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_2 -> t_3. p -> q. q -> s_2. ~t_3. s_2 -> q_2.
~q_2 can be inferred via the modus tollens rule. p -> s_2 can be inferred via the transitivity rule. q -> q_2 can be inferred via the transitivity rule. s_2 -> t_3 can be inferred via the transitivity rule.