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OPERATING LEASES - Schedule of maturities of lease liabilities (Details)
Jul. 31, 2020
USD ($)
OPERATING LEASES  
2021 $ 942,360
2022 667,392
2023 477,151
2024 481,817
2025 396,682
2025 and thereafter 2,169,094
Total lease payments 5,134,496
Less: imputed interest (1,001,257)
Present value of lease liabilities $ 4,133,239