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Walker is an unincorporated community located in Knox County , Kentucky , United States .
 location: Knox County; location: Kentucky; location: United States
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: Knox County, Kentucky, United States 
Answer:
 location: Knox County; location: Kentucky; location: United States