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21 Inventories (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventories Abstract |
Schedule of inventories |
|  | 12.31.20 |  | 12.31.19
Current |  |  |  |
Supplies and spare-parts |  | 1,839 |  | 2,524
Advance to suppliers |  | 34 |  | 99
Total inventories |  | 1,873 |  | 2,623

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