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