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In this photo taken Friday, July 6, 2012, Ronaldo da Silva, left, and fellow inmates pedal stationary bikes to charge car batteries at a prison in Santa Rita do Sapucai, Brazil. An innovative program allows inmates at this medium-security prison to shave days off their sentence in exchange for riding stationary bikes hooked up to converted car batteries that are used to illuminate Santa Rita do Sapucai's town square. (AP Photo/Felipe Dana)

In this photo taken Friday, July 6, 2012, Ronaldo da Silva, left, and fellow inmates pedal stationary bikes to charge car batteries at a prison in Santa Rita do Sapucai, Brazil. An innovative program allows inmates at this medium-security prison to shave days off their sentence in exchange for riding stationary bikes hooked up to converted car batteries that are used to illuminate Santa Rita do Sapucai's town square. (AP Photo/Felipe Dana)

Prison inmates bike to freedom

An innovative program at a prison in Santa Rita do Sapucai, Brazil, allows inmates

to shave days off their sentence in exchange for riding stationary

bikes hooked up to converted car batteries that are used to illuminate the town's square. (July 10)