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. p_9 or ~q. p -> p_9. p_9 -> q.
~p_9 can be inferred via the modus tollens rule. p -> q can be inferred via the transitivity rule. q -> p_9 can be inferred via the rewriting rule.