What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: U_4(z) or U(z). forall z: U(z) -> T_1(z). forall z: T_1(z) -> Q_3(z). exists z: Q_3(z) or ~U_4(z).
forall z: U(z) -> Q_3(z). exists z: U_4(z) -> Q_3(z).