In this photo provided by Miraflores Presidential Press Office, Venezuela's President Hugo 

In this photo provided by Miraflores Presidential Press Office, Venezuela's President Hugo Chavez raises Venezuela's flag during a ceremony commemorating Venezuela's bicentennial in Bolivar square in Caracas, Venezuela, Thursday July 14, 2011. Ailing Chavez rallied hundreds of supporters, singing folk songs and calling cancer one of his life's greatest battles. Chavez has been limiting his public appearances since returning to Venezuela on July 4, two weeks after undergoing surgery in Cuba to remove a cancerous tumor from his pelvic region.  (AP Photo/Miraflores Presidential Office)
Associated Press
In this photo provided by Miraflores Presidential Press Office, Venezuela's President Hugo Chavez raises Venezuela's flag during a ceremony commemorating Venezuela's bicentennial in Bolivar square in Caracas, Venezuela, Thursday July 14, 2011. Ailing Chavez rallied hundreds of supporters, singing folk songs and calling cancer one of his life's greatest battles. Chavez has been limiting his public appearances since returning to Venezuela on July 4, two weeks after undergoing surgery in Cuba to remove a cancerous tumor from his pelvic region. (AP Photo/Miraflores Presidential Office)
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