Consider the following premises. q_1 <-> u. q <-> q_17. u or ~q_17. s_1. q_1 -> ~s_1. Can we infer q from them?
 From u or ~q_17 we can infer q_17 -> u. From q_1 -> ~s_1, s_1 we can infer ~q_1. From q_1 <-> u, ~q_1 we can infer ~u. From q_17 -> u, ~u we can infer ~q_17. Finally, from q <-> q_17, ~q_17 we can infer ~q, which contradicts q. Therefore, the answer is no.