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 -> u_2. p -> r_8. r_8 -> q. u_2 -> r_8.
q -> r_8 can be inferred via the transitivity rule. p -> q can be inferred via the transitivity rule. r_8 -> u_2 can be inferred via the transitivity rule. u_2 -> q can be inferred via the transitivity rule.