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Financial risk management: Short term liquidity (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financial risk management: |  |
Current assets | $ 7,716,049 | $ 7,845,856
Current liabilities | 2,767,087 | 2,560,020
Short term position (liquidity) | $ 4,948,962 | $ 5,285,836

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