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SEGMENT INFORMATION - Net sales by product (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net sales by products |  |  |  |
Net sales | R$ 9,844,439 | R$ 7,995,673 | R$ 18,733,605 | R$ 14,976,466
Market pulp |  |  |  |
Net sales by products |  |  |  |
Net sales |  |  | R$ 16,038,957 | R$ 12,862,936
Fluff pulp |  |  |  |
Net sales by products |  |  |  |
Percentage of total net sales |  |  | 0.70% | 0.70%
Printing and writing paper |  |  |  |
Net sales by products |  |  |  |
Net sales |  |  | R$ 2,149,273 | R$ 1,661,611
Tissue |  |  |  |
Net sales by products |  |  |  |
Percentage of total net sales |  |  | 2.20% | 2.20%
Paperboard |  |  |  |
Net sales by products |  |  |  |
Net sales |  |  | R$ 524,146 | R$ 430,292
Other |  |  |  |
Net sales by products |  |  |  |
Net sales |  |  | R$ 21,229 | R$ 21,627

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