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: Q(x) -> R(x). forall x: R_1(x) -> Q(x). exists x: R_1(x) or ~R(x).
forall x: R_1(x) -> R(x) can be inferred via the universal transitivity rule. exists x: R(x) -> R_1(x) can be inferred via the existential rewriting rule.