What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: T(z) -> U(z). forall z: T_2(z) <-> P(z). exists z: P(z) -> T(z).
exists z: P(z) -> U(z). forall z: T_2(z) -> P(z). forall z: P(z) -> T_2(z).