#    ____             ____       _________
# __|R   |___________|S   |_____|Z        |_______
#
#         ___________       ____           ____
# _______|Z          |_____|R   |_________|S   |__
#
#
0 1 R
2 1 R
0 2 Z
4 2 Z
2 1 S
4 1 S
4 2 R
6 2 R
4 1 Z
8 1 Z
6 2 S
8 2 S