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Nothing in this Convention shall be interpreted as imposing an obligation to extradite or to afford mutual legal assistance, if the requested State Party has substantial grounds for believing that the request for extradition for offences set forth in article 3, 3bis, 3ter or 3quater or for mutual legal assistance with respect to such offences has been made for the purpose of prosecuting or punishing a person on account of that person’s race, religion, nationality, ethnic origin, political opinion or gender, or that compliance with the request would cause prejudice to that person’s position for any of these reasons.