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Intangible asset (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cost      
Ending Balance ¥ 9,000 ¥ 9,000 ¥ 9,000
Accumulated Amortization      
Amortization 0 1,000  
Ending Balance 4,000 4,000 ¥ 3,000
Carrying Amount ¥ 5,000 ¥ 5,000