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PREPAYMENTS, NET (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Notes to Financial Statements |  |  |
Prepayments | $ 487,841 | $ 1,457,272 |
Allowance for doubtful accounts | (188,264) | (124,740) | $ (127,470)
Total prepayments, net | $ 299,577 | $ 1,332,532 |

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