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 or p_6. p -> r_6. p_6 -> p. r_6 or ~q_2.
p_6 -> r_6 can be inferred via the transitivity rule. q_2 -> r_6 can be inferred via the rewriting rule.