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34 Provisions (Tables)
 12 Months Ended
Dec. 31, 2020
Provisions [abstract]  
Schedule of provisions
     Non-current liabilities     Current liabilities 
     Contingencies 
At 12.31.19    2,808    291
         
Increases    1,107    163
Decreases    (105)    (12)
Recovery    (587)   -
Result from exposure to inflation for the year    (792)    (84)
At 12.31.20    2,431    358
         
At 12.31.18    2,240    392
Increases    1,687    174
Decreases    (28)    (105)
Result from exposure to inflation for the year    (1,091)    (170)
At 12.31.19    2,808    291