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_4. q or u. ~q. u_4 or q_13.
u can be inferred via the disjunctive syllogism rule. q_13 can be inferred via the disjunctive syllogism rule. ~u_4 and ~q can be inferred via the conjunction rule. ~q and ~u_4 can be inferred via the conjunction rule.