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