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Inventory (Tables)
6 Months Ended
Nov. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory

Inventory consisted of the following:

 

   November 30,
2018
  May 31,
2018
    (Unaudited)      
Finished goods  $55,327   $113,134 
Raw materials   265,354    208,403 
   $320,681   $321,537