Consider the following premises. q_9 -> p_9. ~p_9. p_9 -> q_9. q_9. Can we infer q_6 from them?
 From p_9 -> q_9, q_9 -> p_9 we can infer p_9 <-> q_9. From q_9 we can infer q_9 or q_6. From p_9 <-> q_9, ~p_9 we can infer ~q_9. Finally, from q_9 or q_6, ~q_9 we can infer q_6. Therefore, the answer is yes. Notice, however, that the premises were contradictory, so we can infer anything from them.