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According to Bob Woodward and Carl Bernstein 's book " The Final Days " , it was also Richard Nixon 's favorite film .
 Bob Woodward, Carl Bernstein, Richard Nixon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bob Woodward, Carl Bernstein, Richard Nixon