-tree c-cor c-p-c c-pop c-tec ccccc ccett ceco- ceere ceoce ceoor cepet cepot ceppo cerc- cerce cerco cerec cerer ceret cero- ceroc cerre cerro certe ceto- cette co-co co-op cocc- cocce cocco coceo cocto coepe coete cooee cooer coope coopt coore coote copce copec coper coppe coppo copr- copre copro copte copto corce core- coree corer coro- corop corot corpe corre corte corto coter cott- cotte cotto cpctc crece creep creer creo- creop creot crepe crept crete croce croco crooe croop croot cropc crope cropo crore crote crott cteep ctree cttee e-pro ecorp ecto- ector ectot eeeee eepee eorre epcot eperc epopt epote erect erept erere eroor erore eroto error erte erter etete etoro etree etter ocoee ocote ocree octet octo- octor oeco- oeppo oo-er oocre ooooo opepe opere opper opter opto- optot optto orcet orcop oreco oreo- orere orero oroco oroer orret orter ortet ortoo otere otero otoce ototo otpor otter p-rep pcept pcert pctct pecco peece peere peert peete pepco pepee peppe pept- pepto perce perec perer peret perot perre perro perte perto petco peter petr- petre petro pette petto po-po pocop poete pooer poope poopo poore poort poote popco poper popet popop poppe poppo porco porec porer poret poro- porro porte porto potco potec potee poter potoc potoo potop potor potpe potro potte potto prece preco preop prete preto proer proor proot prop- prope propp propr propt prore prot- proto prtor pter- ptere ptero ptprc ptpre ptpro ptprr ptprt r-co- recce recco recep recet recpt rect- recte recto reece reepe reere repco repec repet repop repor repot reppe repro reprt rere- reree reret retee reter retop retro rette retto ro-ro rocco rocor roero rooer roope roore roote roper roppe rorer roter roto- rotor rotot rotte rotto rprop rptor t-pop t-top teepe teoco tepco tepee tepet tepor teppo terce terco teret teror terre terro tert- teter tetr- tetro tette tocco toco- toece toerr toeto toore topee toper topet topo- topor topot toppo topto torce toreo toret torpe torpo torre torro torte torto toter toto- totoe totoo totop totte tprot treco treer treet trepp trept trere trete trett troco troee troop trop- trope tropo trott ttttt