ffff ffrr ffun flon floo flor flou fluf fluo flur fnuf fofo foll folo folr fono foof fool foon for- forl forn foro forr foul foun four frol fron frou frun fuff fufu full fulu funf fuor fur- furl furn furo furr llll lloo loff lofn loll lolo lono lonr loof lool loon loor lorn loro loul loun lour louu lron lrrr luff lufu lull lulu lunn luno nfff nfon nnnn nolf noll nolo non- nonn nono nonu noo- nool noon nooo noor nor- norf norn noro norr noul noun nour nron nrrl nuff null nunn nuno nuon nurl nurn nurr nuru off- offo offr offu ofno ofor ollo olof olon olor olur onlf onno onon onor onur ooff oolo oooo orff orfu orlo orlu orno oro- orof oron oror orro ouff oulu oun- our- ourn ouro ouu- rffl roff rofl rofo rolf roll rolo rono roof rool roon roor roro roru rouf roul roun rrrr rrun ruff rufo rull rulo runf runn runo ruro ruru ruun ullo ullr ulno ulo- ulul unlf unno unon unrf unro uofl uofo uor- urff uro- urol uroo urun urur uulu uuno uuuu