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While at Annapolis , he conducted his first experiments on the speed of light , as part of a class demonstration in 1877 .
 location: Annapolis
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: Annapolis 
Answer:
 location: Annapolis