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On these lines , one of the principal Upanishad s , the Katha Upanishad in 2nd Valli 1.12-13 shruti lays down , " The self ( purusha ) , who is of the size of a thumb ( angustha ) , resides in the body .
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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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