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Stock compensation expense - USD ($) | 3 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Stock Compensation Expense |  |
General and administrative | $ 219,601 | $ 94,629
Research and development | 56,480 | 9,945
Operations | 63,261 | 2,487
Sales and marketing | 44,744 |
Total | $ 384,086 | $ 107,061

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