Consider the following premises. exists x_9: P_5(x_9) <-> U(x_9). forall x_9: W(x_9) -> P_5(x_9). forall x_9: ~P_9(x_9). forall x_9: P_9(x_9) or U(x_9). Can we infer forall x_9: ~P_5(x_9) from them?
 From forall x_9: P_9(x_9) or U(x_9), forall x_9: ~P_9(x_9) we can infer forall x_9: U(x_9). From forall x_9: U(x_9) we can infer forall x_9: U(x_9) or W(x_9). From exists x_9: P_5(x_9) <-> U(x_9) we can infer exists x_9: U(x_9) -> P_5(x_9). Finally, from exists x_9: U(x_9) -> P_5(x_9), forall x_9: W(x_9) -> P_5(x_9), forall x_9: U(x_9) or W(x_9) we can infer exists x_9: P_5(x_9), which contradicts forall x_9: ~P_5(x_9). Therefore, the answer is no.