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7. Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Cash And Cash Equivalents Tables  
Cash and cash equivalents
  December 31, 2017 December 31, 2016
     
Cash and banks 171,951 137,395
Cash equivalents 2,111,096  1,748,826 
  2,283,047  1,886,221