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