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According to the International Transport Workers ' Federation 2013 study , there were at least 30 operating merchant seaports in the Black Sea ( including at least 12 in Ukraine ) .
 International Transport Workers ' Federation, Black Sea, Ukraine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 International Transport Workers ' Federation, Black Sea, Ukraine