premise: Club Andino Bariloche is a mountaineering organisation based in San Carlos de Bariloche, in the Argentinian Andes. It was founded on the 13th of August 1931 by Otto Meiling, Emilio Frey, Juan Javier Neumeyer and Reinaldo Knapp, a group of friends who were exploring the region and making first ascents. Emilio Frey became its first president and continued in this role during 30 years.
hypothesis: Emilio Frey was the club's president for the first ten years.
reason: He was indeed president for the first ten years. Perhaps the system was thrown off by the wording?