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STOCK BASED COMPENSATION, Stock-based compensation expense (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Employees |  |  |
Stock-based compensation expense |  |  |
Stock-based compensation expense | $ 215,227 | $ 71,068 | $ 181,190
Third-party consultant |  |  |
Stock-based compensation expense |  |  |
Stock-based compensation expense | 26,893 | 12,776 |
Cost of revenues | Employees |  |  |
Stock-based compensation expense |  |  |
Stock-based compensation expense | 8,978 | 19,419 | 16,150
General and administrative expenses | Employees |  |  |
Stock-based compensation expense |  |  |
Stock-based compensation expense | 190,295 | 48,942 | 161,881
General and administrative expenses | Third-party consultant |  |  |
Stock-based compensation expense |  |  |
Stock-based compensation expense | 26,893 | 12,776 |
Selling and marketing expenses | Employees |  |  |
Stock-based compensation expense |  |  |
Stock-based compensation expense | $ 15,954 | $ 2,707 | $ 3,159

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