13122
This silent film was produced by Mack Sennett and The Keystone Film Company and distributed by Mutual Film Corporation .
 Mack Sennett, The Keystone Film Company, Mutual Film Corporation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Mack Sennett, The Keystone Film Company, Mutual Film Corporation