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Cash, cash equivalents and restricted cash (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Cash on hand ¥ 20 ¥ 0
Cash at bank 11 67
Restricted cash at bank(1) 66 65
Cash, cash equivalents and restricted cash per consolidated statements of cash flow ¥ 97 ¥ 132