Consider the following premises. p -> p_8. p_8 -> q_8. q_8 -> r_1. r_1 -> p. Can we infer r_1 -> p_8 from them?
 From p_8 -> q_8, q_8 -> r_1 we can infer p_8 -> r_1. Finally, from r_1 -> p, p -> p_8 we can infer r_1 -> p_8. Therefore, the answer is yes.