> 3

4 3
0 -> 4
1 -> 4

5 4
0 -> 7
1 -> 8

6 1
0 -> 6
1 -> 6

7 4
0 -> 9
1 -> 11

8 0
0 -> 10
1 -> 9

9 4
0 -> 9
1 -> 9

10 0
0 -> 10
1 -> 10

11 4
0 -> 12
1 -> 9

12 4
0 -> 9
1 -> 5