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) -> S(z). exists z: T_2(z) <-> W(z). forall z: P_4(z) -> T_2(z).
exists z: T_2(z) -> W(z). exists z: W(z) -> T_2(z).