Consider the following premises. S_9(g) -> R_9(g). forall x_9: R_9(x_9) <-> S_9(x_9). Can we infer R_9(g) -> S_9(g) from them? If possible, name the inference rules being used at each step.
 From forall x_9: R_9(x_9) <-> S_9(x_9) we can infer R_9(g) <-> S_9(g) via universal instantiation. Finally, from R_9(g) <-> S_9(g) we can infer R_9(g) -> S_9(g) via biconditional elimination. Therefore, the answer is yes.