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Author Robert J. Sawyer blogged that the movie was " the most thoughtful and compelling science fiction film of 2009 " ( a quote subsequently used in press materials ) .
 Robert J. Sawyer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert J. Sawyer