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: u_2. u -> ~q_12. p_3 -> u. q_12.
~u can be inferred via the modus tollens rule. u_2 and q_12 can be inferred via the conjunction rule. q_12 and u_2 can be inferred via the conjunction rule.