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: p -> q_9. q or ~r_2. q_9 -> q. p.
q_9 can be inferred via the modus ponens rule. p -> q can be inferred via the transitivity rule. r_2 -> q can be inferred via the rewriting rule.