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On one day , the goat gathers all three around , telling them that she must leave on a quest for food , instructing them not to open the door unless they hear her singing , in characteristically soft voice , the refrain : The conversation is overheard by the wolf , who spies on the goat 's family .
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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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