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In 2003 he undertook a three-month-long paadayaatra , or walking tour , of 1475 " km during the very hot summer months , across several districts in Andhra Pradesh as a part of his election campaign .
 Andhra Pradesh
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Andhra Pradesh