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OPERATING LEASES - Maturities of lease liabilities (Details) - CNY (¥)
Dec. 31, 2023
Dec. 31, 2022
OPERATING LEASES    
Within 1 year ¥ 5,176,941  
After 1 year but within 2 years 284,407  
Total undiscounted lease payment 5,461,348  
less: Imputed interest (86,861)  
Present value of lease liabilities ¥ 5,374,487 ¥ 15,312,776