Consider the following premises. t_3 <-> q_3. q_3 <-> t_3. Can we infer q_3 -> t_3 from them?
 From t_3 <-> q_3 we can infer t_3 -> q_3. Finally, from q_3 <-> t_3 we can infer q_3 -> t_3. Therefore, the answer is yes.