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Duff died at the age of 79 at Cambridge .
 person: Duff; location: Cambridge
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: Duff, Cambridge 
Answer:
 person: Duff; location: Cambridge