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The Upanishadic texts reiterate the existence of a purusha ( being ) of the size of the thumb ( angustha matram ) enshrined in the interiors of the heart ( hridaye guhaayaam - Cave of the Heart ) of a human being .
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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:
 None