-tree c-cor c-p-c c-pop c-tec ccccc ccett ceco- ceere cefor 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 cofer coffe cofre cooee cooer coope coopt coore coote copce copec coper coppe coppo copr- copre copro copte copto corce core- coree corer corfe corfo coro- corop corot corpe corre corte corto coter cott- cotte cotto cpcfc cpctc crece creep creer creft creo- creop creot crepe crept crete croce croco croft crooe croop croot cropc crope cropo crore crote crott cteep ctree cttee e-pro ecoff ecorp ectfe ecto- ector ectot eeeee eepee efere efetf effer effet efore efter eofor eorre epcot eperc epopt epote eptfe erect erept erere eroor erore eroto error erte erter etete etoro etree etter feeor feere fefor feoff ferce feret ferr- ferre ferro ferte feter feto- fetor fette focer foore foote force fore- foreo foret forro forte forto fotte fprot frcpc freep freer freet frere frett froop froot frore frote ftrtt o-fer ocftc ocoee ocote ocree octet octo- octor oeco- oeppo offer offof offre offto ofoto ofpop ofter oo-er oocre ooooo opepe opere opper opter opto- optot optto orcet orcop oreco oreo- orere orero orfeo orfoe orfor 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 pforp 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 potof potoo potop potor potpe potro potte potto prece preco preef preff preop prete preto proer profe proff proft proof proor proot prop- prope propp propr propt prore prot- proto prtor pter- ptere ptero ptprc ptpre ptprf ptpro ptprr ptprt r-co- recce recco recep recet recpt rect- recte recto reece reefe reeft reepe reere refco refer refet reffe reffo repco repec repet repop repor repot reppe repro reprt rere- reree reret retee reter retop retro rette retto ro-ro rocco rocor roero roffe rofor rooer roofe rooft roope roore roote roper roppe rorer roter roto- rotor rotot rotte rotto rperf rprop rptor t-pop t-top teepe tefe teoco tepco tepee tepet tepor teppo terce terco teret teror terre terro tert- teter tetr- tetro tette tocco toco- toece toeof toerr toeto tofet toffo tofop tofor tofte toore topee toper topet topo- topof topor topot toppo topto torce toreo toret torpe torpo torre torro torte torto toter toto- totoe totoo totop totte tprot treco treer treet trefe treff trepp trept trere trete trett troco troee trofe troff troft troop trop- trope tropo trott ttttt