Consider the following premises. forall x_9: P_2(x_9) or R_4(x_9). forall x_9: P_9(x_9) <-> Q_9(x_9). forall x_9: R_4(x_9) -> Q_3(x_9). forall x_9: ~P_2(x_9) or P_9(x_9). forall x_9: Q_3(x_9) -> Q_9(x_9). Can we infer forall x_9: Q_9(x_9) from them?
 From forall x_9: P_9(x_9) <-> Q_9(x_9) we can infer forall x_9: P_9(x_9) -> Q_9(x_9). From forall x_9: R_4(x_9) -> Q_3(x_9), forall x_9: Q_3(x_9) -> Q_9(x_9) we can infer forall x_9: R_4(x_9) -> Q_9(x_9). From forall x_9: P_2(x_9) or R_4(x_9), forall x_9: ~P_2(x_9) or P_9(x_9) we can infer forall x_9: R_4(x_9) or P_9(x_9). Finally, from forall x_9: R_4(x_9) -> Q_9(x_9), forall x_9: P_9(x_9) -> Q_9(x_9), forall x_9: R_4(x_9) or P_9(x_9) we can infer forall x_9: Q_9(x_9). Therefore, the answer is yes.