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COMMITMENTS - Operating lease commitments (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of commitments [Line Items] |  |  |
Operating lease commitments | ¥ 60,159 | ¥ 5,793 | ¥ 19,694
Not later than one month [member] |  |  |
Disclosure of commitments [Line Items] |  |  |
Operating lease commitments | 13,431 | ¥ 5,793 | 13,902
After one year and within five years |  |  |
Disclosure of commitments [Line Items] |  |  |
Operating lease commitments | ¥ 46,728 |  | ¥ 5,792

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