(START) |- 0
0 a 1
0 b 1
1 a 2
1 b 2
2 a 3
2 b 3
3 a 4
3 b 4
4 a 5
4 b 5
5 a 6
5 b 6
6 a 7
6 b 7
7 a 8
7 b 8
8 a 9
8 b 9
9 a 10
10 a 11
10 b 11
11 a 12
11 b 12
12 a 13
12 b 13
13 a 14
13 b 14
14 a 15
14 b 15
15 a 16
15 b 16
16 a 17
16 b 17
17 a 18
17 b 18
18 a 19
0 a 10
1 a 10
2 a 10
3 a 10
4 a 10
5 a 10
6 a 10
7 a 10
8 a 10
9 b 19
19 -| (FINAL)
