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: r -> q_6. q_6 -> r_6. r or ~q_12. r_6 -> q_12.
r -> r_6 can be inferred via the transitivity rule. q_6 -> q_12 can be inferred via the transitivity rule. q_12 -> r can be inferred via the rewriting rule.