-tree c-p-c c-tec ccccc ccett ceere cefcu cepet cerc- cerce cerec cerer ceret cerre certe cette cfu-e cpcfc cpctc crece creep creer creft crepe crept crepu crete cretu creu- creue creup cruce cruet crufe cruft crupe crure cteep ctree cttee cueup cufeu cuffe cufre cuper cupr- curce curer curet curre curup cutcu cutee cuter cutup eccup ectfe eeeee eepee ef-tu efere efetf effer effet efter efuru efutu eperc eptfe epure erect erept erere errtu erte erter eruct erupt etete etree etter eturu eucre eurre feere ferce feret ferr- ferre ferte feter fette feuer feute frcpc freep freer freet frere frett freur fruct frute ftrtt fu-fu futur p-rep pcept pcert pctct peece peere peert peete pepee peppe pept- pepup perce perec perer peret perre perte peruc perur petcu peter petr- petre petru pette petur peuce peure prece preef preff prete pruce prute pter- ptere ptprc ptpre ptprf ptprr ptprt ptpru puett pupet puppe purce puree purer purre purte puter putre putt- putte puttu putup re-up recce recep recet recpt rect- recte recue recur recut reece reefe reeft reepe reere refer refet reffe refut repec repet reppe reprt reput rere- reree reret retee reter rette reuer reuet reute rperf rucer ruere ruete ruffe rupee ruper rurec ruter rutte ruutu teepe teeup tefe tepee tepet tepeu teppu terce teret tereu terre tert- teter tetr- tette treer treet trefe treff trepp trept trere trete trett treut truce truer truff trupt trute ttttt tucep tucet tuctu tuffe tufte tupee turet turre turtu turup turut tutee tutte tuuru u-cee ufere upc-e upcut upeet upper upput upter urter uruce urucu urupe urutu uter- utter uttur uturu uuuuu