msd_2

0 1
0 -> 0
1 -> 1

1 1
0 -> 2
1 -> 3

2 1
0 -> 1
1 -> 0

3 0
0 -> 4
1 -> 5

4 0
0 -> 4
1 -> 1

5 0
0 -> 6
1 -> 3

6 0
0 -> 5
1 -> 0
