What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~U(d_3). forall z: T(z) -> U(z). forall z: U(z) -> T(z). ~T(d_3) -> w_4.
forall z: T(z) <-> U(z). forall z: U(z) <-> T(z).