Consider the following premises. R_17(a_17) -> s. forall x_17: R_17(x_17) or S_17(x_17). p <-> s. S_17(a_17) -> s. Can we infer p from them? If possible, name the inference rules being used at each step.
 From forall x_17: R_17(x_17) or S_17(x_17) we can infer R_17(a_17) or S_17(a_17) via universal instantiation. From R_17(a_17) -> s, S_17(a_17) -> s, R_17(a_17) or S_17(a_17) we can infer s via disjunction elimination. From p <-> s we can infer s -> p via biconditional elimination. Finally, from s -> p, s we can infer p via modus ponens. Therefore, the answer is yes.