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 or ~r_3. ~r. p and s.
~r_3 can be inferred via the disjunctive syllogism rule. p can be inferred via the simplification rule. s can be inferred via the simplification rule. r_3 -> r can be inferred via the rewriting rule.