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TRADE RECEIVABLES (Details) - CNY (¥)
¥ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
TRADE RECEIVABLES        
Trade receivables     ¥ 798,905 ¥ 822,747
Less: provision for impairment ¥ (780,012) ¥ (771,331)    
Current trade receivables ¥ 18,893 ¥ 51,416