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_13 -> r_3. r_3 -> r_1. p_13 -> q_13. q_13 -> r_13. r_1 -> p_13.
r_13 -> r_1 can be inferred via the transitivity rule. r_3 -> p_13 can be inferred via the transitivity rule. p_13 -> r_13 can be inferred via the transitivity rule. q_13 -> r_3 can be inferred via the transitivity rule. r_1 -> q_13 can be inferred via the transitivity rule.