b-r-k bbbee be-er bebek bebel beber beebe beeke beele beker bekke belee belek bellb belle belue belur berbe berek berel berk- berke berle berre berru beuer beule beure bleek bleer bleke blekk blere bleue bluer bluke blurb blure blurr brebu breek breel breer breke brell brere breu- brrrr bruer bruke brule brull bubbe buber buble buell buker bukk- bulb- bulke bull- bulle bulul burek burel burke burle burru buruk ebber ebble ebell eberl eblul ebull ebure eeeee eeler ekker ekuku ekuru elele ellek ellel eller ellul elulu eluru erbbe erber erere erkel eruke euell euler eurel eurre kebbe kebek keber keble keele keere kelek kelle kerek kerel kerle kerre klerk kluke 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 lekel lekeu leleu lelle lerer leuk- leuke lubbe luber lubke luble lubur luker lukre lulle lulul lurer lurue rebbe rebel reber reere rekel rekke rekle relee relek relue rere- reree reuel reuer reule rubee rubel ruber rubke ruble ruele ruell ruere rukel rukke ruler ruule ubble uber- ukeke ulker ullur ululu uluru urelu urkel urker urubu uuuuu