code: def find_untranscribed_wavs(wav_path: Path, transcription_path: Path, label_type: str) -> List[str]:
      
      audio_files = wav_path.glob("**/*.wav")
      transcription_files = transcription_path.glob("**/*.{}".format(label_type))
  
      transcription_file_prefixes = [t_file.stem for t_file in transcription_files]
  
      untranscribed_prefixes = [] # type: List[str]
      for a_file in audio_files:
          if a_file.stem not in transcription_file_prefixes:
              untranscribed_prefixes.append(a_file.stem)
      return untranscribed_prefixes
docs: Find the prefixes for all the wav files that do not have an associated transcription
      Args:
          wav_path: Path to search for wav files in
          transcription_path: Path to search for transcriptions in
          label_type: The type of labels for transcriptions. Eg "phonemes" "phonemes_and_tones"
      Returns:
          A list of all untranscribed prefixes