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In page Metropolitan area:
"The German government defines eleven metro areas that are the most densely populated areas in the Federal Republic of Germany. They comprise the major German cities and their surrounding catchment areas and form the political, commercial and cultural centers of the country. For urban centers outside metropolitan areas, that generate a similar attraction at smaller scale for their region, the concept of the Regiopolis and respectively regiopolitan area or region was introduced by German professors in 2006.[citation needed]
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