-tree c-tec ccccc ccell ccett cclef ccrcl ccrel cctrl ceele ceere cefcu celer cell- celle celte cerc- cerce cerec cerer ceret cerre certe cette cfler cfu-e clcff cleef cleer cleet clefe cleft clerc clere clete clett clue- cluer clufe cluff clurr clute clutt crece creel creer creft crele crell crete cretu creu- creue creul crrel cruce cruel cruet crufe cruft crule crull crure ctcfl ctree ctrlc cttee ctulu cufeu cuffe cufre culet culle cullu culur curce curel curer curet curle curll curlu curre cutcu cutee cuter cutle cuuel eccle ectfe eeeee eeler ef-tu efere efetf effer effet eftel efter efuru efutu elect eleet elele eleut ellel eller ellet ellul elrec elulu eluru elute erect erere errtu erte ertel erter eruct etete etree ettel etter ettle eturu eucre euell euler eurel eurre fclef feele feere felce felet felle felte feltt ferce ferel feret ferle ferr- ferre ferte fetel feter fette feuer feule feute flect fleer fleet flere flert flete flett fleur fluce fluff flure flurr flurt flute freel freer freet frere frett freur fruct frute ftlee ftrtt fu-fu fulle fullf furel futur lecce leece leell leere leert lefeu leffe leful leleu lelle lerer letre lette letur leuc- leuce lucee lucet lucre lucur lufre lufte lulec lulle lulte luluc lulul lurer lurue lute- luter lutte recce recet rect- recte recue recur recut reece reefe reeft reere refel refer refet reffe refut relee relet relte relue rere- reree reret retee retel reter rette reuel reuer reuet reule reute rucer rucul ruele ruell ruere ruete ruffe ruler rurec ruter rutle rutte rutul ruule ruutu tcell tecul teele teell tefe telce tele- telec teler teleu tell- telle terce teret tereu terre tert- tetel teter tetle tetr- tette tlell tlett treer treet trefe treff trele trere trete trett treut truce truel truer truff trule trull trute ttttt tucet tuctu tuelf tuell tuelt tuffe tufte tulce tulet tulle turel turet turle turre turtu turul turut tutee tutel tutle tutte tuuru u-cee uccel uccle ucell uclue uelfe ufere ulcer ullet ullur ultre ululu uluru urcel urelu urtel urter urtlu uruce urucu urutu uter- utter uttur uturu uuuuu