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Flanked by Mexican Senate Deputy Chairman Francisco Arroyo Vieira, left, and Mexican Senate President Ernesto Cordero, right, Mexico's President Enrique Pena Nieto, center, shows off the signed document enacting education reform, at the National Palace in Mexico City, Monday, Feb. 25, 2013. The law which was approved by Congress in December, calls for creation of a professional system for hiring, evaluating and promoting teachers without the "discretionary criteria" currently used in a system where teaching positions are often bought or inherited. (AP Photo/Alexandre Meneghini)

Associated Press
Flanked by Mexican Senate Deputy Chairman Francisco Arroyo Vieira, left, and Mexican Senate President Ernesto Cordero, right, Mexico's President Enrique Pena Nieto, center, shows off the signed document enacting education reform, at the National Palace in Mexico City, Monday, Feb. 25, 2013. The law which was approved by Congress in December, calls for creation of a professional system for hiring, evaluating and promoting teachers without the "discretionary criteria" currently used in a system where teaching positions are often bought or inherited. (AP Photo/Alexandre Meneghini)
Flanked by Mexican Senate Deputy Chairman Francisco Arroyo Vieira, left, and Mexican Senate President Ernesto Cordero, right, Mexico's President Enrique Pena Nieto, center, shows off the signed document enacting education reform, at the National Palace in Mexico City, Monday, Feb. 25, 2013. The law which was approved by Congress in December, calls for creation of a professional system for hiring, evaluating and promoting teachers without the "discretionary criteria" currently used in a system where teaching positions are often bought or inherited. (AP Photo/Alexandre Meneghini)
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