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Now a days various conducting polymers such as Polyaniline ( PANI ) , Polypyrrole ( PPy ) , Polyindole , Polythiophenes etc. ( See Conductive polymer ) are most studied and various methods are reported such as hard template methods , soft template methods are used for the synthesis of various nanostructures .
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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 
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