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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) | Sep. 30, 2021 | Sep. 30, 2020
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Accounting Policies [Abstract] |  |
Accounts Receivable, gross | $ 2,891,784 | $ 902,146
Other receivables | 421,681 |
Retainage receivable |  | 615
Provision for doubtful allowances | (693,508) | (42,970)
Total Accounts Receivable, net | $ 2,619,957 | $ 859,791

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