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A Taanka is a cylindrical underground rainwater storage cistern usually 10 ’ x 10 ’ in size , wherein rainwater from rooftops , a courtyard or natural or artificially prepared catchment flows into the paved underground pit , through filtered inlets made on the external wall of the structure , where it is stored and can be used by one family during the dry season .
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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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