-hou bbbb bhor bhur bhuu bnor bnrr bobb bobo bobu bohn boho bohr bohu bonn bono bonu boob booh boon boor bor- borh born boro borr boru bouh boun bour bovo brno brob broh bron broo bror brou brrr bruh brun bruv bubb bubo bubu buho buhr bunb bunn buno bunu buon bur- burb burh burn buro burr buru hhhh hobo hohn hoho hono honu hoon hoor horn horo horr hour hrob hron hrun hubb hubo huhn huhu hunh huon huor hurn huro hurr huru huub nbbo nhnn nhon nnnn nobo nobu nohn noho non- nonn nono nonu noo- noob noon nooo noor noov nor- norb norn noro norr norv nouh noun nour nov- novo nron nunn nuno nuon nurn nurr nuru nurv nuvo obbo obon obor obrh obro obuh ohho ohno ohob ohoh ohrn onno onon onor onur ooho oooh oooo orbb orbo orbu orno oro- oron oror orro orub orvr oun- our- ourn ouro ouu- ovo- ovon ovoo rbbb rbbr rboh rhob rhoh rhon rhun rnbr rob- robb robo robu rohn rohr rohu rono roob roon roor roro roru roub rouh roun rovo rrrr rrun rubb rubu ruhh ruhn ruhr runn runo ruro ruru ruun ruvu rvvh ubbo ubon uhno uhoh uhuh unno unon unov unro uor- uovo urho uro- uroo urrh urun urur uuno uuuu uv-b uvvu vhhh voho vohu vonn voor vor- voro voru vouh voun vour vrnn vron vuno vurb vvob vvvv