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Taxes - Provision for income tax (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Taxes      
Current $ 25,571 $ 16,753 $ (29,813)
Deferred 0 0 0
Total $ 25,571 $ 16,753 $ (29,813)