Consider the following premises. forall x: S(x). p_14 and p. Can we infer S(a_9) and p_14 from them? If possible, name the inference rules being used at each step.
 From p_14 and p we can infer p_14 via simplification. From forall x: S(x) we can infer S(a_9) via universal instantiation. Finally, from S(a_9), p_14 we can infer S(a_9) and p_14 via conjunction. Therefore, the answer is yes.