Original: The Union 's name is formed from the beginning of each country 's name ; it was possibly created for the Benelux Customs Union , Revue de l'Institut International de Statistique (/O1947/O) Vol .
Simplified: This parliamentary assembly is composed of 21 members of the Dutch parliament , 21 members of the Belgian national and regional parliaments , and 7 members of the Luxembourgish parliament .