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PREPAYMENTS, NET (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Notes to Financial Statements |  |  |
Prepayments | $ 2,065,410 | $ 487,841 |
Allowance for doubtful accounts | (147,630) | (188,264) | $ (127,740)
Total prepayments, net | $ 1,917,780 | $ 299,577 |

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