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: q_13 -> s. ~u. u or q_13. p.
q_13 can be inferred via the disjunctive syllogism rule. ~u and p can be inferred via the conjunction rule. p and ~u can be inferred via the conjunction rule.