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: s_2 -> u_3. ~u. u or s_2. q.
s_2 can be inferred via the disjunctive syllogism rule. ~u and q can be inferred via the conjunction rule. q and ~u can be inferred via the conjunction rule.