What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: S_2(z) <-> P(z). forall z: S_2(z) <-> W_2(z). forall z: ~P(z).
forall z: S_2(z) -> P(z). forall z: S_2(z) -> W_2(z). forall z: P(z) -> S_2(z). forall z: W_2(z) -> S_2(z). forall z: ~S_2(z).