Consider the following premises. ~r. t <-> r. w_1. t <-> q_7. Can we infer w_1 and ~q_7 from them?
 From t <-> r, ~r we can infer ~t. From t <-> q_7, ~t we can infer ~q_7. Finally, from w_1, ~q_7 we can infer w_1 and ~q_7. Therefore, the answer is yes.