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Stockholders' equity: (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' equity:

Stockholders' equity:

								Capital stock as of
		Total shares						December 31,
Description		2018			2019			2018			2019
“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

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The disclosure of classes of share capital. [Refer: Share capital [member]]

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