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This is a list of the National Register of Historic Places listings in Aitkin County , Minnesota .
 organization: Register; organization: Historic Places; location: Aitkin; location: Minnesota
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: Register, Historic Places, Aitkin, Minnesota 
Answer:
 organization: Register; organization: Historic Places; location: Aitkin; location: Minnesota