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Income tax benefits (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income tax benefits      
Current income tax ¥ (25,259) ¥ (16,780) ¥ (16,856)
Deferred income tax 87,406 128,875 153,987
Income tax benefit ¥ 62,147 ¥ 112,095 ¥ 137,131