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Bacho Kiro established a number of cultural centres ( chitalishta ) ; in February 1872 , he became the Byala Cherkva head of Vasil Levski 's Internal Revolutionary Organisation .
 Bacho Kiro, Byala Cherkva, Vasil Levski, Internal Revolutionary Organisation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bacho Kiro, Byala Cherkva, Vasil Levski, Internal Revolutionary Organisation