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 y: R_2(y) or ~R(y). exists y: S(y) or ~P_4(y). forall y: S(y) -> R(y).
forall y: R(y) -> R_2(y) can be inferred via the universal rewriting rule. exists y: P_4(y) -> S(y) can be inferred via the existential rewriting rule.