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Eurosong 2010 Slovakia was the first country to announce its participation in the Eurovision Song Contest 2010 , which was announced by STV on 28 March 2009 , six weeks before the 2009 Contest .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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