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He freezes in terror , then reveals his former shape-shifting secret to his wife who is certain his story can not be true ; he warns her that if the inscription on the ring ( " In canis corpore transmuto " ) is spoken aloud he will turn into a shaggy dog .
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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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