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Bank loans - Additional information (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Minimum |  |
Disclosure Of Bank Loans [Line Items] |  |
Borrowings, interest rate | 1.65% | 2.00%
Maximum |  |
Disclosure Of Bank Loans [Line Items] |  |
Borrowings, interest rate | 3.70% | 2.95%

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