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Bulgarian air traffic controllers will go on strike on September 3 demanding higher pay , the chief of the Bulgarian association of air traffic controllers ( Bulatka ) said on Monday .
 Bulatka, Bulgarian, Bulgarian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Bulatka, Bulgarian, Bulgarian