f--k ffff ffrr fofo fono foof fook foon for- fork forn foro forr fron kfff kffk kffn kfnf kfnk kfnn kfno kfok kfon kfoo kfor kfrn kfro kfrr kkfn kkfr kkkk kknn kkno kkon kkoo kkor kkrf kkrk kkrn kkro kkrr knfo knfr knkk knnk knnr knok knon knor knrk knro koff kofk kofo kokf kokk kokn koko kokr konk kono kook koon kooo koor korf kork korn koro korr krff krfn krfo krkk krkn krko krkr krnk krnn krno krof krok kroo kror krrf krrk krrn krro krrr nfff nfon nkok nkor nkrf nnnn noko non- nonn nono noo- nook noon nooo noor nor- norf nork norn noro norr nron off- offo offr ofno ofor okko okno okok okon okor okro onno onon onor ooff oooo orff orko orno oro- orof orok oron oror orro rkkf roff rofo rokk roko rokr ronk rono roof rook roon roor rork roro rrrr