Consider the following premises. r -> q_3. q_3 <-> t. r -> ~s. s and w_3. q_3 -> r. Can we infer t from them?
 From s and w_3 we can infer s. From q_3 -> r, r -> q_3 we can infer q_3 <-> r. From r -> ~s, s we can infer ~r. From q_3 <-> r, ~r we can infer ~q_3. Finally, from q_3 <-> t, ~q_3 we can infer ~t, which contradicts t. Therefore, the answer is no.