Chile's President Sebastian Pinera, right, walks with Mexico's President Felipe Calderon, left, at the Teotihuacan archeological site on the outskirts of Mexico City, Saturday July 9, 2011. Pinera is on a three-day official visit to Mexico. (AP Photo/Franklin Reyes)

Associated Press
Chile's President Sebastian Pinera, right, walks with Mexico's President Felipe Calderon, left, at the Teotihuacan archeological site on the outskirts of Mexico City, Saturday July 9, 2011. Pinera is on a three-day official visit to Mexico. (AP Photo/Franklin Reyes)
Chile's President Sebastian Pinera, right, walks with Mexico's President Felipe Calderon, left, at the Teotihuacan archeological site on the outskirts of Mexico City, Saturday July 9, 2011. Pinera is on a three-day official visit to Mexico. (AP Photo/Franklin Reyes)
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