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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K Report of Foreign Private Issuer .

United statesRio de janeiroEstado do rioFederative republic of brazilBrentech energiaCarlos alberto rechelo netoAvenida henrique valadaresLtda enegenHenrique valadaresSecurities exchangeCommission file numberBrazilian petroleum corporationForeign privateExchange actFile numberPetroleum corporation