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_2. ~q_3 -> p. u. q_3 -> ~u.
~q_3 can be inferred via the modus tollens rule. t_2 and u can be inferred via the conjunction rule. u and t_2 can be inferred via the conjunction rule.