What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists z: ~P_1(z). forall z: P_1(z) <-> T(z). forall z: T(z) -> P_1(z).
exists z: ~T(z). forall z: P_1(z) -> T(z). forall z: T(z) -> P_1(z). exists z: ~T(z).