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v3.25.1

Summary of significant accounting policies (Details 5) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Total | $ 2,446,714 | ¥ 17,587,961 | ¥ 3,797,862
Shanghai Weimu [Member] |  |  |
Total | 625,318 | 4,495,040 | 3,065,579
Viwo Tech [Member] |  |  |
Total | 1,821,396 | 13,092,921 | 741,356
Vize Technology Limited [Member] |  |  |
Total |  |  | ¥ (9,073)

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