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Zheng Panqi (front left) and three other "Red Guards" carrying their small books of quotations from Chairman Mao Zedong in 1966. [China Daily/Courtesy of Hei Ming]  

Zheng Panqi in 2007. The four met in Tian'anmen Square, and then they went their own ways and lost contact. [China Daily/Courtesy of Hei Ming]