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Prepayments and other current assets (Details) - USD ($)
Mar. 31, 2022
Jun. 30, 2021
Prepaid Expense and Other Assets, Current $ 7,813,772 $ 4,693,000
Advance To Suppliers [Member]    
Prepaid Expense and Other Assets, Current 6,571,914 3,969,625
Prepaid And Other [Member]    
Prepaid Expense and Other Assets, Current $ 1,241,858 $ 723,375