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In Poland an international country music festival , known as Piknik Country , has been organized in Mrągowo in Masuria since 1983 .
 Poland, Mrągowo, Masuria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Poland, Mrągowo, Masuria