Consider the following premises. w <-> t. ~w. Q(a_13) -> t. forall x_13: Q(x_13) or S_13(x_13). Can we infer S_13(a_13) from them? If possible, name the inference rules being used at each step.
 From forall x_13: Q(x_13) or S_13(x_13) we can infer Q(a_13) or S_13(a_13) via universal instantiation. From w <-> t, ~w we can infer ~t via biconditional elimination. From Q(a_13) -> t, ~t we can infer ~Q(a_13) via modus tollens. Finally, from Q(a_13) or S_13(a_13), ~Q(a_13) we can infer S_13(a_13) via disjunctive syllogism. Therefore, the answer is yes.