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Greek Prime Minister Alexis Tsipras (1st R) attends an event to celebrate Christmas with Greek students at Prime Minister's office in Athens, Greece, on Dec. 23, 2017. (Xinhua/Marios Lolos)
Greek Prime Minister Alexis Tsipras (1st R) attends an event to celebrate Christmas with Greek students at Prime Minister's office in Athens, Greece, on Dec. 23, 2017. (Xinhua/Marios Lolos)