What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: P(z) -> T(z). exists z: T(z) <-> W_1(z). forall z: ~W_1(z).
exists z: T(z) -> W_1(z). exists z: W_1(z) -> T(z). exists z: ~T(z).