Read this: In Eastern Catalan (except Majorcan), unstressed vowels reduce to three: /a e ɛ/ > [ə]; /o ɔ u/ > [u]; /i/ remains distinct. There are a few instances of unreduced [e], [o] in some words. Alguerese has lowered [ə] to [a].

Where do unstressed vowels reduce to three?
What is the answer? (If it cannot be answered, return "unanswerable")
Eastern Catalan