What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: P_4(z). forall z: Q_1(z) -> P(z). forall z: P_4(z) -> P(z). forall z: U(z).
forall z: P(z). forall z: P_4(z) and U(z). forall z: U(z) and P_4(z).