-tree c-tec ccccc ccell ccett ccrcl ccrel cctrl ceele ceere celer cell- celle celte cerc- cerce cerec cerer ceret cerke cerre certe cette cleck cleek cleer cleet cleke clerc clere clerk clete clett cleuk cluck clue- cluer cluke clurr clute clutt crece creek creel creer creke crele crell crete cretu creu- creue creul crrel cruce cruck cruel cruet cruke crule crull crure ctree ctrlc cttee ctulu cucuk cuker culet culle cullu culur curce curel curer curet curle curll curlu curre cutcu cutee cuter cutle cuuel eccle eckel ecker eckle eecke eeeee eeler ekker ekuku ekuru elect eleet elele eleut ellek ellel eller ellet ellul elrec eltek elulu eluru elute erect erere erkec erkel errtu erte ertel erter eruct eruke eteke etete etree etrek ettel etter ettle eturu eucre euell euler eurel eurre k-tel k-ute kcell kecel kecer keele keere kekec kelce kelek kelle kerek kerel keret kerle kerre kertu ketek ketel keter kette klece kleet klerk klett kluke klute kreek kreel kreke krele krell krete kreuk krull kucer kucuk kukec kukel kukle kukur kullu kulte kulul kulur kurek kurku kurlu kurre kurte kuruc kuruk kutlu kutte kuttu kutur lecce leece leeke leell leere leert lekel lekeu leleu lelle lerer letek letre lette letur leuc- leuce leuk- leuke lucee lucet lucke lucre lucur luker luket lukre lukut lulec lulle lulte luluc lulul lurck lurer lurue lute- lutek luter lutke lutte recce recet recke rect- recte recue recur recut reece reere rekel rekke rekle relee relek relet relte relue rere- reree reret retee retel reter rette reuel reuer reuet reule reute rt-rk rucer rucul ruele ruell ruere ruete rukel rukke ruler rurec ruter rutle rutte rutul ruule ruutu tcell tcutk tecul teele teell tekel teket tekke telce tele- telec telek teler teleu tell- telle teluk terce terek teret tereu terre tert- tetel teter tetle tetr- tette tlell tlett treck treer treet trele trere trete trett treut truce truck truel truer truke trule trull trute ttttt tucet tucke tuctu tuell tuelt tukul tukur tulce tulet tulku tulle turck turek turel turet turku turle turre turtu turul turut tutee tutel tutku tutle tutte tuuru u-cee uccel uccle uceku ucell uclue ukeke ukert ulcer ulker ullet ullur ultre ululu uluru urcel urelu urkel urker urkut urtel urter urtlu uruce urucu urutu uter- utter uttur uturu uuuuu