Consider the following premises. S_8(a_8) <-> r. forall x_8: R_8(x_8) or S_8(x_8). R_8(a_8) -> r. Can we infer forall x_8: R_8(x_8) or S_8(x_8) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.