bbbb bbfn bnor bnrr bobb bobo bobu boff bofu bomb bomu bonn bono bonu boob boof boom boon boor bor- borf borm born boro borr boru bouf boum boun bour brfm brfu brno brob brom bron broo bror brou brrm brrr brum brun bubb bubo bubu buff bufo bufr bum- bumb bumf bunb bunn buno bunu buon bur- burb burm burn buro burr buru fbom ffff ffrr ffun fmno fnuf fofo fomo fono foof foom foon for- forb form forn foro forr foun four frmn frob from fron frou frub frum frun fubb fubu fuff fufu fumo funf fuor fur- furm furn furo furr mbou mfbm mfor mfou mmff mmmm mmor mmrf mmun mnbb mobb mobo moff mofo mofu momo momu mon- monn mono monu moob moon moor morb morf morn moro moru mouf moun mour mrbb mrbm mron mubo muff mufu mumm mumo mumu munn muno munu muon murn muro murr muru nbbo nbuf nfff nfon nmff nmon nnnn nobm nobo nobu nom- nomo nomu non- nonn nono nonu noo- noob noon nooo noor nor- norb norf norm norn noro norr noun nour nron nuff numb numm numu nunn nuno nuon nurn nurr nuru obbo obon obor obro off- offo offr offu ofno ofor ombo ombu omn- omo- omon omoo omor omro omuo onno onon onor onur ooff oooo orbb orbo orbu orff orfu ormn ormo orno oro- orof orom oron oror orro orub orum ouff oun- our- ourn ouro ouu- rbbb rbbr rmon rnbr rob- robb robo robu roff rofo romb romm romo rono roob roof room roon roor roro roru roub rouf roum roun rrrr rrum rrun rubb rubu ruff rufo rumb rumm rumo runf runn runo ruro ruru ruun ubbo ubon umb- umbo umff ummo umno umor unmr unno unon unrf unro unum uofm uofo uomo uor- urff uro- urom uroo urum urun urur uuno uuuu