Consider the following premises. forall x_9: P_9(x_9) <-> U(x_9). forall x_9: P_6(x_9) -> U(x_9). forall x_9: P_6(x_9) or P_9(x_9). exists x_9: U_2(x_9). Can we infer exists x_9: U(x_9) from them?
 From forall x_9: P_9(x_9) <-> U(x_9) we can infer forall x_9: P_9(x_9) -> U(x_9). From forall x_9: P_6(x_9) -> U(x_9), forall x_9: P_9(x_9) -> U(x_9), forall x_9: P_6(x_9) or P_9(x_9) we can infer forall x_9: U(x_9). From forall x_9: U(x_9), exists x_9: U_2(x_9) we can infer exists x_9: U(x_9) and U_2(x_9). Finally, from exists x_9: U(x_9) and U_2(x_9) we can infer exists x_9: U(x_9). Therefore, the answer is yes.