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: S(z). forall z: S(z) or ~W_1(z). forall z: S(z) -> W_1(z).
exists z: W_1(z) can be inferred via the existential modus ponens rule. forall z: W_1(z) -> S(z) can be inferred via the universal rewriting rule.