Consider the following premises. forall x_9: T(x_9) -> P_9(x_9). exists x_9: P_9(x_9) <-> Q_9(x_9). forall x_9: Q(x_9) -> Q_9(x_9). forall x_9: T(x_9) or Q(x_9). Can we infer exists x_9: Q_9(x_9) from them?
 From exists x_9: P_9(x_9) <-> Q_9(x_9) we can infer exists x_9: P_9(x_9) -> Q_9(x_9). From forall x_9: T(x_9) -> P_9(x_9), exists x_9: P_9(x_9) -> Q_9(x_9) we can infer exists x_9: T(x_9) -> Q_9(x_9). Finally, from exists x_9: T(x_9) -> Q_9(x_9), forall x_9: Q(x_9) -> Q_9(x_9), forall x_9: T(x_9) or Q(x_9) we can infer exists x_9: Q_9(x_9). Therefore, the answer is yes.