What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: ~P_2(x_9). forall x_9: P_2(x_9) or U_2(x_9). exists x_9: R_3(x_9) <-> U_2(x_9). forall x_9: Q(x_9) -> R_3(x_9).
forall x_9: U_2(x_9). exists x_9: R_3(x_9) -> U_2(x_9). exists x_9: U_2(x_9) -> R_3(x_9).