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For example , if you know that the population of London is greater than the maximum number of hairs that can be present on a human 's head , then the pigeonhole principle requires that there must be at least two people in London who have the same number of hairs on their heads .
 location: London; location: London
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: London, London 
Answer:
 location: London; location: London