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Cash and cash equivalents: (Tables)

12 Months Ended

Dec. 31, 2021

Cash and cash equivalents:

Schedule of cash and cash equivalents

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​	​	​	​	​	​	​	​
​	​	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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