-tree c-cor c-tec ccccc ccett ceco- ceere ceoce ceoor cerc- cerce cerco cerec cerer ceret cerke cero- ceroc cerou cerre cerro certe ceto- cette co-co cocc- cocce cocco coceo cocke cockt cocto cocur coete coeur coker coket cokk- cokot cooee cooer cooke cookt coore coote corce core- coree corer coreu corke coro- corot corre corte corto coter cott- cotte cotto cottu couco couer coure court couru couto coutu crece creek creer creke creo- creot crete cretu creu- creue croce crock croco croke crokt crooe crook croot crore crote crott crouk crout cruce cruck cruet cruke cruor crure ctree cttee cucuk cuero cueto cuker cukor cuoco cuore curce curer curet curre curro curto cutco cutcu cutee cuter cutro cutto ecker ecto- ector ectot eecke eeeee ekeko ekker ektor ekuku ekuru eorre erect erere erkec erkko erkoc eroor erore eroto error errtu erte erter eruct eruke eteke etete etoko etoro etour etree etrek etter eturu eucre euro- eurre k-ute kecer keere kekec kerek keret kerre kertu ketek keter keto- ketou kette ketto ko-ko kocek kocer kocke koeru koker koket kokko kokor kokot kokou kokre kokur kokut kooru korck korec korek korke korku koror korro korte kortu korue koruk kotor kotto kottu kotur kouer koure kouto kre-o kreek kreke kreo- krete kreuk krock kroke kroot krout krtok kruto kucer kucuk kukec kukko kukok kukur kurek kurku kurre kurte kuruc kuruk kutte kuttu kutur occur ocker ockro ocoee ocote ocree octet octo- octor oeco- okeke okere oketo okker okkur okoc okoro okrut okuku okuru oo-er oocre ooooo orcet oreck oreco oreo- orere orero orkut oroco oroer oroke orout orret orter ortet ortok ortoo oruce oruku oruro orutu otere otero otoce otoku ototo otour otrok otter ottur otuke oture ouert ouoro ource oure- outer outre outro outto r-co- recce recco recet recke rect- recte recto recue recur recut reece reere rekke rere- reree reret retee reter retro rette retto reuer reuet reute ro-ro rocco rocke rocko rocor rocou roero rokee roker roket rokke rokkk rokot rokto rooer rooke roore roote rooue rorer rorke roter rotko roto- rotor rotot rotte rotto rouer rouet rouke rouko roure route routt rt-rk rucer ruere ruete rukke rurec ruter rutte ruutu tcutk tecou teeko teket tekke tekko teoco terce terco terek teret tereu terok teror terre terro tert- teruo teter tetr- tetro tette teuto tocco toco- tocut toece toerr toeto toker tokke tokko toko- tokor tokuo tokur tooke toore torce toreo toret torke torok torre torro torte torto tortu torue toter toto- totoe totok totoo totte touck touke toure touro toute treck treco treer treet trere trete trett treut trock troco troee troke trott troue trout truce truck truco truer truke truro trute tteok ttttt tucet tucke tuctu tuero tukur tuotu turck turco turek turet turko turku turoc turok turot turre turro turtu turut tutee tuteo tutku tutor tutte tutto tuuru u-cee uceku ucero ukeke ukert uouee ureo- urker urkut urour urter uruce urucu urutu uter- utero utro- utror utter uttur uturu ututo uuork uuuuu