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Greek Prime Minister Alexis Tsipras (R) welcomes Slovenian President Borut Pahor at the Prime Minister's office in Athens, Greece, Dec. 4, 2018. (Xinhua/Marios Lolos)

Greek Prime Minister Alexis Tsipras (R) welcomes Slovenian President Borut Pahor at the Prime Minister's office in Athens, Greece, Dec. 4, 2018. (Xinhua/Marios Lolos)