A 0 1 R B
A 1 0 L C
B 0 1 L A
B 1 1 R C
C 0 1 R A
C 1 0 L D
D 0 1 L E
D 1 1 L C
E 0 1 R F
E 1 1 R A
F 0 1 R A
F 1 1 R E
