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_6: Q_6(x_6) -> S(x_6). forall x_6: P_4(x_6) -> Q_6(x_6). ~S(a_5).
forall x_6: P_4(x_6) -> S(x_6) can be inferred via the universal transitivity rule.