Consider the following premises. w. w -> S_8(i). forall x_8: W(x_8) -> S_8(x_8). Can we infer S_8(i) from them? If possible, name the inference rules being used at each step.
 From forall x_8: W(x_8) -> S_8(x_8) we can infer W(i) -> S_8(i) via universal instantiation. From w we can infer w or W(i) via addition. Finally, from w -> S_8(i), W(i) -> S_8(i), w or W(i) we can infer S_8(i) via disjunction elimination. Therefore, the answer is yes.