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Trade receivables (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Trade receivables |  |
Trade receivables | ¥ 940,989 | ¥ 891,174
Gross carrying amount |  |
Trade receivables |  |
Trade receivables | 998,036 | 934,152
Impairment loss allowance |  |
Trade receivables |  |
Trade receivables | ¥ (57,047) | ¥ (42,978)

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