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A man arranges a flag on the Boudhanath Stupa, a UNESCO world heritage site, in Kathmandu, Nepal, on Dec. 23, 2018. (Xinhua/ Sulav Shrestha)

A man arranges a flag on the Boudhanath Stupa, a UNESCO world heritage site, in Kathmandu, Nepal, on Dec. 23, 2018. (Xinhua/ Sulav Shrestha)