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. u. p_13 -> q_13.
~p_13 can be inferred via the modus tollens rule. ~q_13 and u can be inferred via the conjunction rule. u and ~q_13 can be inferred via the conjunction rule.