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Prepayments and other current assets (Details) - USD ($)
Dec. 31, 2021
Jun. 30, 2021
Total prepayments and other current assets $ 6,804,371 $ 4,693,000
Advance To Suppliers [Member]    
Total prepayments and other current assets 5,697,217 3,969,625
Prepaid And Other [Member]    
Total prepayments and other current assets $ 1,107,154 $ 723,375