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8. INTANGIBLE ASSETS (Details) - Estimate of Aggregate Amortization Expense for the years ending December 31,: (USD $)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Estimate of Aggregate Amortization Expense for the years ending December 31,: [Abstract]          
2014         $ 52,328
2015       51,753  
2016     48,979    
2017   44,411      
2018 $ 38,267