Masked protesters stand near police guarding a public building during a rally in Bogota, Colombia, on August 29, 2013. Students are protesting in support of farmers who demand lower fertilizer prices, complain of being undercut by cheap imports from near and far of products including potatoes, onions and milk, and say their sector is being hurt by free trade and other agreements promoted by the government. (Photo by Carlos Julio Martinez/Associated Press)
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