f--k ffff ffrr ffun flok flon floo flor flou fluf fluo flur fnuf fofo folk foll folo folr fono foof fook fool foon for- fork forl forn foro forr foul foun four frol fron frou frun fuff fufu fukk fuko fuku fulk full fulu funf funk fuor fur- furl furn furo furr k-lo kfff kffk kffn kflf kfll kfln kflo kfnf kfnk kfnl kfnn kfno kfok kfon kfoo kfor kfrn kfro kfrr kfru kful kfun kfuo kkfn kkfr kkkk kklf kkll kkln kklo kknn kkno kknu kkol kkon kkoo kkor kkrf kkrk kkrl kkrn kkro kkrr kkuu klff klfn klkk klkl klkn klko klkr kllk klnn klno klok klol klon kloo klor klou klrf klrk klrn klrr klru kluf kluk klun klur kluu knfl knfo knfr knkk knlf knlr knnk knnr knok knol knon knor knou knrk knro knuk knur koff kofk kofo kofu kokf kokk kokn koko kokr koku kolf kolk koll koln kolo kolr kolu konk kono kook kool koon kooo koor koou korf kork korl korn koro korr koru koul kour kouu krff krfn krfo krkk krkn krko krkr krku krlf krln krnk krnn krno krnu krof krok krol kroo kror krrf krrk krrl krrn krro krrr kruf kruk krul krun krur kuff kufn kufo kufr kukk kukl kukn kuku kulf kull kuln kulo kulu kunk kuno kunr kunu kuok kuol kuon kuoo kurk kurl kuro kurr kuru kuuk kuul kuur kuuu llll lloo lnnk loff lofn lokk loko loll lolo lonk lono lonr loof look lool loon loor lork lorn loro louk loul loun lour louu lron lrrr luff lufu luko lull lulu lunk lunn luno lurk luuk nfff nfon nkok nkor nkrf nnnn noko nolf noll nolo non- nonn nono nonu noo- nook nool noon nooo noor nor- norf nork norn noro norr noul noun nour nron nrrl nuff nuku null nunk nunn nuno nuon nurl nurn nurr nuru nuuk off- offo offr offu ofno ofor okko oklo okno okok okol okon okor okro okul okun okur ollo olof olon olor olur onlf onno onon onor onur ooff ooku oolo oooo orff orfu orko orlo orlu orno oro- orof orok oron oror orro ouff oulk oulu oun- our- ourn ouro ouu- rffl rkkf roff rofl rofo rokk roko rokr roku rolf rolk roll rolo ronk rono roof rook rool roon roor rork roro roru rouf rouk roul roun rrrr rrun ruff rufo rukk rukn ruku rulk rull rulo runf runk runn runo ruok ruro ruru ruun ufuk ukko ukok ukon ukur ullo ullr ulno ulo- uluk ulul unkl unkn unko unlf unno unon unrf unro uofl uofo uor- urff uro- urok urol uroo uruk urun urur uulu uuno uuuu