What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall z: U(z). forall z: Q(z) -> R(z). forall z: Q_4(z) -> Q(z). exists z: R(z) or ~U(z).
forall z: Q_4(z) -> R(z) can be inferred via the universal transitivity rule. exists z: U(z) -> R(z) can be inferred via the existential rewriting rule.