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Financial risk management: Exchange rate risk (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial risk management: |  |
Asset | $ 60,411,211 | $ 57,515,881
Liability | (18,718,005) | (18,744,704)
Exchange rate risk |  |
Financial risk management: |  |
Asset | 88,426 | 164,370
Liability | (5,578) | (4,853)
Net assets at period closing | $ 82,848 | $ 159,517

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