What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: P_4(z) -> U(z). exists z: U(z) -> P_4(z). forall z: ~T(z). forall z: P_4(z) -> T(z).
forall z: ~P_4(z). exists z: U(z) -> T(z). exists z: U(z) <-> P_4(z). exists z: P_4(z) <-> U(z).