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who played both boys in the errol flynn movie the prince and the pauper
 actor: errol flynn; title: the prince and the pauper
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: genre, year, plot, average ratings, actor, title, song, character, rating, review, director, trailer 
Text: {0} 
Answer:
 actor: errol flynn; title: the prince and the pauper