ffff ffrr fftf ffun fmno fnuf fofo fomo fomt fono font foof foom foon foot for- form forn foro forr fort fotm foto fott foun four fout frmn from fron frot frou frum frun fuff fufu fumo funf funt fuor fur- furm furn furo furr furt futo futu mfor mfou mftf mmff mmmm mmor mmrf mmun mntn moff mofo mofu momo momu mon- monn mono mont monu moon moor moot morf morn moro mort moru motm moto mott motu mouf moun mour mout mron mrtm mrtn mrtt mtff mtnt mtom mtor mtrr mttr muff mufu mumm mumo mumu munn muno munt munu muon murn muro murr murt muru muto mutt mutu muut nfff nfon nfto nmff nmnt nmon nnmt nnnn nnot nntn nom- nomo nomu non- nonn nono nont nonu noo- noon nooo noor noot nor- norf norm norn noro norr nort not- noto nott noun nour nout nron ntnu ntof ntru nttm ntto nttr nuff numm numt numu nunn nuno nunt nuon nurn nurr nurt nuru nutt nutu off- offo offr offu ofno ofor omn- omo- omon omoo omor omro omuo onno onon onor ont- onto onur onut ooff oont oooo oort orff orfu ormn ormo orno oro- orof orom oron oror orot orro orto orum oto- otof oton otoo otor otro otto ottu otur ouff oun- our- ourn ouro ourt out- outo ouu- rmon rmtu rnnt rnot rnut roff rofo romm romo rono ront roof room roon roor root roro rort roru rotn roto rotr rott rouf roum roun rout rrrr rrum rrun rtfm ruff rufo ruft rumm rumo rumt runf runn runo runt ruro ruru ruto rutt rutu ruun t-mo tfot tmnt tmou tmro tmtt tnut toff tofo toft tofu tomm tomo tomt tonn tono tonu toof toom toon toor toot torf torm torn toro torr tort toru totm toto totr tott toum toun tour tout trfm trfr trmu trno trom tron troo trot trou trtr trun trut truu ttff ttfn tton tttt tuff tufm tufo tuft tufu tumu tunn tuno tunu tuor turf turm turn turo turr turt turu tuto tutt tutu tuum tuuo umff ummo umno umor umut unmr unno unon unrf unro unto unum unut uofm uofo uomo uor- urff urft uro- urom uroo urum urun urur urut utfo utor utto uttu uuno uutf uuuu