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Directed by William S. Hart and produced by Thomas H. Ince , the screenplay was written by C. Gardner Sullivan .
 William S. Hart, Thomas H. Ince, C. Gardner Sullivan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William S. Hart, Thomas H. Ince, C. Gardner Sullivan