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Intangible assets, net (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Intangible assets, net |
Schedule of intangible assets, net | ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2021 |  | 2022
​ | ​ | RMB | ​ | RMB
Software | ​ | 69,732 | ​ | 93,861
Less: accumulated amortization | ​ | (38,706) | ​ | (57,172)
Intangible assets, net | ​ | 31,026 |  | 36,689
Schedule of amortization expenses on intangible assets allocated to expense items | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 |  | 2021 |  | 2022
​ | ​ | RMB | ​ | RMB | ​ | RMB
Cost of revenues | ​ | 96 | ​ | 77 | ​ | —
Selling and marketing expenses |  | 1,027 | ​ | 876 |  | 257
General and administrative expenses |  | 2,535 | ​ | 5,845 |  | 9,590
Research and development expenses |  | 16,820 | ​ | 15,077 |  | 12,721
Total amortization |  | 20,478 | ​ | 21,875 |  | 22,568

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