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_8 -> q. r_1 -> r. r -> q_8. q -> r_1.
q_8 -> r_1 can be inferred via the transitivity rule. r_1 -> q_8 can be inferred via the transitivity rule. r -> q can be inferred via the transitivity rule. q -> r can be inferred via the transitivity rule.