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The film was adapted by Leonardo Bercovici and Robert E. Sherwood from the 1928 novel of the same name by Robert Nathan .
 Leonardo Bercovici, Robert E. Sherwood, Robert Nathan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leonardo Bercovici, Robert E. Sherwood, Robert Nathan