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_6 -> u. q_1 -> q_6. s_3 -> q_1. u -> s_3.
q_6 -> s_3 can be inferred via the transitivity rule. q_1 -> u can be inferred via the transitivity rule. s_3 -> q_6 can be inferred via the transitivity rule. u -> q_1 can be inferred via the transitivity rule.