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what are some really popular history movies that came out in the past eight decades that are rated pg
 really popular, history, past eight decades, pg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: genre, year, plot, average ratings, actor, title, song, character, rating, review, director, trailer 
Text: {0} 
Answer:
 really popular, history, past eight decades, pg