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LOANS AND FINANCING - Principal and Interest (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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LOANS AND FINANCING |  |
Principal amount of loans and Financing | R$ 16,207,120 | R$ 20,049,854
Interest accrued of loans and Financing | 254,536 | 367,956
Total Loans and Financing | R$ 16,461,656 | R$ 20,417,810

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