-hou bbbb bblb bhor bhur bhuu blno blob blon bloo blou blub blur bnor bnrr bobb bobo bobu bohl bohn boho bohr bohu boll boln bolo bolu bonn bono bonu boob booh bool boon boor bor- borh born boro borr boru bouh boul boun bour brno brob broh brol bron broo bror brou brrr bruh brun bubb bubo bubu buhl buho buhr bulb bull bulu bunb bunn buno bunu buol buon bur- burb burh burl burn buro burr buru hhhh hlul hobo hohl hohn hoho hol- holb holh holl holn holo holu hono honu hool hoon hoor horl horn horo horr hour hrbl hrob hron hrun hubb hubl hubo huhn huhu hull hulu hunh huon huor hurl hurn huro hurr huru huub lblr lhhh lhor lhun llll lloo lob- lobb lobh lobo lohn loho lohr lohu loll lolo lono lonr loob lool loon loor lorn loro louh loul loun lour louu lron lrrr luhu lull lulu lunn luno luoh nbbo nhhl nhnn nhon nlrb nnnn nobo nobu nohn noho noll nolo non- nonn nono nonu noo- noob nool noon nooo noor nor- norb norn noro norr nouh noul noun nour nrlb nron nrrl nubl null nunn nuno nuon nurl nurn nurr nuru obbo oblu obol obon obor obrh obro obuh ohho ohno ohob ohoh ohrn olbo ollo olon olor olur onno onon onor onur ooho oolo oooh oooo orbb orbo orbu orlo orlu orno oro- oron oror orro orub oulu oun- our- ourn ouro ouu- rbbb rbbr rboh rhob rhoh rhon rhun rnbr rnhl rob- robb robo robu rohl rohn rohr rohu roll rolo rono roob rool roon roor roro roru roub rouh roul roun rrrr rrun rubb rubu ruhh ruhl ruhn ruhr rull rulo runn runo ruro ruru ruun ubbo ublo ubon uhno uhoh uhuh ullo ullr ulno ulo- ulul unno unon unro uor- urho uro- urol uroo urrh urun urur uulu uuno uuuu