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Polish President Andrzej Duda (L) shakes hands with visiting Hungarian Prime Minister Viktor Orban in Warsaw, capital of Poland, on May 14, 2018. (Xinhua/Jaap Arriens)

Polish President Andrzej Duda (L) shakes hands with visiting Hungarian Prime Minister Viktor Orban in Warsaw, capital of Poland, on May 14, 2018. (Xinhua/Jaap Arriens)