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FAIR VALUE MEASUREMENT - Sponsor Loan Measurement (Details) - CONCORD ACQUISITION CORP III - Sponsor Loans - Level 3 - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
FAIR VALUE MEASUREMENT |  |  |
Fair Value |  | $ 1,000,000 | $ 5,490,000
Unpaid Principal Balance | $ 6,900,000 | $ 6,900,000 |

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