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The Mildenhall photographic collection contains more than 7,700 photographic images on glass negatives of Canberra in the 1920s and 1930s .
 person: Mildenhall; location: Canberra
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: Mildenhall, Canberra 
Answer:
 person: Mildenhall; location: Canberra