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Inventory (Tables)
9 Months Ended
Feb. 28, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory

Inventory consisted of the following:

 

   February 28,
2019
  May 31,
2018
   (Unaudited)   
Finished goods  $229,746   $113,134 
Raw materials   198,015    208,403 
   $427,761   $321,537