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In page Senate (Belgium):

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Ten senators are co-opted, meaning they are elected by their peers: six by the Dutch-language group and four by the French-language group. These seats are distributed proportionally between parties based on the results of the direct election of the Chamber of Representatives. In 1893, the co-opted members were included in the Constitution as a new category of senators. It was intended to allow the senators to elect a number of experts or members of representative organizations to join them to enhance the quality of debate and legislation; however, political parties sometimes use it as a means of rewarding loyal members that were not elected.