Consider the following premises. t_4. ~u_4. u_4 or q_15. Can we infer t_4 or q from them?
 From u_4 or q_15, ~u_4 we can infer q_15. From t_4, q_15 we can infer t_4 and q_15. From t_4 and q_15 we can infer t_4. Finally, from t_4 we can infer t_4 or q. Therefore, the answer is yes.