(START) |- 0
0 a 1
0 b 1
1 a 2
1 b 2
2 a 3
2 b 3
3 a 4
4 a 5
4 b 5
5 a 6
5 b 6
6 a 7
0 a 4
1 a 4
2 a 4
3 b 7
7 -| (FINAL)
