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_3 -> q. q -> u. u -> s. s -> q_3.
q_3 -> u can be inferred via the transitivity rule. q -> s can be inferred via the transitivity rule. u -> q_3 can be inferred via the transitivity rule. s -> q can be inferred via the transitivity rule.