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Chinese Premier Li Keqiang, President of the Republic of Korea (ROK) Moon Jae-in and Japanese Prime Minister Shinzo Abe attend a launching ceremony of a commemorative envelope marking the 20th anniversary of trilateral cooperation at the Du Fu Thatched Cottage Museum in Chengdu, southwest China's Sichuan Province, Dec. 24, 2019. (Xinhua/Zhang Ling)