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v3.19.1

21. Deferred revenue (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Deferred Revenue Tables Abstract |
Deferred revenue |
|  | 12.31.18 |  | 12.31.17
Non-current |  |  |  |
Nonrefundable customer contributions |  | 275,437 |  | 287,384
Total Non-current |  | 275,437 |  | 287,384
|  | 12.31.18 |  | 12.31.17
Current |  |  |  |
Nonrefundable customer contributions |  | 5,346 |  | 4,961
Total Current |  | 5,346 |  | 4,961

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