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Cash flow information - Non cash investing and financing activities (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flow information      
Acquisition of right-of-use properties by leasing ¥ 76,534 ¥ 118,030 ¥ 38,646