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 y: R_4(y) or ~Q_4(y). forall y: Q_4(y) or ~R_4(y).
forall y: R_4(y) -> Q_4(y) can be inferred via the universal rewriting rule. exists y: Q_4(y) -> R_4(y) can be inferred via the existential rewriting rule.