Although umlaut operated the same way in all the West Germanic languages, the exact words in which it took place and the outcomes of the process differ between the languages. Of particular note is the loss of word-final "-i" after heavy syllables. In the more southern languages (Old High German, Old Dutch, Old Saxon), forms that lost "-i" often show no umlaut, but in the more northern languages (Old English, Old Frisian), the forms do. Compare Old English "ġiest" "guest", which shows umlaut, and Old High German "gast", which does not, both from Proto-Germanic "*gastiz". That may mean that there was dialectal variation in the timing and spread of the two changes, with final loss happening before umlaut in the south but after it in the north. On the other hand, umlaut may have still been partly allophonic, and the loss of the conditioning sound may have triggered an "un-umlauting" of the preceding vowel. Nevertheless, medial "-ij-" consistently triggers umlaut although its subsequent loss is universal in West Germanic except for Old Saxon and early Old High German.