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Financial risk management: (Tables) | 12 Months Ended
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Dec. 31, 2019
Financial risk management: |
Schedule of exchange rate risk |
|  | December 31,
|  | 2018 |  | 2019
Monetary position: |  |  |  |  |  |
Asset |  | Ps. | 45,003 |  | Ps. | 164,370
Liability |  |  | (3,149) |  |  | (4,853)
|  | Ps. | 41,854 |  | Ps. | 159,517
Schedule of liquidity risk |
|  | Under |  | Between 3 months |  | Between 1 |  | Between 2 and
At December 31, 2018 |  | 3 months |  | and one year |  | and 2 years |  | 5 years
Bank loans and interest |  | Ps. | 14,506 |  | Ps. | 161,009 |  | Ps. | 212,959 |  | Ps. | 6,829,639
Long term debt |  |  | 119,680 |  |  | 204,910 |  |  | 208,027 |  |  | 6,749,651
Suppliers |  |  | 313,577 |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 1,557,847 |  |  |  |  |  |  |  |  |
|  | Under |  | Between 3 months |  | Between 1 |  | Between 2 and
At December 31, 2019 |  | 3 months |  | and one year |  | and 2 years |  | 5 years
Bank loans and interest |  | Ps. | 14,639 |  | Ps. | 223,596 |  | Ps. | 228,073 |  | Ps. | 6,446,644
Long term debt |  |  | 111,676 |  |  | 199,696 |  |  | 204,492 |  |  | 6,284,077
Suppliers |  |  | 245,100 |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 1,378,657 |  |  |  |  |  |  |  |  |
Schedule of short term liquidity |
|  | December 31,
|  | 2018 |  | 2019
Current assets |  | Ps. | 6,000,912 |  | Ps. | 7,845,856
Current liabilities |  |  | 2,408,222 |  |  | 2,560,020
Short term position (liquidity) |  | Ps. | 3,592,690 |  | Ps. | 5,285,836

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