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: r. ~u_2. u_2 or ~S_24(a_24). forall x_24: R_24(x_24) -> S_24(x_24).
~S_24(a_24) can be inferred via the disjunctive syllogism rule. r and ~u_2 can be inferred via the conjunction rule. ~u_2 and r can be inferred via the conjunction rule. S_24(a_24) -> u_2 can be inferred via the rewriting rule.