Consider the following premises. forall y_4: R(y_4) <-> W(y_4). q -> W(a_7). R(a_7) or q. Can we infer W(a_7) from them? If possible, name the inference rules being used at each step.
 From forall y_4: R(y_4) <-> W(y_4) we can infer R(a_7) <-> W(a_7) via universal instantiation. From R(a_7) <-> W(a_7) we can infer R(a_7) -> W(a_7) via biconditional elimination. Finally, from R(a_7) -> W(a_7), q -> W(a_7), R(a_7) or q we can infer W(a_7) via disjunction elimination. Therefore, the answer is yes.