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The exercise dưỡng sinh or Dưỡng Sinh ( compare Chinese Yang-Sheng 養生 ) is a form of partly indigenous breathing and yoga exercise similar to Tai Chi popularized in Vietnam by the historian and political activist Nguyễn Khắc Viện .
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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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