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Stockholders' equity: (Tables)
12 Months Ended
Dec. 31, 2021
Stockholders' equity:  
Schedule of total share capital

    

Capital stock as of

    

Total shares

    

December 31, 

Description

2020

    

2021

2020

    

2021

“B” Series

277,050,000

277,050,000

Ps.

7,173,079

Ps.

7,173,079

“BB” Series

 

22,950,000

 

22,950,000

 

594,197

 

594,197

Total

300,000,000

300,000,000

Ps.

7,767,276

Ps.

7,767,276