Consider the following premises. forall x_18: P_18(x_18). p. P_18(a_18) -> q_1. Can we infer p and q_1 from them? If possible, name the inference rules being used at each step.
 From forall x_18: P_18(x_18) we can infer P_18(a_18) via universal instantiation. From P_18(a_18) -> q_1, P_18(a_18) we can infer q_1 via modus ponens. Finally, from p, q_1 we can infer p and q_1 via conjunction. Therefore, the answer is yes.