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Artists perform in Hungarian composer Emmerich Kalmansdrama's operetta "The Gipsy Princess" at a theatre in Bydgoszcz, Poland on Dec. 17, 2017. (Xinhua/Jaap Arriens)
Artists perform in Hungarian composer Emmerich Kalmansdrama's operetta "The Gipsy Princess" at a theatre in Bydgoszcz, Poland on Dec. 17, 2017. (Xinhua/Jaap Arriens)