What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: U(z) <-> P_3(z). forall z: U(z) -> S_3(z). exists z: P_3(z) <-> S_3(z).
forall z: U(z) -> P_3(z). exists z: P_3(z) -> S_3(z). forall z: P_3(z) -> U(z). exists z: S_3(z) -> P_3(z).