Consider the following premises. p_6 -> t. p_6 or u_2. u_2 <-> t. w. Can we infer w and t from them?
 From u_2 <-> t we can infer u_2 -> t. From p_6 -> t, u_2 -> t, p_6 or u_2 we can infer t. Finally, from w, t we can infer w and t. Therefore, the answer is yes.