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: T(z) -> R_4(z). exists z: T(z) or ~R_4(z). forall z: ~T(z).
exists z: R_4(z) -> T(z) can be inferred via the existential rewriting rule.