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Usually known as the Lady of the Fountain , she becomes the wife of the poem 's protagonist , Yvain , one of the knights of King Arthur 's Round Table , after he kills her husband , but later spurns the knight-errant when he neglects her for heroic adventure , only to take him back in the end .
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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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