Consider the following premises. ~q_4. q_4 or ~R_12(b). forall x_12: R_12(x_12) <-> S_12(x_12). Can we infer S_12(b) from them?
 From forall x_12: R_12(x_12) <-> S_12(x_12) we can infer R_12(b) <-> S_12(b). From q_4 or ~R_12(b) we can infer R_12(b) -> q_4. From R_12(b) -> q_4, ~q_4 we can infer ~R_12(b). Finally, from R_12(b) <-> S_12(b), ~R_12(b) we can infer ~S_12(b), which contradicts S_12(b). Therefore, the answer is no.