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A participant wearing a Santa Claus cap swims in the Limmat river during the traditional Santa Claus swimming event in Zurich, Switzerland, Dec. 3, 2017. (Xinhua/Michele Limina)
A participant wearing a Santa Claus cap swims in the Limmat river during the traditional Santa Claus swimming event in Zurich, Switzerland, Dec. 3, 2017. (Xinhua/Michele Limina)