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7 Cash and cash equivalents (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash and cash equivalents [abstract] |
Schedule of cash and cash equivalents |
| December 31, 2020 | December 31, 2019
Cash and banks | 74,033 | 176,497
Cash equivalents | 322,368 | 2,076,713
Total | 396,401 | 2,253,210

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