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Together with Charlie Chaplin , Mary Pickford and Douglas Fairbanks he founded United Artists , enabling them to control their own interests , rather than depending on commercial studios .
 Charlie Chaplin, Mary Pickford, Douglas Fairbanks, United Artists
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Charlie Chaplin, Mary Pickford, Douglas Fairbanks, United Artists