b-r-k bbbee be-er bebek beber becke becue beebe beeke beker bekke berbe berck bercu berec berek berk- berke berre berru beuer beure brebu brece breck breek breer breke brere breu- brrrr bruce bruck bruer bruke bubbe buber bucek bucku bucur buker bukk- burck burcu burek burke burru buruc buruk ccccc cebec ceber ceere cerbu cerc- cerce cerec cerer cerke cerre crebe crece creek creer creke creu- creue cruce cruck cruke crure cubbe cubeb cuber cubub cucuk cuker curce curer curre ebber ebure ecker eecke eeeee ekker ekuku ekuru erbbe erber erere erkec eruke eucre eurre kebbe kebek keber kecer keere kekec kerek kerre kreek kreke kreuk kubek kuber kucer kucuk kukec kukur kurbu kurek kurku kurre kuruc kuruk rebbe rebec reber recce recke recue recur reece reere rekke rere- reree reuer rubee ruber rubke rucer ruere rukke rurec u-cee uber- uceku ukeke urker urubu uruce urucu uuuuu