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The Regierender Bürgermeister (English: Governing Mayor) of Berlin is the head of government of the city. The Governing Mayor is the equivalent of the Minister President of the bigger States of Germany.
The Regierender Bürgermeister is elected by the Abgeordentenhaus (English: House of Representatives). He then appoints up to eight Senators. The Senators are ministers in charge of the departments of the city government. Two of the senators are also Mayors. The Mayors are the deputies of the Governing Mayor.