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: ~u_3. q_1 -> q. s -> q_1. q -> u_3.
~q can be inferred via the modus tollens rule. q_1 -> u_3 can be inferred via the transitivity rule. s -> q can be inferred via the transitivity rule.