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A Turkish child holds national flags in front of Ataturk Mausoleum to celebrate the 99th National Sovereignty and Children's Day in Ankara, Turkey, April 23, 2019. (Xinhua/Qin Yanyang)

A Turkish child holds national flags in front of Ataturk Mausoleum to celebrate the 99th National Sovereignty and Children's Day in Ankara, Turkey, April 23, 2019. (Xinhua/Qin Yanyang)