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Accounts receivable, net - Allowance of credit losses (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Accounts receivable, net |  |
Balance at the beginning of the year | ¥ 96,959 | ¥ 85,115
Additions | 12,388 | 28,006
Write-off | (2,683) | (16,162)
Recovery of write-off | 368 |
Balance at the end of the year | ¥ 107,032 | ¥ 96,959

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