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. p_15 -> q_15. s -> u_3. p_15. u_3 -> q.
q_15 can be inferred via the modus ponens rule. ~u_3 can be inferred via the modus tollens rule. s -> q can be inferred via the transitivity rule. ~q and p_15 can be inferred via the conjunction rule. p_15 and ~q can be inferred via the conjunction rule.