What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: T_1(z) or W(z). forall z: T_1(z) -> U_3(z). exists z: ~U_3(z). forall z: U_3(z) -> T_1(z).
exists z: ~T_1(z). forall z: T_1(z) <-> U_3(z). forall z: U_3(z) <-> T_1(z).