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Photo by: Chris Carlson

Rachel Cooper-Blackmore, 9, adds a note to a make-shift memorial at Mesa Verde Elementary School in Tucson, Ariz., Monday, Jan. 10, 2011. Christina Green, 9, was shot and killed during an attack at an event for U.S. Rep. Gabrielle Giffords, Arizona Democrat, Saturday. (AP Photo/Chris Carlson)

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