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Cash and cash equivalents: (Tables) | 12 Months Ended
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Dec. 31, 2023
Cash and cash equivalents: |
Schedule of cash and cash equivalents | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2023
Cash held at banks |  | Ps. | 7,667,651 |  | Ps. | 10,751,796
Short term investments |  | ​ | 5,507,340 |  | ​ | 3,121,101
Total cash and cash equivalents |  | Ps. | 13,174,991 |  | Ps. | 13,872,897

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