0 A
1 A
1 B
2 A
2 B
3 A
3 B
4 A
4 B
5 A
5 B
6 A
6 B
7 A
7 B
8 A
8 B
9 A
9 B
10 A
10 B
11 A
11 B
12 A
12 B