Several long vowel shifts happened in Veluws, Sallaans, Stellingwarfs and Drèents; the changed occurred as the Hollandic dialect rose in prestige during the 17th century. The "oo" into "oe" and the "oe" into "uu" . Tweants and Eastern Achterhooks, by contrast, retained their old vowels. Compare the Tweants and Sallaans equivalents: "good - goed" ("good"); "hoes - huus" ("house"). Surprisingly, in many dialects, the "oe" sound was preserved in some words but changed to "uu" in others. As a result, in Sallaans "huis" (house) is "huus", but "muis" (mouse) is "moes" (as in Tweants).