bbbb bblb blbt blno blob blon bloo blot blou blub blur blut bnor bnrr bobb bobo bobu boll boln bolo bolt bolu bonn bono bont bonu boob bool boon boor boot bor- born boro borr bort boru botb botn boto bott boul boun bour bout brno brob brol bron broo bror brot brou brrr brun brut btob btor btrt bttb bubb bubo bubu bulb bull bult bulu bunb bunn buno bunt bunu buol buon bur- burb burl burn buro burr burt buru but- buto butt lblr lbrt llll lloo lob- lobb lobo loll lolo lono lonr lont loob lool loon loor loot lorn loro lotl loto lotr lott loul loun lour lout louu lron lrrr ltbl ltnt lttr lull lulu lunn luno lunt lurt nbbo nlrb nnnn nnot nntn nobo nobu noll nolo nolt non- nonn nono nont nonu noo- noob nool noon nooo noor noot nor- norb norn noro norr nort not- noto nott noul noun nour nout nrlb nron nrrl nrtl ntnu ntrl ntru ntto nttr nubl null nunn nuno nunt nuon nurl nurn nurr nurt nuru nutt nutu obbo oblu obol obon obor obot obro olbo ollo olon olor olot oltu olur onno onon onor ont- onto onur onut oolo oont oooo oort ootb orbb orbo orbu orlo orlu orno oro- oron oror orot orro orto orub oto- oton otoo otor otro otto ottu otur oulu oun- our- ourn ouro ourt out- outb outo ouu- rbbb rbbr rnbr rnnt rnot rnut rob- robb robo robt robu roll rolo rolt rono ront roob rool roon roor root roro rort roru rotl rotn roto rotr rott roub roul roun rout rrrr rrun rtlt rubb rubu rull rulo runn runo runt ruro ruru rutl ruto rutt rutu ruun tbrb tlon tnut tobo tobt tobu tol- toll tolo tolt tolu tonb tonn tono tonu tool toon toor toot torn toro torr tort toru toto totr tott toul toun tour tout trno tron troo trot trou trtr trub trun trut truu ttbb tton tttt ttul tubb tubo tubr tubu tull tulo tulu tunb tunn tuno tunu tuor turb turn turo turr turt turu tutl tuto tutt tutu tuuo ubbo ublo ubon ullo ullr ulno ulo- ulto ultt ulul unno unon unro untb unto unut uor- uro- urol uroo urun urur urut utor utto uttu uulu uuno uuuu