What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: S_4(z) <-> P_4(z). forall z: T(z) -> P_4(z). forall z: S_4(z) -> T(z).
forall z: S_4(z) -> P_4(z). forall z: S_4(z) -> P_4(z). forall z: P_4(z) -> S_4(z).