-tree b-r-k bbbee bccup be-er bebek beber becke becue becut beebe beeke beete beeut beker bekke beppe beppu 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-p-c c-tec ccccc ccett cebec ceber cebpb cebpe ceere cepet cerbu cerc- cerce cerec cerer ceret cerke cerre certe cette cpctc crebe crece creek creep creer creke crepe crept crepu crete cretu creu- creue creup cruce cruck cruet cruke crupe crure cteep ctree cttee cubbe cubeb cuber cubub cucuk cueup cuker cuper cupr- curce curer curet curre curup cutcu cutee cuter cutup ebber ebbet ebert ebure eccup ecker eecke eeeee eepee ekker ekuku ekuru eperc epptb epuku epure erbbe erber erect erept erere erkec errtu erte erter eruct eruke erupt eteke etete etree etrek etter eturu eucre eurre k-p-r k-t-b k-ute kebbe kebek keber kecer keepe keere kekec keppe kerek kerep keret kerre kertu ketek keter kette krbpe kreek kreep kreke krepe krete kreuk krupp kubek kuber kucer kucuk kukec kukup kukur kupce kuper kuppe kupur kurbu kurek kurku kurre kurte kuruc kuruk kurup kutte kuttu kutur p-rep pcept pcert pctct pebre pecke peebu peece peeke peere peert peete peket pekre pepee peppe pept- pepup perce perec perer peret perke perre perte peruc perur petbe petcu peter petr- petre petru pette petur peuce peure pre-k prece preke prete preuk prkce pruce prute ptcrb pter- ptere ptprb ptprc ptpre ptprk ptprr ptprt ptpru puber puett puker pupet puppe purce puree purer purku purre purte puter putre putt- putte puttu putup re-up rebbe rebec reber rebet rebut recce recep recet recke recpt rect- recte recue recur recut reece reepe reere rekke repec repet reppe reprt repub reput rere- reree reret retee reter rette reuer reuet reute rt-rk rubee ruber rubke rubup rucer ruere ruete rukke rupee ruper rurec ruter rutte ruutu tbtbt tbutt tcutk teber tebet tebuk tectb teepe teeup teket tekke tepee tepet tepeu tepke teppu terce terek teret tereu terre tert- teter tetr- tette trbuk treck treer treet trepp trept trere trete trett treut trubu truce truck truer truke trupt trute ttttt tubek tuber tucep tucet tucke tuctu tukur tupee tupek turbe turbt turck turek turet turku turre turtu turup turut tutee tutku tutte tuuru u-cee uber- uceku ukeep ukeke ukert upc-e upcut upeet upper upput upter urker urkut urpek urter urubu uruce urucu urupe urutu uter- utter uttur utube uturu uuuuu