-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 corex 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 etext etoro etree etter excop excpt exect execx exept exert exopc exopt exore exort exper expro exptr exter extre extro 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 orexo oroco oroer orret orter ortet ortoo otere otero otoce ototo otpor otter oxter p-o-x p-rep pcept pcert pctct pecco peece peere peert peete pepco pepee peppe pept- pepto perce perec perer peret perot perox perre perro perte perto petco peter petr- petre petro pette petto pexec po-po pocop poete pooer poope poopo poore poort poote popco poper popet popex popop poppe poppo porco porec porer poret poro- porro porte porto potco potec potee poter potoc potoo potop potor potpe potro potte potto pppox 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 reorx repco repec repet repop repor repot reppe repro reprt rere- reree reret retee reter retex retop retox retro rette retto rexer ro-ro rocco rocor roero rooer roope roore roote roper roppe rorer roter roto- rotor rotot rotox rotte rotto rprop rptor rtext t-pop t-rex t-top teepe teoco tepco tepee tepet tepor teppo terce terco teret terex teror terre terro tert- teter tetex tetr- tetro tette texor texte tocco toco- toece toerr toeto toore topee toper topet topo- topor topot toppo topto torce toreo toret torpe torpo torre torro torte torto torxe toter totex toto- totoe totoo totop totte toxo- tprot treco treer treet trepp trept trere trete trett troco troee troop trop- trope tropo trott ttttt xero- xerox xerte xetec xetex xexex xootr xorro xotox xoxox xpect xproc xtext xtort xtree