code: def get_nfc_chars(self):
  		
  		ex = []
  
  		for char in self.ipa.keys():
  			if len(char) == 1:
  				decomp = unicodedata.normalize('NFD', char)
  				if len(decomp) == 2:
  					ex.append(char)
  
  		return set(ex)
docs: Returns the set of IPA symbols that are precomposed (decomposable)
  		chars. These should not be decomposed during string normalisation,
  		because they will not be recognised otherwise.
  
  		In IPA 2015 there is only one precomposed character: ç, the voiceless
  		palatal fricative.