Consider the following premises. u_3 -> q_9. p_9 <-> q_9. ~q_5 or u_3. ~q or p_9. q or q_5. Can we infer q_9 from them? If possible, name the inference rules being used at each step.
 From p_9 <-> q_9 we can infer p_9 -> q_9 via biconditional elimination. From q or q_5, ~q or p_9 we can infer q_5 or p_9 via resolution. From q_5 or p_9, ~q_5 or u_3 we can infer p_9 or u_3 via resolution. Finally, from p_9 -> q_9, u_3 -> q_9, p_9 or u_3 we can infer q_9 via disjunction elimination. Therefore, the answer is yes.