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 -> q_2. q. ~t. q_2 -> t.
~q_2 can be inferred via the modus tollens rule. u -> t can be inferred via the transitivity rule. q and ~t can be inferred via the conjunction rule. ~t and q can be inferred via the conjunction rule.