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Income taxes
 6 Months Ended
Jun. 30, 2024
Income Tax Disclosure [Abstract]  
Income taxes Income taxes
The statutory income tax rate for the Group is 25% for the six months ended June 30, 2023 and 2024. The effective income tax rate for the six months ended June 30, 2023 and 2024 differs from the PRC statutory income tax rate of 25%, primarily due to the recognition of full valuation allowance for deferred income tax assets of loss-making entities.