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INTANGIBLE ASSETS, NET - Estimated future amortization expense (Details) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2022 $ 55,914  
2023 55,307  
2024 55,307  
2025 55,307  
2026 55,307  
Thereafter 1,650,791  
Intangible assets, net $ 1,927,933 $ 1,881,722