What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_4: P_3(z_4) <-> S(z_4). forall z_4: P_3(z_4) <-> S(z_4).
forall z_4: P_3(z_4) -> S(z_4). forall z_4: P_3(z_4) -> S(z_4). forall z_4: S(z_4) -> P_3(z_4). forall z_4: S(z_4) -> P_3(z_4).