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By contrast , the federal prison population increased significantly under presidents Ronald Reagan , George H. W. Bush , Bill Clinton , and George W. Bush .
 Ronald Reagan, George H. W. Bush, Bill Clinton, George W. Bush
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ronald Reagan, George H. W. Bush, Bill Clinton, George W. Bush