bbbee be-er beber beebe beffe befur beppe beppu berbe berre berru beuer beure brebu breef breer brere breu- brrrr bruer bruff bubbe buber buffe burru ebber ebure eeeee eepee efere effer efuru epure erbbe erber erere eurre febre feere ferr- ferre feuer freep freer frere freur fu-fu p-rep pebre peebu peere pepee peppe pepup perer perre perur peure preef preff puber puppe puree purer purre re-up rebbe reber reefe reepe reere refer reffe reppe repub rere- reree reuer rperf rubee ruber rubup ruere ruffe rupee ruper uber- ufere upper urubu urupe uuuuu