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Former Colombian presidential candidate Noemi Sanin signs a book during a ceremony to commemorate the 25th anniversary of the peace agreements between the government and the M-19 guerrilla, at the Simon Bolivar square in Bogota, on March 9, 2015. AFP PHOTO / GUILLERMO LEGARIA (Photo credit should read GUILLERMO LEGARIA/AFP/Getty Images)

Former Colombian presidential candidate Noemi Sanin signs a book during a ceremony to commemorate the 25th anniversary of the peace agreements between the government and the M-19 guerrilla, at the Simon Bolivar square in Bogota, on March 9, 2015. AFP PHOTO / GUILLERMO LEGARIA        (Photo credit should read GUILLERMO LEGARIA/AFP/Getty Images)