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 x_7: U_2(x_7) or ~S(x_7). forall x_7: U_2(x_7) -> Q_1(x_7). forall x_7: Q_1(x_7) -> S(x_7).
forall x_7: U_2(x_7) -> S(x_7) can be inferred via the universal transitivity rule. exists x_7: S(x_7) -> U_2(x_7) can be inferred via the existential rewriting rule.