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13. Financial assets at fair value through profit or loss (Tables)
 12 Months Ended
Dec. 31, 2018
Financial Assets At Fair Value Through Profit Or Loss  
Financial assets at fair value through profit or loss
       12.31.18     12.31.17 
           
Current          
Government bonds                    3,285,799                  1,829,888
Money market funds                          95,751                  2,448,120
Total current                     3,381,550                  4,278,008