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Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 2019
Intangible Assets, net [Abstract] |
Schedule of intangible assets |
|  | December 31, |  |  | March 31, |
|  | 2018 |  |  | 2019 |
Computer software at cost |  | $ | 31,025 |  |  | $ | 31,797 |
Accumulated amortization |  |  | (10,156 | ) |  |  | (11,992 | )
|  | $ | 20,869 |  |  | $ | 19,805 |

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