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Taxes (Details 2) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets: |  |
Provision for doubtful accounts | $ 37,042 | $ 5,571
Depreciation and amortization | 50,374 | 15,800
Total deferred tax assets | $ 87,416 | $ 21,371

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