context: In Western Catalan, unstressed vowels reduce to five: /e ɛ/ > [e]; /o ɔ/ > [o]; /a u i/ remain distinct. This reduction pattern, inherited from Proto-Romance, is also found in Italian and Portuguese. Some Western dialects present further reduction or vowel harmony in some cases.
question: কোন অক্ষরগুলো এখনও স্বতন্ত্র?
answers: /a u i/