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v3.20.1

Summary of Significant Accounting Policies (Details) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Accounting Policies [Abstract] |  |  |
Exchange rate at balance sheets date | 6.9762 | 6.8755 |
Average exchange rate for each year | 6.8985 | 6.6090 | 6.7553

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