-tree b-r-k bbbee be-er bebek beber becke becue becut beebe beeft beeke beete beeut beffe befur 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 breef breek breer breet breke brere brett breu- brrrr bruce bruck bruer bruet bruff bruke brute btc-e btr-t bubbe buber bucek bucet bucku bucur bufet buffe buker buket bukk- burck burcu burek buret burke burru burte burtt buruc buruk burut butec buter butke butte butut c-tec cbeff cbeft ccccc ccett cebec ceber ceere cefcu cerbu cerc- cerce cerec cerer ceret cerke cerre certe cette cfu-e crebe crece creek creer creft creke crete cretu creu- creue cruce cruck cruet crufe cruft cruke crure ctree cttee cubbe cubeb cuber cubub cucuk cufeu cuffe cufre cuker curce curer curet curre cutcu cutee cuter ebber ebbet ebert ebure ecker ectfe eecke eeeee ef-tu efere efetf effer effet efter efuru efutu ekker ekuku ekuru erbbe erber erect erere erkec errtu erte erter eruct eruke eteke etete etree etrek etter eturu eucre eurre febre feere ferce feret ferr- ferre ferte feter fette feuer feute freck freek freer freet freke frere frett freur fruct frute ftrtt fu-fu futur k-t-b k-ute kebbe kebek keber kecer keefe keere kefee kekec kerek keret kerre kertu ketek keter kette kreef kreek kreke krete kreuk krufc kruft 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 reefe reeft reere refer refet reffe refut rekke rere- reree reret retee reter rette reuer reuet reute rt-rk rubee ruber rubke rucer ruere ruete ruffe rukke rurec ruter rutte ruutu tbtbt tbutt tcutk teber tebet tebuk tectb tefe teket tekke terce terek teret tereu terre tert- teter tetr- tette trbuk treck treer treet trefe treff trere trete trett treut trubu truce truck truer truff truke trute ttttt tubek tuber tucet tucke tuctu tuffe tufte tukur turbe turbt turck turek turet turku turre turtu turut tutee tutku tutte tuuru u-cee uber- uceku ufere ukeke ukert urker urkut urter urubu uruce urucu urutu uter- utter uttur utube uturu uuuuu