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