Consider the following premises. q_11 <-> p_3. p_11 -> q_11. p_3 <-> s_3. ~s_3. q_11 -> p_11. Can we infer p_11 from them?
 From p_3 <-> s_3, ~s_3 we can infer ~p_3. From p_11 -> q_11, q_11 -> p_11 we can infer p_11 <-> q_11. From p_11 <-> q_11 we can infer p_11 -> q_11. From q_11 <-> p_3, ~p_3 we can infer ~q_11. Finally, from p_11 -> q_11, ~q_11 we can infer ~p_11, which contradicts p_11. Therefore, the answer is no.