#    ____  ____  ____  ________  ____  ____  ____
# __|A   ||Z   ||B   ||Z       ||A   ||Z   ||B   |__
#
0 1 A
2 1 A
2 1 Z
4 1 Z
4 1 B
6 1 B
6 1 Z
10 1 Z
10 1 A
12 1 A
12 1 Z
14 1 Z
14 1 B
16 1 B
