Consider the following premises. forall x_8: R_8(x_8) or S_8(x_8). R_8(a_8) -> r. S_8(a_8) <-> r. Can we infer r from them?
 From forall x_8: R_8(x_8) or S_8(x_8) we can infer R_8(a_8) or S_8(a_8). From S_8(a_8) <-> r we can infer S_8(a_8) -> r. Finally, from R_8(a_8) -> r, S_8(a_8) -> r, R_8(a_8) or S_8(a_8) we can infer r. Therefore, the answer is yes.