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Long-term investments - Equity method investments (Details) - CNY (¥) ¥ in Thousands | May 31, 2024 | Jan. 31, 2024
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Suzhou Photon-Matrix | Hubei ECARX |  |
Long-term investments |  |
Equity interest percentage |  | 13.10%
Derecognized equity carrying value |  | ¥ 34,829
Suzhou Photon-Matrix | Minimum |  |
Long-term investments |  |
Equity interest (as a percent) | 49.00% | 49.17%
Suzhou Photon-Matrix | Maximum |  |
Long-term investments |  |
Equity interest (as a percent) |  | 62.27%

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