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 or s. ~p_13. ~p. p_13 or u_3.
s can be inferred via the disjunctive syllogism rule. u_3 can be inferred via the disjunctive syllogism rule. ~p_13 and ~p can be inferred via the conjunction rule. ~p and ~p_13 can be inferred via the conjunction rule.