Consider the following premises. T(a_8) -> r_1. p -> r_1. S_8(a_8) -> p. forall x_8: T(x_8) or S_8(x_8). Can we infer r_1 from them? If possible, name the inference rules being used at each step.
 From forall x_8: T(x_8) or S_8(x_8) we can infer T(a_8) or S_8(a_8) via universal instantiation. From S_8(a_8) -> p, p -> r_1 we can infer S_8(a_8) -> r_1 via transitivity. Finally, from T(a_8) -> r_1, S_8(a_8) -> r_1, T(a_8) or S_8(a_8) we can infer r_1 via disjunction elimination. Therefore, the answer is yes.