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Brazil's state-run Petrobras P-40 oil platform undergoes maintenance as it floats in the Guanabara Bay of Rio de Janeiro, Brazil in this Wednesday, March 21, 2001 file photo. A deep-water exploration area off the coast of Rio de Janeiro could contain as much as 33 billion barrels of oil, according to the head of Brazil's National Petroleum Agency Haroldo Lima. (AP Photo/Douglas Engle)
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