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: u or q_4. q_3. ~u.
q_4 can be inferred via the disjunctive syllogism rule. q_3 and ~u can be inferred via the conjunction rule. ~u and q_3 can be inferred via the conjunction rule.