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Princess Lieu Hanh ( Vietnamese : Liễu Hạnh Công chúa , chữ Hán : 柳杏公主 ) is one of The Four Immortals and also a leading figure in the mother goddess cult Đạo Mẫu , in which she governs the celestial realm .
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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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