C_free + R_A -> RC_A
C_free + R_B -> RC_B
RC_A + R_B -> RC_AB
RC_B + R_A -> RC_AB
0 -> C_free + R_A
0 -> C_free + R_B
0 -> RC_B + R_B
0 -> RC_A + R_A
C_free -> 0
C_free -> 0
0 -> C_free
0 -> AP
AP -> 0
AD -> 0
0 -> C_free
0 -> R_A
0 -> R_B
R_A -> 0
R_B -> 0
RC_A -> 0
RC_B -> 0
RC_AB -> 0