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Passengers of the Democratic People's Republic of Korea (DPRK) wave to South korean reporters in the DPRK's border town of Kaesong on Dec. 26, 2018. (Xinhua)

Passengers of the Democratic People's Republic of Korea (DPRK) wave to South korean reporters in the DPRK's border town of Kaesong on Dec. 26, 2018. (Xinhua)