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Military career After a brief initial posting , Pitman joined the 27th Punjabi Regiment with which he stayed from 1910 to 1921 when he retired from the army to take up farming in Kenya .
 Military, Pitman, 27th Punjabi Regiment, Kenya
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Military, Pitman, 27th Punjabi Regiment, Kenya