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Acquisition of a subsidiary (Tables) | 6 Months Ended
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Jun. 30, 2021
Business Combinations [Abstract] |
Schedule of Acquisition of a subsidiary |
|  | December 31, |  |  | June 30, |
|  | 2020 |  |  | 2021 |
Deposit paid for acquisition of a subsidiary |  | $ | - |  |  | $ | 3,096,646 |

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