Consider the following premises. u or p. u -> r_10. q_10 -> r_10. p -> q_10. Can we infer r_10 or t from them?
 From p -> q_10, q_10 -> r_10 we can infer p -> r_10. From u -> r_10, p -> r_10, u or p we can infer r_10. Finally, from r_10 we can infer r_10 or t. Therefore, the answer is yes.