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Balances and transactions with related parties: Transactions (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related parties: |  |  |
Revenue | $ 18,784,661 | $ 12,624,731 | $ 16,821,638
Technical assistance (Note 14.4) | (391,698) | (175,615) | (404,086)
Leasing | (6,467) | (6,304) |
Autobuses de Oriente |  |  |
Related parties: |  |  |
Revenue | 11,800 | 7,968 | 14,349
Autobuses Golfo Pacfico |  |  |
Related parties: |  |  |
Revenue | 6,468 | 4,862 | 7,290
Coordinados de Mxico de Oriente, S. A. de C. V. |  |  |
Related parties: |  |  |
Revenue | 162 | 164 | 157
Related parties |  |  |
Related parties: |  |  |
Leasing | (5,863) | (6,061) | (5,340)
Cleaning services | $ (12,307) | $ (11,848) | $ (11,544)

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