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Vincent Kiprop Chepkok ( born 5 July 1988 ) is a Kenya n long-distance runner who specializes in the 5000 metres .
 Vincent, Chepkok, Kenya
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vincent, Chepkok, Kenya