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_13 or t. q_19. r_2. ~p_13.
t can be inferred via the disjunctive syllogism rule. q_19 and r_2 can be inferred via the conjunction rule. q_19 and ~p_13 can be inferred via the conjunction rule. r_2 and q_19 can be inferred via the conjunction rule. r_2 and ~p_13 can be inferred via the conjunction rule. ~p_13 and q_19 can be inferred via the conjunction rule. ~p_13 and r_2 can be inferred via the conjunction rule.