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