That quickly explodes if you need more than one diacritic per letter (e.g. Vietnamese often has two, and then there's https://en.wikipedia.org/wiki/Internationa

That quickly explodes if you need more than one diacritic per letter (e.g. Vietnamese often has two, and then there's https://en.wikipedia.org/wiki/International_Phonetic_Alphabet#Diacritics_and_prosodic_notation https://en.wikipedia.org/wiki/International_Phonetic_Alphabe...).