What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists z: P_1(z) or ~Q(z). forall z: P_1(z) <-> U_3(z).
exists z: Q(z) -> P_1(z). forall z: P_1(z) -> U_3(z). forall z: U_3(z) -> P_1(z).