-tree c-cor c-evo c-tec ccccc ccctv ccett ceco- ceere cekov ceoce ceoor cerc- cerce cerco cerec cerer ceret cerke cero- ceroc cerre cerro certe cervo ceto- cette co-co cocc- cocce cocco coceo cocke cockt cocto coete coeve coker coket cokk- cokot cooee cooer cooke cookt coore coote corce core- coree corer corke coro- corot corre corte corto cortv corve corvo coter cott- cotte cotto covek coveo cover covet crece creek creer creke creo- creot crete creve croce crock croco croke crokt crooe crook croot crore crote crott crove ctree cttee cvrce ecker ecorv ecto- ector ectot eecke eeeee eevee eever ekeko ekker ektor ektov eorre erect erere ereve erkec erkko erkoc eroor erore eroto error erte erter eteke etete etoko etoro etree etrek etter eveck evere evero everr evert evete evett eveve evoke evoor evote evtek kecer keere keeve kekec kerek keret kerre kerve ketek keter keto- kette ketto kever ko-ko kocek kocer kocke kocov koker koket kokko kokor kokot kokre korck korec korek korke koror korro korte kortv korve kotev kotor kotov kotto kovor kre-o kreek kreke kreo- krete krock kroke kroot krtok krtov ocker ockro ocoee ocote ocree octet octo- octor oeco- okeke okere oketo okker okoc okoro oo-er oocre ooooo oovoo orcet oreck oreco oreo- orere orero oroco oroer oroke orret orter ortet ortok ortoo orvet otere otero otoce ototo otrok otrov otter ottov oveco over- overo overt ovett r-co- recce recco recet recke rect- recte recto reece reere reeve rekke rere- reree reret retee reter retro rette retto revco rever revet ro-ro rocco rocke rocko rocor rocov roero rokee roker roket rokke rokkk rokot rokto rooer rooke roore roote roove rorer rorke roter rotko roto- rotor rotot rotte rotto rover rt-rk rtrev rttov teeko teket tekke tekko tekov teoco terce terco terek teret terok teror terre terro tert- terve tervo teter tetov tetr- tetro tette tevet tevot tkkev tocco toco- toece toerr toeto toker tokke tokko toko- tokor tooke toore torce toreo toret torke torok torre torro torte torto torve toter toto- totoe totok totoo totte tover tovet treck treco treer treet trere trete trett treve trock troco troee troke trott trove trovo tteok ttttt tvvcr vecer vecke vecov veeck veeco veere veeve vekke vekre verco verek verke verot verre verte verve vetco vette vetto vevce veveo vever voere vokee vokov voore vorce vorke vorre vorte voter votre votto vrock