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21. Deferred revenue (Details) - ARS ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
SummaryOfDeferredRevenueLineItems [Line Items] |  |
Noncurrent | $ 275,437 | $ 287,384
Current | 5,346 | 4,961
Nonrefundable customer contributions |  |
SummaryOfDeferredRevenueLineItems [Line Items] |  |
Noncurrent | 275,437 | 287,384
Current | $ 5,346 | $ 4,961

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