-tree c-tec ccccc ccell ccett ccrcl ccrel cctrl ceele ceere celer cell- celle celte cerc- cerce cerec cerer ceret cerre certe cette cleer cleet clerc clere clete clett clue- cluer clurr clute clutt crece creel creer crele crell crete cretu creu- creue creul crrel cruce cruel cruet crule crull crure ctree ctrlc cttee ctulu culet culle cullu culur curce curel curer curet curle curll curlu curre cutcu cutee cuter cutle cuuel eccle eeeee eeler 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 lecce leece leell leere leert leleu lelle lerer letre lette letur leuc- leuce lucee lucet lucre lucur lulec lulle lulte luluc lulul lurer lurue lute- luter lutte recce recet rect- recte recue recur recut reece reere relee relet relte relue rere- reree reret retee retel reter rette reuel reuer reuet reule reute rucer rucul ruele ruell ruere ruete ruler rurec ruter rutle rutte rutul ruule ruutu tcell tecul teele teell telce tele- telec teler teleu tell- telle terce teret tereu terre tert- tetel teter tetle tetr- tette tlell tlett treer treet trele trere trete trett treut truce truel truer trule trull trute ttttt tucet tuctu tuell tuelt tulce tulet tulle turel turet turle turre turtu turul turut tutee tutel tutle tutte tuuru u-cee uccel uccle ucell uclue ulcer ullet ullur ultre ululu uluru urcel urelu urtel urter urtlu uruce urucu urutu uter- utter uttur uturu uuuuu