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The Cultural Revolution began in 1980 , with an initial closure of universities for three years , in order to perform an inspection and clean up in the cultural policy of the education and training system .
 Cultural Revolution
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:
 Cultural Revolution