b-r-k bbbee be-er bebek bebel beber beebe beeke beele beffe befur beker bekke belee belef belek bellb belle belue belur berbe berek berel berk- berke berle berre berru beuer beule beure bleek bleer bleke blekk blere bleue bluer bluff blufr bluke blurb blure blurr brebu breef breek breel breer breke brell brere breu- brrrr bruer bruff bruke brule brull bubbe buber buble buell buffe bufle buker bukk- bulb- bulke bull- bulle bulul burek burel burke burle burru buruk ebber ebble ebell eberl eblul ebull ebure eeeee eeler efere effer efuru ekker ekuku ekuru elele ellek ellel eller ellul elulu eluru erbbe erber erere erkel eruke euell euler eurel eurre febel feble febre feele feere felle ferel ferle ferr- ferre feuer feule fleek fleer fleke flere flerk fleuk fleur fluff fluke flurb flure flurr freek freel freer freke frere freur fu-fu fulbe fulke fulle fullf furel kebbe kebek keber keble keefe keele keere kefee kelek kelle kerek kerel kerle kerre klefe klerk kluke kreef kreek kreel kreke krele krell kreuk krull kubek kuber kubul kukel kukle kukur kullu kulul kulur kurbu kurek kurku kurlu kurre kuruk lebel leber leeke leell leere lefeu leffe leful lekel lekeu leleu lelle lerer leuk- leuke lubbe luber lubke luble lubur lufre luker lukre lulle lulul lurer lurue rebbe rebel reber reefe reere refel refer reffe rekel rekke rekle relee relek relue rere- reree reuel reuer reule rubee rubel ruber rubke ruble ruele ruell ruere ruffe rukel rukke ruler ruule ubble uber- uelfe ufere ukeke ulker ullur ululu uluru urelu urkel urker urubu uuuuu