Consider the following premises. P_18(e_2) -> p_2. forall x_18: P_18(x_18). Can we infer p_2 or s 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(e_2) via universal instantiation. From P_18(e_2) -> p_2, P_18(e_2) we can infer p_2 via modus ponens. Finally, from p_2 we can infer p_2 or s via addition. Therefore, the answer is yes.