Consider the following premises. forall x_13: R(x_13) or S_13(x_13). R(d) <-> r. S_13(d) <-> r. Can we infer r from them?
 From forall x_13: R(x_13) or S_13(x_13) we can infer R(d) or S_13(d). From R(d) <-> r we can infer R(d) -> r. From S_13(d) <-> r we can infer S_13(d) -> r. Finally, from R(d) -> r, S_13(d) -> r, R(d) or S_13(d) we can infer r. Therefore, the answer is yes.