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A referendum was held in the landlocked microstate on 20 October 2013 in which the citizens were asked whether the country should submit an application to join the European Union .
 European Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 European Union