Consider the following premises. u <-> q_9. p_1 or q_9. q_1 -> u. p_1 -> q_1. Can we infer u from them?
 From u <-> q_9 we can infer q_9 -> u. From p_1 -> q_1, q_1 -> u we can infer p_1 -> u. Finally, from p_1 -> u, q_9 -> u, p_1 or q_9 we can infer u. Therefore, the answer is yes.