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In page Aikido:

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Aikido practitioners (commonly called aikidōka outside Japan) generally progress by promotion through a series of "grades" (kyū), followed by a series of "degrees" (dan), pursuant to formal testing procedures. Some aikido organizations use belts to distinguish practitioners' grades, often simply white and black belts to distinguish kyu and dan grades, although some use various belt colors. Testing requirements vary, so a particular rank in one organization is not comparable or interchangeable with the rank of another.[1] Some dōjōs have an age requirement before students can take the dan rank exam.[citation needed]