In Western Catalan, unstressed vowels reduce to five: /e / > [e]; /o / > [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.
Try to answer this question if possible (otherwise reply "unanswerable"): In what other languages is this pattern found?
Italian and Portuguese