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REVENUES (Details 2) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Revenue    
Contract liabilities, brought forward $ 18,646 $ 19,843
Add: recognized as deferred revenue 35,582 47,090
Less: recognized as current period/year revenue (18,646) (48,287)
Contract liabilities, carried forward $ 35,582 $ 18,646