Consider the following premises. q_9 or ~r_1. u <-> q_9. Can we infer r_1 -> u from them?
 From u <-> q_9 we can infer q_9 -> u. From q_9 or ~r_1 we can infer r_1 -> q_9. Finally, from r_1 -> q_9, q_9 -> u we can infer r_1 -> u. Therefore, the answer is yes.