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Cash and cash equivalents: (Tables) | 12 Months Ended
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Dec. 31, 2021
Cash and cash equivalents: |
Schedule of cash and cash equivalents | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash held at banks |  | Ps. | 3,514,293 |  | Ps. | $ | 6,589,294
Short term investments |  | ​ | 1,678,335 |  | ​ | ​ | 2,180,768
Total cash and cash equivalents |  | Ps. | 5,192,628 |  | Ps. | ​ | 8,770,062
​

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