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In this Monday, November 23, 2020 file photo, the traditional Christmas lights shine over closed shops in downtown Vienna, Austria. Nations are struggling to reconcile cold medical advice with a holiday tradition that calls for big gatherings in often poorly ventilated rooms, where people chat, shout and sing together, providing an ideal conduit for a virus that has killed over 350,000 people in Europe so far. (Photo by Ronald Zak/AP Photo/File)
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