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Greek Prime Minister Alexis Tsipras (L) briefs Greek President Prokopis Pavlopoulos, in Athens, Greece, on May 19, 2018. (Xinhua/Marios Lolos)

Greek Prime Minister Alexis Tsipras (L) briefs Greek President Prokopis Pavlopoulos, in Athens, Greece, on May 19, 2018. (Xinhua/Marios Lolos)