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SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 OF THE .

United statesSao pauloFederative republic of brazilCatia cristina teixeira pereiraCommission file noCompany registryOperational development energySabesp company orSecurities exchangeCommission fileSanitation companyCosta carvalhoRegulationst ruleSecurities exchange actMulti year investment planIntegra tiete