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  President Barack Obama and Colombia's President Juan Manuel Santos wave to the audience at the end of their three-way conversation that included Brazil's President Dilma Rousseff, not pictured, at the CEO Summit of the Americas in Cartagena, Colombia, Saturday April 14, 2012. Regional business leaders are meeting parallel to the sixth Summit of the Americas which brings together presidents and prime ministers from Canada, the Caribbean, Latin America and the U.S. (AP Photo/Carolyn Kaster)