-tree c-cor c-tec ccccc ccett ceco- ceere cegge ceoce ceoor cerc- cerce cerco cerec cerer ceret cerge cero- ceroc cerre cerro certe ceto- cette co-co cocc- cocce cocco coceo cocto coete cooee cooer coore coorg coote corce core- coree corer corge coro- corot corre corte corto coter cott- cotte cotto crece creer cregg creo- creot crete croce croco crooe croot crore crote crott ctree cttee ecto- ector ectot eeeee egger egret eorre erceg erect erege erere ergo- ergot eroge eroor erore eroto error erte erter etete etoro etree etrog etter gecco geere geert geete gegge georg gerce gerre gertt getco getee geter getgo gette getto go-go go-oo go-to gocco gocoo goget gogro googe goore goote gorce goree gorer gorge gorgo gorre goter gotoo gotor gotto grece greco greer greet grege gregg grego greot grete grett groce groet groge grogg groot grote grott grrrr gtrot ocoee ocote ocree octet octo- octor oeco- ogogo oo-er oocre ooooo orcet oreco oreo- orere orero oroco oroer orret orrgo orter ortet ortoo otego otere otero otoce ototo otter r-co- recce recco recet recog rect- recte recto reece reege reere regec reger reget regge reggo regtt reorg rere- reree reret retee reter retgo retrg retro rette retto ro-ro rocco rocor roero roger roget rogge rooer rooge roore roote rorer roter rotge roto- rotor rotot rotte rotto teege tegre teoco terce terco teret terge tergo teror terre terro tert- teter tetr- tetro tette to-go tocco toco- toece toego toerr toeto toget togge toore torce toreo toret torgo torog torre torro torte torto toter toto- totoe totoo totte treco treer treet treg- trego trere trete trett troco troee trott ttttt