start, #, 0, #, R
0, X, 1, X, R
0, #, 0a, #, R
1, X, 2, X, R
1, #, 1a, #, R
2, X, 0, X, R
2, #, 2a, #, R
0a, ?, stop, 0, -
1a, ?, stop, 1, -
2a, ?, stop, 2, -