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Greek Prime Minister Alexis Tsipras (R, front) gives presents to Greek students during an event to celebrate Christmas at Prime Minister's office in Athens, , on Dec. 23, 2017. (Xinhua/Marios Lolos)

Greek Prime Minister Alexis Tsipras (R, front) gives presents to Greek students during an event to celebrate Christmas at Prime Minister's office in Athens, , on Dec. 23, 2017. (Xinhua/Marios Lolos)