-hou bbbb bhor bhot bhrt bhur bhut bhuu bobb bobo bobu boho bohr boht bohu boko boku boob booh book boor boot bor- borh bork boro borr bort boru botb both boto bott bouh bouk bour bout brkb brob broh brok broo bror brot brou brrr bruh brut btob btor btrt bttb bubb bubo bubu buho buhr bukh bukk buko buku bur- burb burh burk buro burr burt buru but- buto butt hbtu hhhh hkbu hobo hoho hoko hoku hook hoor hoot hork horo horr hort hotb hoth hoto hotr hott hotu houk hour hout hrob hrtb htoh htrk httr hubb hubo huhu huor huot hurk huro hurr hurt huru huth huto hutt hutu huub kbbb kbbk kbbo kbbr kbbt kbbu kbhb kbhh kbhr kbht kbkb kbkk kbko kbkr kbob kbok kboo kbot kbrb kbrh kbrk kbro kbrt kbru kbtb kbtk kbto kbtr kbtt kbub kbuk kbur kbut kbuu khbr khbt khhk khho khkk khkr khob khok khor khot khou khrk khro khrr khrt khtb khth khtk khto khtr khtt khub khuk khur khut kkbb kkbo kkbr kkbt kkhb kkhh kkhk kkhr kkkk kkob kkoh kkoo kkor kkot kkrb kkrh kkrk kkro kkrr kkrt kktk kktu kkut kkuu kobb kobk kobo kobr kobu kohh koho kohr koht kohu kokb kokh kokk koko kokr koku koob kook kooo koor koot koou korb kork koro korr kort koru kotb koth kotk koto kotr kott kotu koub kour kout kouu krbb krbk krbr krbt krkh krkk krko krkr krku krob kroh krok kroo kror krrb krrk krro krrr krrt krth krtk krto krtr kruh kruk krur ktbb ktbr ktbt ktbu kthh kthk ktho kthr ktht kthu ktkb ktkk ktko ktkr ktkt ktku ktob ktoh ktok ktoo ktor ktot ktrb ktrh ktrk ktro ktrr ktrt ktru ktth kttk ktto kttr kttt kttu ktub ktuh kubb kubo kubr kubu kuht kuhu kukh kukk kuku kuok kuoo kurb kurk kuro kurr kurt kuru kuth kuto kutr kutt kutu kuub kuuk kuur kuuu obbo obkb obok obor obot obrh obro obuh ohho ohob ohoh ohok ohto ohtu okko okok okor okot okro okto okur ooho ooku oooh oooo oort ootb orbb orbo orbu orko oro- orok oror orot orro orth orto orub otho othr oto- otoh otok otoo otor otro otto ottu otur our- ouro ourt out- outb outh outo ouu- rbbb rbbr rboh rhob rhoh rob- robb robo robt robu rohr rohu rokh rokk roko rokr roku roob rook roor root rork roro rort roru roth rotk roto rotr rott roub rouh rouk rout rrrr rthk rubb rubu ruhh ruhr rukh rukk ruku ruok ruro ruru ruth ruto rutt rutu tbrb thoo thor thot thou thro thru thtb thtr thuk thur tobo tobt tobu toho tohu toko toku tooh took toor toot tork toro torr tort toru toth toto totr tott touh touk tour tout troo trot trou trtr trub truk trut truu ttbb tttt tubb tubo tubr tubu tuht tuhu tuko tuor turb turk turo turr turt turu tuto tutt tutu tuuo ubbo uhoh uhok uhuh ukko ukok ukur uor- urho uro- urok uroo urrh urth uruk urur urut utor utto uttu uuuu