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Accounts Receivable (Tables)
9 Months Ended
Feb. 28, 2018
Receivables [Abstract]  
Schedule of accounts receivable

   February 28,
2018
   May 31,
2017
 
         
Accounts receivable  $42,916   $33,513 
Less: Allowance for bad debts   (3,568)   (810)
   $39,348   $32,703