{0, 1}  msd_fib

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

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

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

3 1
1 0 -> 5

4 1
0 0 -> 2

5 0
0 0 -> 3
1 0 -> 0
