-tree b-r-k bbbee be-er bebek beber becke becue becut beebe beeke beete beeut beker bekke berbe berck bercu berec berek beret berk- berke berre berru berte betee beter betke betre bett- bette beuer beure beute brebu brece breck breek breer breet breke brere brett breu- brrrr bruce bruck bruer bruet bruke brute btc-e btr-t bubbe buber bucek bucet bucku bucur buker buket bukk- burck burcu burek buret burke burru burte burtt buruc buruk burut butec buter butke butte butut c-tec ccccc ccett cebec ceber ceere cerbu cerc- cerce cerec cerer ceret cerke cerre certe cette crebe crece creek creer creke crete cretu creu- creue cruce cruck cruet cruke crure ctree cttee cubbe cubeb cuber cubub cucuk cuker curce curer curet curre cutcu cutee cuter ebber ebbet ebert ebure ecker eecke eeeee ekker ekuku ekuru erbbe erber erect erere erkec errtu erte erter eruct eruke eteke etete etree etrek etter eturu eucre eurre k-t-b k-ute kebbe kebek keber kecer keere kekec kerek keret kerre kertu ketek keter kette kreek kreke krete kreuk kubek kuber kucer kucuk kukec kukur kurbu kurek kurku kurre kurte kuruc kuruk kutte kuttu kutur rebbe rebec reber rebet rebut recce recet recke rect- recte recue recur recut reece reere rekke rere- reree reret retee reter rette reuer reuet reute rt-rk rubee ruber rubke rucer ruere ruete rukke rurec ruter rutte ruutu tbtbt tbutt tcutk teber tebet tebuk tectb teket tekke terce terek teret tereu terre tert- teter tetr- tette trbuk treck treer treet trere trete trett treut trubu truce truck truer truke trute ttttt tubek tuber tucet tucke tuctu tukur turbe turbt turck turek turet turku turre turtu turut tutee tutku tutte tuuru u-cee uber- uceku ukeke ukert urker urkut urter urubu uruce urucu urutu uter- utter uttur utube uturu uuuuu