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) -> ~W_2(z). exists z: U(z) or ~P_3(z). forall z: W_2(z).
forall z: ~U(z) can be inferred via the universal modus tollens rule. exists z: P_3(z) -> U(z) can be inferred via the existential rewriting rule.