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Intangible Assets, net (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets |
|  | December 31, |  |  | September 30, |
|  | 2020 |  |  | 2021 |
Computer software at cost |  | $ | 32,686 |  |  | $ | 44,634 |
Accumulated amortization |  |  | (20,879 | ) |  |  | (23,216 | )
|  | $ | 11,807 |  |  | $ | 21,418 |

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