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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Jul. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]  
Summary of prepaid expenses and other current assets
   As of July 31, 
   2021   2020 
Prepayment for advertising service fee (a)  $600,000   $600,000 
Prepaid service fees   20,000    64,189 
Prepaid insurance service fee   58,150    
-
 
Advance to vendors   10,000    10,000 
Others   300    22,340 
Total  $688,451   $696,529