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Summary of significant accounting policies - Currency exchange rates (Details) | Dec. 31, 2021 $ / ¥ | Dec. 31, 2020 $ / ¥ | Dec. 31, 2019 $ / ¥
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Foreign Currency Translation |  |  |
Foreign Currency Exchange Rate, Translation | 0.1569 | 0.1533 | 0.1436
Foreign Currency Average Exchange Rate Translation | 0.1550 | 0.1448 | 0.1448

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