Consider the following premises. q_6 -> S_12(a_12). forall x_12: R_12(x_12) <-> S_12(x_12). t -> q_6. Can we infer t -> R_12(a_12) from them? If possible, name the inference rules being used at each step.
 From forall x_12: R_12(x_12) <-> S_12(x_12) we can infer R_12(a_12) <-> S_12(a_12) via universal instantiation. From t -> q_6, q_6 -> S_12(a_12) we can infer t -> S_12(a_12) via transitivity. From R_12(a_12) <-> S_12(a_12) we can infer S_12(a_12) -> R_12(a_12) via biconditional elimination. Finally, from t -> S_12(a_12), S_12(a_12) -> R_12(a_12) we can infer t -> R_12(a_12) via transitivity. Therefore, the answer is yes.