code: def build(self):
          
          code = _ean.EDGE[:]
          for number in self.ean[:4]:
              code += _ean.CODES['A'][int(number)]
          code += _ean.MIDDLE
          for number in self.ean[4:]:
              code += _ean.CODES['C'][int(number)]
          code += _ean.EDGE
          return [code]
docs: Builds the barcode pattern from `self.ean`.
  
          :returns: The pattern as string
          :rtype: String