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Roger Ebert gave it only half a star out of a possible four stars , saying that it is " as close as you can get to absolute nothing and still have a product to project on the screen , " comparing it to synthetic foods in brightly marketed packaging with no nutritional content .
 Roger Ebert
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:
 Roger Ebert