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Front-rounded vowels

Characteristic of the Gallo-Romance and Rhaeto-Romance languages are the front rounded vowels /y ø œ/. All of these languages, with the exception of Catalan, show an unconditional change /u/ > /y/, e.g. lūnam > French lune /lyn/, Occitan /ˈlyno/. Many of the languages in Switzerland and Italy show the further change /y/ > /i/. Also very common is some variation of the French development /ɔː oː/ (lengthened in open syllables) > /we ew/ > /œ œ/, with mid back vowels diphthongizing in some circumstances and then re-monophthongizing into mid-front rounded vowels. (French has both /ø/ and /œ/, with /ø/ developing from /œ/ in certain circumstances.)