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: p_2 or q_3. q_3 -> q_4. q_4 or ~u_3. ~p_2 or u_3.
q_3 or u_3 can be inferred via the resolution rule. u_3 -> q_4 can be inferred via the rewriting rule.