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). forall z: S_4(z) -> P(z). forall z: P(z) -> U(z). exists z: U(z) -> S_4(z).
forall z: ~S_4(z). forall z: S_4(z) -> U(z). exists z: U(z) -> P(z). exists z: P(z) -> S_4(z).