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In 1952 , he graduated from Rock Springs High School and then studied accounting at the University of Wyoming , where he was a member of Kappa Sigma social fraternity .
 Rock Springs, Wyoming, Kappa Sigma
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rock Springs, Wyoming, Kappa Sigma