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Deferred revenue (Tables)
 12 Months Ended
Dec. 31, 2021
Schedule of deferred revenue

 

     12.31.21     12.31.20 
Non-current        
Nonrefundable customer contributions                  1,687                  2,220
         
         
     12.31.21     12.31.20 
Current        
Nonrefundable customer contributions                      44                      55