Consider the following premises. forall x_9: P_9(x_9) and Q_9(x_9). forall x_5: P_9(x_5) -> S_5(x_5). Can we infer S_5(a_6) from them?
 From forall x_9: P_9(x_9) and Q_9(x_9) we can infer forall x_9: P_9(x_9). From forall x_9: P_9(x_9) we can infer P_9(a_6). From forall x_5: P_9(x_5) -> S_5(x_5) we can infer P_9(a_6) -> S_5(a_6). Finally, from P_9(a_6) -> S_5(a_6), P_9(a_6) we can infer S_5(a_6). Therefore, the answer is yes.