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Since 1618 , the Margraviate of Brandenburg had been in personal union with the Duchy of Prussia .
 location: Margraviate of Brandenburg; location: Duchy of Prussia
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Margraviate of Brandenburg, Duchy of Prussia 
Answer:
 location: Margraviate of Brandenburg; location: Duchy of Prussia