What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_4: Q(z_4) -> S_4(z_4). exists z_4: S_4(z_4) <-> Q(z_4).
exists z_4: S_4(z_4) -> Q(z_4). exists z_4: Q(z_4) -> S_4(z_4).