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