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COMMITMENTS - Operating lease commitments (Details) - CNY (¥) ¥ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of commitments [Line Items] |  |
Operating lease commitments | ¥ 46,212 | ¥ 60,159
Not later than one month [member] |  |
Disclosure of commitments [Line Items] |  |
Operating lease commitments | 15,423 | 13,431
After one year and within five years |  |
Disclosure of commitments [Line Items] |  |
Operating lease commitments | ¥ 30,789 | ¥ 46,728

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