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When Jang Geum returns to the palace , Yeon-saeng becomes pregnant and becomes Lee Sook-won ( Royal Concubine Lee ) ( 이숙원 ( 李淑媛 ) .
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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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