#    ____             ____       _________
# __|A   |___________|B   |_____|Z        |_______
#
#         ___________       ____           ____
# _______|Z          |_____|D   |_________|E   |__
#
#
0 1 A
2 1 A
0 2 Z
4 2 Z
2 1 B
4 1 B
4 2 D
6 2 D
4 1 Z
8 1 Z
6 2 E
8 2 E
