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Related party transactions and balances (Details) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | ---
Related Party Transaction [Line Items] |  |  |
Due from related party |  |  | ¥ 60,280
Due to related parties |  |  | 350,000
Shenzhen Mengyun 19. 9 Equity Investment [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due from related party |  |  | 60,280
Yuxiu Han [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due to related parties |  |  | ¥ 350,000

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