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FAIR VALUE MEASUREMENTS - Key assumptions (Details) - 2027 Convertible Notes | Sep. 30, 2024 | Sep. 30, 2023
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Volatility |  |
FAIR VALUE MEASUREMENTS |  |
Convertible notes | 0.80 | 0.9048
Discount rate |  |
FAIR VALUE MEASUREMENTS |  |
Convertible notes | 0.1334 | 0.1578
Risk-free interest rate |  |
FAIR VALUE MEASUREMENTS |  |
Convertible notes | 0.0363 | 0.047

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