In this Tuesday, March 20, 2018 file photo, officials carry papers relating to Article 50 as they arrive for a meeting of at the Europa building in Brussels. The European Union's highest court is hearing arguments Tuesday, Nov. 27, 2018 on whether Britain could unilaterally revoke its decision to leave the EU ahead of its planned exit date of March 29, 2019. (AP Photo/Virginia Mayo, File)
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