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ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - Accounts payable and accrued expense balances - USD ($) | May 31, 2021 | May 31, 2020
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Accounts payable and accrued expense balances [Abstract] |  |
Accounts payable | $ 431,621 | $ 833,412
Accrued expense | 151,759 | 153,299
Total | $ 583,380 | $ 986,711

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