Consider the following premises. t -> q_11. q_11 -> t. t -> ~p. p. Can we infer q_11 from them?
 From t -> q_11, q_11 -> t we can infer t <-> q_11. From t <-> q_11 we can infer q_11 -> t. From t -> ~p, p we can infer ~t. Finally, from q_11 -> t, ~t we can infer ~q_11, which contradicts q_11. Therefore, the answer is no.