docs: def get_precomposed_chars():
  	"""
  	Return the set of IPA characters that are defined in normal form C in the
  	spec. As of 2015, this is only the voiceless palatal fricative, ç.
  	"""
  	return set([
  		letter for letter in chart.consonants
  		if unicodedata.normalize('NFD', letter) != letter ])