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George Labram was an American engineer employed as Chief Mechanical Engineer at the De Beers diamond mines in Kimberley during the Siege of Kimberley .
 Labram, De Beers, Kimberley, Kimberley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Labram, De Beers, Kimberley, Kimberley