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A runner sits in a church prior to the start of the 170 km Mount Blanc Ultra Trail (UTMB) race around the Mont- Blanc crossing France, Italy and Swiss, on September 1, 2017 in Chamonix. The 15 th Ultra- Trail du Mont- Blanc (UTMB) is a mountain ultramarathon with numerous passages in high altitude (>2500 m) and in difficult weather conditions (night, wind, cold, rain or snow). It takes place once a year in the Alps, across France, Italy and Switzerland. (Photo by Jean-Pierre Clatot/AFP Photo)
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