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Many have become popular classics including The Mouse in the Matzah Factory , Once Upon a Shabbos , the Sammy Spider series , The Secret of Priest 's Grotto , and the best-selling book Six Million Paper Clips .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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