code: def apply_T10(word):
      '''Any /iou/ sequence contains a syllable boundary between the first and
      second vowel.'''
      WORD = word
      offset = 0
  
      for iou in iou_sequences(WORD):
          i = iou.start(1) + 1 + offset
          WORD = WORD[:i] + '.' + WORD[i:]
          offset += 1
  
      RULE = ' T10' if word != WORD else ''
  
      return WORD, RULf apply_T10(word):
      '''Any /iou/ sequence contains a syllable boundary between the first and
      second vowel.'''
      WORD = word
      offset = 0
  
      for iou in iou_sequences(WORD):
          i = iou.start(1) + 1 + offset
          WORD = WORD[:i] + '.' + WORD[i:]
          offset += 1
  
      RULE = ' T10' if word != WORD else ''
  
      return WORD, RULE
docs: Any /iou/ sequence contains a syllable boundary between the first and
      second vowel.