Consider the following premises. q_3 -> q. s_1 <-> q_2. s_1 -> q_3. Can we infer q_2 -> q from them?
 From s_1 <-> q_2 we can infer q_2 -> s_1. From q_2 -> s_1, s_1 -> q_3 we can infer q_2 -> q_3. Finally, from q_2 -> q_3, q_3 -> q we can infer q_2 -> q. Therefore, the answer is yes.