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Accounts receivable - Net: (Details) - MXN ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts receivable - Net: |  |  |
Clients | $ 2,191,439 | $ 1,458,653 |
Less: impairment provision | (317,664) | (346,183) | $ (191,766)
Clients, accounts receivable, net | 1,873,775 | 1,112,470 |
Notes receivable from clients | 4,463 | 245,757 |
Total accounts receivable | $ 1,878,238 | $ 1,358,227 |

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