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8. Convertible notes (Details - Assumptions) - Convertible Notes [Member] - Conversion liability [Membmer]
9 Months Ended
Mar. 31, 2021
Measurement Input Expected Term [Member]  
Fair value measurement assumptions 0.3 year
Measurement Input Price Volatility [Member]  
Fair value measurement assumptions 35%
Measurement Input Risk Free Interest Rate [Member]  
Fair value measurement assumptions 0.04%
Measurement Input Expected Dividend Rate [Member]  
Fair value measurement assumptions 0%
Measurement input probability [Member]  
Fair value measurement assumptions 60%