Consider the following premises. forall x_9: P_9(x_9) or Q_9(x_9). forall x_9: ~P_5(x_9). forall x_9: ~P_9(x_9). forall x_9: P_5(x_9) or S(x_9). Can we infer Q_9(a_2) from them?
 From forall x_9: P_9(x_9) or Q_9(x_9), forall x_9: ~P_9(x_9) we can infer forall x_9: Q_9(x_9). From forall x_9: P_5(x_9) or S(x_9), forall x_9: ~P_5(x_9) we can infer forall x_9: S(x_9). From forall x_9: S(x_9), forall x_9: Q_9(x_9) we can infer forall x_9: S(x_9) and Q_9(x_9). From forall x_9: S(x_9) and Q_9(x_9) we can infer S(a_2) and Q_9(a_2). Finally, from S(a_2) and Q_9(a_2) we can infer Q_9(a_2). Therefore, the answer is yes.