Consider the following premises. w <-> t. t_3. t -> ~t_3. Can we infer w from them? If possible, name the inference rules being used at each step.
 From t -> ~t_3, t_3 we can infer ~t via modus tollens. Finally, from w <-> t, ~t we can infer ~w via biconditional elimination, which contradicts w. Therefore, the answer is no.