Consider the following premises. S_12(h) or ~R_12(h). forall x_12: R_12(x_12) <-> S_12(x_12). Can we infer R_12(h) <-> S_12(h) from them? If possible, name the inference rules being used at each step.
We can infer R_12(h) <-> S_12(h) via the universal instantiation rule. Therefore, the answer is yes.