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Trade receivables (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Notes and other explanatory information [abstract] |  |  |
Balances at the beginning of the year | R$ (44,046) | R$ (45,013) | R$ (32,980)
Additions | (74,552) | (42,708) | (47,819)
Write-offs | 57,200 | 43,675 | 35,786
Balances at the end of the year | R$ (61,398) | R$ (44,046) | R$ (45,013)

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