0 -> M_P
0 -> M_T
M_T -> 0
M_P -> 0
0 -> P0
0 -> T0
P0 -> 0
P1 -> 0
P2 -> 0
T0 -> 0
T1 -> 0
T2 -> 0
P2 + T2 -> C
C -> 0
CN -> 0
C <-> CN
P0 -> P1
P1 -> P2
P1 -> P0
P2 -> P1
T0 -> T1
T1 -> T2
T1 -> T0
T2 -> T1
T2 -> 0
P2 -> 0