-tree c-cor c-tec ccccc ccett ceco- ceere ceoce ceoor cerc- cerce cerco cerec cerer ceret cero- ceroc cerou cerre cerro certe ceto- cette co-co cocc- cocce cocco coceo cocto cocur coete coeur cooee cooer coore coote corce core- coree corer coreu coro- corot corre corte corto coter cott- cotte cotto cottu couco couer coure court couru couto coutu crece creer creo- creot crete cretu creu- creue croce croco crooe croot crore crote crott crout cruce cruet cruor crure ctree cttee cuero cueto cuoco cuore curce curer curet curre curro curto cutco cutcu cutee cuter cutro cutto ecto- ector ectot eeeee eorre erect erere eroor erore eroto error errtu erte erter eruct etete etoro etour etree etter eturu eucre euro- eurre occur ocoee ocote ocree octet octo- octor oeco- oo-er oocre ooooo orcet oreco oreo- orere orero oroco oroer orout orret orter ortet ortoo oruce oruro orutu otere otero otoce ototo otour otter ottur oture ouert ouoro ource oure- outer outre outro outto r-co- recce recco recet rect- recte recto recue recur recut reece reere rere- reree reret retee reter retro rette retto reuer reuet reute ro-ro rocco rocor rocou roero rooer roore roote rooue rorer roter roto- rotor rotot rotte rotto rouer rouet roure route routt rucer ruere ruete rurec ruter rutte ruutu tecou teoco terce terco teret tereu teror terre terro tert- teruo teter tetr- tetro tette teuto tocco toco- tocut toece toerr toeto toore torce toreo toret torre torro torte torto tortu torue toter toto- totoe totoo totte toure touro toute treco treer treet trere trete trett treut troco troee trott troue trout truce truco truer truro trute ttttt tucet tuctu tuero tuotu turco turet turoc turot turre turro turtu turut tutee tuteo tutor tutte tutto tuuru u-cee ucero uouee ureo- urour urter uruce urucu urutu uter- utero utro- utror utter uttur uturu ututo uuuuu