Consider the following premises. forall x_5: U_1(x_5). forall x_5: U_1(x_5) <-> Q(x_5). forall x_5: S_4(x_5) -> Q(x_5). Can we infer forall x_5: Q(x_5) from them?
 From forall x_5: U_1(x_5) we can infer forall x_5: U_1(x_5) or S_4(x_5). From forall x_5: U_1(x_5) <-> Q(x_5) we can infer forall x_5: U_1(x_5) -> Q(x_5). Finally, from forall x_5: U_1(x_5) -> Q(x_5), forall x_5: S_4(x_5) -> Q(x_5), forall x_5: U_1(x_5) or S_4(x_5) we can infer forall x_5: Q(x_5). Therefore, the answer is yes.