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 -> t_1. ~p_3. q_4 -> p_3. ~t_1.
~q can be inferred via the modus tollens rule. ~q_4 can be inferred via the modus tollens rule. ~p_3 and ~t_1 can be inferred via the conjunction rule. ~t_1 and ~p_3 can be inferred via the conjunction rule.