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14. Deposits (Tables)
12 Months Ended
Dec. 31, 2019
Deposits from customers [abstract]  
Schedule of deposits
      2019 2018
Judicial Deposits     841,746 726,491
Maintenance Deposits     830,282 647,057
Deposits in Guarantee for Leases Agreements     296,327 238,747
Total     1,968,355 1,612,295