-tree c-tec ccccc ccett ceere cerc- cerce cerec cerer ceret cerre certe cette crece creer crete cretu creu- creue cruce cruet crure ctree cttee curce curer curet curre cutcu cutee cuter eeeee erect erere errtu erte erter eruct etete etree etter eturu eucre eurre recce recet rect- recte recue recur recut reece reere rere- reree reret retee reter rette reuer reuet reute rucer ruere ruete rurec ruter rutte ruutu terce teret tereu terre tert- teter tetr- tette treer treet trere trete trett treut truce truer trute ttttt tucet tuctu turet turre turtu turut tutee tutte tuuru u-cee urter uruce urucu urutu uter- utter uttur uturu uuuuu