Consider the following premises. u_4 -> u. u or ~q_11. q_11 or u_4. Can we infer u or q from them?
 From u or ~q_11 we can infer q_11 -> u. From q_11 -> u, u_4 -> u, q_11 or u_4 we can infer u. Finally, from u we can infer u or q. Therefore, the answer is yes.