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Snow ploughs are pictured clearing snow off the road at the Great St. Bernard pass, Switzerland, Tuesday May 16, 2017. The snow ploughs and snow blowers make their way slowly through the mountain every spring and will have carved through layers several meter-deep during a four-week operation this year. The Col du Grand-Saint-Bernard, in French, is the third highest road pass of Switzerland and connects the canton of Valais to Italy. (KEYSTONE/Valentin Flauraud)