P 1
P 1-
P 2
P 1 2 1
P 1 1 2
P 2 2 2
P 2 3
P 2 2 21
P 2 21 21
P 21
P 1 21 1
P 1 21/c 1
P 1 1 21
P 21(C)
P 21 2 21
P 21 3
P 21 21 2
P 21 21 21