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: ~t. p_2 -> t. u. p_12 -> ~u.
~p_2 can be inferred via the modus tollens rule. ~p_12 can be inferred via the modus tollens rule. ~t and u can be inferred via the conjunction rule. u and ~t can be inferred via the conjunction rule.