b-r-k bbbee be-er bebek beber becke becue beebe beeke beffe befur begee begge begue begur beker bekke berbe berck bercu berec bereg berek berge berk- berke berre berru beuer beure brebu brece breck breef breek breer breg- brege bregg breke brere breu- brrrr bruce bruck bruer bruff bruge brugg bruke bubbe buber bucek bucku bucur buffe buger bugge bugre buker bukk- burck burcu burek burge burgk burgu burke burru buruc buruk cbeff ccccc cebec ceber ceere cefcu cegge cerbu cerc- cerce cerec cerer cerge cerke cerre cfu-e crebe crece creek creer cregg creke creu- creue cruce cruck crufe cruke crure cubbe cubeb cuber cubub cucuk cufeu cuffe cufre cuker curce curer curre curug ebber eberg ebure ecker eecke eeeee efere effer efuru egger egrek ekker ekuku ekuru erbbe erber erceg erege erere erkec eruke eucre eurre febre feere fegue ferce ferr- ferre feuer feuge freck freek freer frege freke frere freur fu-fu fugee fuger fugue fugug gbeke gberg gberu geber gebke gebre gebur geere gefek gegge gerbe gerce gerke gerre geruf grebe grece grecu greef greek greer grefe greff grege gregg grgur grrrr grubb grube grufe gruff grure gubbe guber gubru guce gucer guere gurge gurke gurre gurur k-gee kebbe kebek keber kecer keefe keere kefee kekec kerek kergu kerre kreef kreek kreke kreuk krufc kruge kubek kuber kucer kucuk kugur kukec kukur kurbu kurek kurku kurre kuruc kuruk rebbe rebec rebeg reber recce recke recue recur reece reefe reege reere refer reffe regec reger regge regur rekke rere- reree reuer rubee ruber rubke rucer ruegg ruere ruffe ruger rugge rukke rurec u-cee uber- uceku ufere ugrug ukeke ukuug urger urker urubu uruce urucu uuuuu