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Numerous celebrities have ventured into becoming business moguls and established themselves as entrepreneurs , idolizing many well known American business leaders such as Bill Gates and Warren Buffett .
 Bill Gates, Warren Buffett
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bill Gates, Warren Buffett