code: def modcheck(value):
      
      # move country code and check numbers to end
      rearranged = value[4:] + value[:4]
      # convert letters to numbers
      converted = [char_value(char) for char in rearranged]
      # interpret as integer
      integerized = int(''.join([str(i) for i in converted]))
      return (integerized % 97 == 1)
docs: Check if the value string passes the mod97-test.