-tree c-cor c-tec ccccc ccett ceco- ceere cefcu cefor ceoce ceoor cerc- cerce cerco cerec cerer ceret cero- ceroc cerou cerre cerro certe ceto- cette cfour cfu-e co-co cocc- cocce cocco coceo cocto cocur coete coeur cofer coffe cofre cofur cooee cooer coore coote corce core- coree corer coreu corfe corfo corfu coro- corot corre corte corto coter cott- cotte cotto cottu couco couer coure court couru couto coutu crece creer creft creo- creot crete cretu creu- creue croce croco croft crooe croot crore crote crott crout cruce cruet crufe cruft cruor crure ctree cttee cuero cueto cufeu cuffe cufre cuoco cuore curce curer curet curre curro curto cutco cutcu cutee cuter cutro cutto ecoff ectfe ecto- ector ectot eeeee ef-tu efere efetf effer effet efore efter efuru efutu eofor eorre erect erere eroor erore eroto error errtu erte erter eruct etete etoro etour etree etter eturu eucre euro- eurre feeor feere fefor feoff ferce feret ferr- ferre ferro ferte feter feto- fetor fette feuer feute focer foore foote force fore- foreo foret forro forte forto forur fotte fotur fouee fouet foure fouro freer freet frere frett freur froot frore frote fruct frute fruto ftrtt fu-fu fuco- fuero fuoco furo- furor futur o-fer occur ocftc ocoee ocote ocree octet octo- octor oeco- offer offof offre offto ofoto ofour ofter oo-er oocre ooooo orcet oreco oreo- orere orero orfeo orfeu orfoe orfor oroco oroer orout orret orter ortet ortoo oruce oruro orutu otere otero otoce ototo otour otter ottur oture ouert ouoro ource oure- outer outof outre outro outto r-co- recce recco recet rect- recte recto recue recur recut reece reefe reeft reere refco refer refet reffe reffo refut rere- reree reret retee reter retro rette retto reuer reuet reute ro-ro rocco rocor rocou roero roffe rofor rooer roofe rooft roore roote rooue rorer roter roto- rotor rotot rotte rotto rouer rouet roufe roure route routt rucer ruere ruete ruffe ruffo rufo- rurec ruter rutte ruutu tecou tefe teoco terce terco teret tereu teror terre terro tert- teruo teter tetr- tetro tette teuto tocco toco- tocut toece toeof toerr toeto tofet toffo tofor tofte toore torce toreo toret torre torro torte torto tortu torue toter toto- totoe totoo totte toure touro toute treco treer treet trefe treff trere trete trett treut troco troee trofe troff troft trott troue trout truce truco truer truff truro trute ttttt tucet tuctu tuero tuffe tufte tuotu turco turet turoc turot turre turro turtu turut tutee tuteo tutor tutte tutto tuuru u-cee ucero ufere ufofu uouee ureo- urour urter uruce urucu urutu uter- utero utro- utror utter uttur uturu ututo uuuuu