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PRINCIPAL ACTIVITIES AND ORGANIZATION - OPERATIONS AND FINANCIAL POSITIONS (Parenthetical) (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Variable interest entity, consolidated, liabilities, no recourse | ¥ 326,899 | ¥ 635,467

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