Consider the following premises. forall y: R_3(y). forall x_5: R_3(x_5) -> S_5(x_5). Can we infer S_5(g) from them? If possible, name the inference rules being used at each step.
 From forall y: R_3(y) we can infer R_3(g) via universal instantiation. From forall x_5: R_3(x_5) -> S_5(x_5) we can infer R_3(g) -> S_5(g) via universal instantiation. Finally, from R_3(g) -> S_5(g), R_3(g) we can infer S_5(g) via modus ponens. Therefore, the answer is yes.