What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: P_2(z) or ~S(z). exists z: S(z) -> P_2(z). forall z: ~P_2(z). forall z: P_2(z) -> S(z).
exists z: ~S(z). forall z: S(z) -> P_2(z). exists z: S(z) <-> P_2(z). exists z: P_2(z) <-> S(z).