Consider the following premises. p_11 -> q_11. ~q_11. q_4 -> p_11. Can we infer ~q_4 or t from them?
 From p_11 -> q_11, ~q_11 we can infer ~p_11. From q_4 -> p_11, ~p_11 we can infer ~q_4. Finally, from ~q_4 we can infer ~q_4 or t. Therefore, the answer is yes.