code: def _scansion(self, sentence_syllables):
          
  
          scanned_text = []
          for sentence in sentence_syllables:
              scanned_sent = []
              for syllable in sentence:
                  if self._long_by_position(syllable, sentence) or \
                     self._long_by_nature(syllable):
                      scanned_sent.append('¯')
                  else:
                      scanned_sent.append('˘')
              if len(scanned_sent) > 1:
                  del scanned_sent[-1]
                  scanned_sent.append('x')
              scanned_text.append(''.join(scanned_sent))
          return scanned_text
docs: Replace long and short values for each input syllable.
          :param sentence_syllables: A list of strings
          :return : '˘' and '¯' to represent short and long syllables,
          respectively
          :rtype : list