ffff ffrr ffun fmno fnuf fofo fomo fono foof foom foon for- form forn foro forr foun four frmn from fron frou frum frun fuff fufu fumo funf fuor fur- furm furn furo furr mfor mfou mmff mmmm mmor mmrf mmun moff mofo mofu momo momu mon- monn mono monu moon moor morf morn moro moru mouf moun mour mron muff mufu mumm mumo mumu munn muno munu muon murn muro murr muru nfff nfon nmff nmon nnnn nom- nomo nomu non- nonn nono nonu noo- noon nooo noor nor- norf norm norn noro norr noun nour nron nuff numm numu nunn nuno nuon nurn nurr nuru off- offo offr offu ofno ofor omn- omo- omon omoo omor omro omuo onno onon onor onur ooff oooo orff orfu ormn ormo orno oro- orof orom oron oror orro orum ouff oun- our- ourn ouro ouu- rmon roff rofo romm romo rono roof room roon roor roro roru rouf roum roun rrrr rrum rrun ruff rufo rumm rumo runf runn runo ruro ruru ruun umff ummo umno umor unmr unno unon unrf unro unum uofm uofo uomo uor- urff uro- urom uroo urum urun urur uuno uuuu