-er eee eef eek eeo eep eer ef- efe eff efo efp efr eke ekf eko ekp ekr eo- eoe eof eok eoo eop eor ep- epe epf epo epp epr ere erf erk ero erp err fee fef fek feo fep fer ffe fff ffk ffo ffp ffr fkf fkk fkp foe fof fok foo fop for fpe fpk fpo fpp fpr fre frf frk fro frp frr ke- kee kef kek keo kep ker kff kfo kke kkk kkp kkr koe kof kok koo kop kor kpe kpf kpk kpo kpp kpr krf krk kro krp krr oee oef oeo oep oer of- ofe off ofo ofp ofr oke okk oko okp okr oo- oof ook ooo oop oor op- ope opf opk opo opp opr or- ore orf ork oro orp orr p-p pee pef pek peo pep per pfe pff pfk pfo pfp pfr pke pkf pko pkp pkr poe pof pok poo pop por ppe ppf ppk ppo ppp ppr pre prf prk pro prp prr re- ree ref rek reo rep rer rfe rff rfk rfo rfp rfr rke rkf rkk rko rkp roe rof rok roo rop ror rpe rpf rpk rpo rpp rpr rrf rrk rrp rrr

eeee eefe eeke eero efeo efke efor ekek eker ekpe ekpo eore epee eper epor eppo eppp epro eprp erer erke eroe eroo erpe erre erro f--k feek feer fefe feff fefo feke feko feof fere ferk fero ferr ffee ffff ffrr foer fofo foke foof fook fopp for- fore fork foro forr fprf free freo frep froe frop keef keek keep keer keff kefr keke keko keok kep- kepe ker- kere kerf kerk kero kerp kerr kfer kfff kffk kfok kfoo kfor kfpr kfre kfro kfrp kfrr kkfr kkkk kkoo kkor kkpk kkre kkrf kkrk kkro kkrr kofe koff kofk kofo kofp koke kokf kokk koko kokp kokr kook kooo koop koor kope kopf kopp kopr kore korf kork koro korr kpek kper kpfk kpfr kpke kpkk kpkr kpoe kpof kpok kpoo kpop kppk kppo kppp kppr kpre kprf kprk kpro kprp kprr kree kref krek kreo krfe krff krfo krfp krke krkk krko krkr kroe krof krok kroo krop kror krpr krre krrf krrk krro krrr o-eo oere ofek ofer off- offe offo offr ofor ofre oker okko okok okor okpe okpo okre okro ooer ooff oooo oore opep oper opo- opor oppo ore- orek oreo orer orfe orff orke orko oro- oroe orof orok oror orpe orro peek peep peer peff peke pekk peko peor pepe pepo per- pere perf perk pero perp perr pfff pffr pfkp poer poff poke poko poof pook poop poor pop- pope popo popp pore pork poro porr pper pppo pppp pprf pre- pree pref prek prep pro- proe prof proo prop reef reek reep refe reff refr reke reko reof reop repe repo repp repr rere rero rfef rkkf roer rofe roff rofo roke rokk roko rokr roof rook roop roor rope ropo rore rork roro rpoe rpof rrrr

e-pro eeeee eepee efere effer efore ekeko ekker eofor eorre erere erkko eroor erore error feeor feere fefor feoff ferr- ferre ferro fokke foore fore- foreo forro freek freep freer freke frere froop frore k-p-r k-pop keefe keepe keere kefee keppe kerek kerep kerre ko-ko koepp koker kokko kokor kokre kopek koper kopff koppe korek korff korke korop koror korpe korpo korro kre-o kreef kreek kreep kreke kreo- krepe kroke kropp o-fer oeppo offek offer offof offre ofpop okeke okere okker okoro oo-er ooooo opepe opere opper oreo- orere orero orfeo orfoe orfor oroer oroke p-rep peeke peere pefko pekoe pekre pepee peppe perer perke perko perre perro pforp po-po poker pooer pooke poope poopo poore poork popek poper popop poppe poppo porer porke poro- porro pre-k preef preff preke preko preok preop proer profe proff proke proof proor prop- prope propp propr prore reefe reepe reere refer reffe reffo rekke repok repop repor reppe repro rere- reree ro-ro roero roffe rofor rokee roker rokke rokkk rooer roofe rooke roope roore roper roppe rorer rorke rperf rprop

effere effoff effore ekero epopee feeror feofor ferfer feroke ferrer ferro- foerre fokker foofoo fooker fopper forker forrer freeof freepr frefre froofe keefer keeffe keeker keeper keokee kepper kerker koffee kokopo kokoro kokpek kookoo koopoo kopeek koreke korere korero korkor kororo korrek kreker kreope krokek oferre ofpoor okeefe okerer okopek okpofe okpoko ookroo oooooo orpeko peeker peepee peeper peerer peffer pepero pepkor pepper perere peroff peroke peroor perore perper perree poffer pokerf pookoo pooper poopoo poorer popfor popoff popopo poporo popper poppop porker ppoker pppppp pre-op prefer preffe preore profer proffe profor profre proker prokke prokop proper propre reefer reeffe reeker reekof reeper refeff repope repper repref reroof roeper roepke rokker rokkor roofer rooker roopee roopek rooper rorek

eeeroer errorof feoffee feoffer feoffor ferrere ferrero foo-foo forfere forfree freefor freeppp kee-kee keepoff kor-kor korkoro korokke kreeker kropfer off-off offeree offerer offeror ofproof okeeffe okpekpe orepeer pee-pee peperek perekop perrero perrore pfeffer poo-poo pop-off porpere porpore preferr preffer prefork prepere prepper proffer proffre proofer proofre propero propper refeoff referee referer reoffer repreef reprefe reproof rerefer roorkee ropeoff

feeoffee forereef keeperof koekkoek kroepoek orerokpe peeppeep pepeekeo pepperer peroffer perperek perrerer poorpoor poroporo preferee preferer preoffer properer referree referrer reproffe

errorfree keek-keek orekeeper poee-poee preferree preferrer profferer repe-refe reproffer

errorproof proreferee

proof-proof