What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~T(a_2). forall z_4: T(z_4) <-> U_1(z_4).
forall z_4: T(z_4) -> U_1(z_4). forall z_4: U_1(z_4) -> T(z_4).