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21. Deferred revenue
12 Months Ended
Dec. 31, 2018
Deferred Revenue  
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