Consider the following premises. t <-> q_9. ~q_9. w -> t. p_1 -> w. Can we infer p_1 from them?
 From t <-> q_9, ~q_9 we can infer ~t. From p_1 -> w, w -> t we can infer p_1 -> t. Finally, from p_1 -> t, ~t we can infer ~p_1, which contradicts p_1. Therefore, the answer is no.