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 x: S_3(x) or ~S_2(x). exists x: S_2(x) or ~S_3(x).
forall x: S_2(x) -> S_3(x) can be inferred via the universal rewriting rule. exists x: S_3(x) -> S_2(x) can be inferred via the existential rewriting rule.