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His new production company became an autonomous production unit partner in the Triangle Film Corporation along with Thomas H. Ince and Keystone Studios ' Mack Sennett .
 Triangle Film Corporation, Thomas H. Ince, Keystone Studios, Mack Sennett
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Triangle Film Corporation, Thomas H. Ince, Keystone Studios, Mack Sennett