Consider the following premises. exists x_3: W_4(x_3) -> ~Q_3(x_3). forall x_3: Q_3(x_3). forall x_3: W_4(x_3) or Q(x_3). Can we infer exists x_3: Q(x_3) from them?
 From exists x_3: W_4(x_3) -> ~Q_3(x_3), forall x_3: Q_3(x_3) we can infer exists x_3: ~W_4(x_3). Finally, from forall x_3: W_4(x_3) or Q(x_3), exists x_3: ~W_4(x_3) we can infer exists x_3: Q(x_3). Therefore, the answer is yes.