13 of 37: Cambodian students re-enact torture executed by the Khmer Rouge to mark the annual "Day of Anger" at Choeung Ek, a former Khmer Rouge "killing field" dotted with mass graves about nine miles (15 kilometers) south of Phnom Penh, Cambodia, Friday, May 20, 2011. Cambodian Buddhist monks, civil servants and residents on Friday gather to mark the annual commemoration by re-enacting torture and executions inflicted by the Khmer Rouge during its reign of terror in the 1970s. (AP Photo/Heng Sinith) (AP Photo/ Heng Sinith)

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