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