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