bbbb bobb bobo bobu boko boku boob book boor boot booz bor- bork boro borr bort boru borz botb boto bott bouk bour bout bozo brkb brob brok broo bror brot brou broz brrr brut bruz btob btor btrt bttb bubb bubo bubu bukk buko buku bur- burb burk buro burr burt buru burz but- buto butt butz buuz buzz bzou bzrk bzzt bzzz kbbb kbbk kbbo kbbr kbbt kbbu kbbz kbkb kbkk kbko kbkr kbkz kbob kbok kboo kbot kboz kbrb kbrk kbro kbrt kbru kbrz kbtb kbtk kbto kbtr kbtt kbtz kbub kbuk kbur kbut kbuu kbuz kbzo kbzt kbzu kbzz kkbb kkbo kkbr kkbt kkbz kkkk kkob kkoo kkor kkot kkoz kkrb kkrk kkro kkrr kkrt kkrz kktk kktu kktz kkut kkuu kkzu kkzz kobb kobk kobo kobr kobu kokb kokk koko kokr koku kokz koob kook kooo koor koot koou kooz korb kork koro korr kort koru kotb kotk koto kotr kott kotu kotz koub kour kout kouu kozb kozk kozo kozr kozt kozu krbb krbk krbr krbt krbz krkk krko krkr krku krkz krob krok kroo kror kroz krrb krrk krro krrr krrt krrz krtk krto krtr krtz kruk krur kruz krzk krzr krzz ktbb ktbr ktbt ktbu ktbz ktkb ktkk ktko ktkr ktkt ktku ktkz ktob ktok ktoo ktor ktot ktrb ktrk ktro ktrr ktrt ktru ktrz kttk ktto kttr kttt kttu kttz ktub ktuz ktzk ktzo ktzr ktzt ktzu ktzz kubb kubo kubr kubu kukk kuku kuok kuoo kurb kurk kuro kurr kurt kuru kurz kuto kutr kutt kutu kutz kuub kuuk kuur kuuu kuuz kuzu kuzz kzbb kzbk kzbr kzbt kzbz kzkr kzkz kzoo kzor kzot kzoz kzrb kzrk kzro kzrr kzrz kztb kztk kzuu kzuz kzzb kzzk kzzo kzzr kzzt kzzz obbo obkb obok obor obot obro okko okok okor okot okro okto okur ooku oooo oort ootb orbb orbo orbu orko oro- orok oror orot oroz orro orto orub orzk orzo orzu oto- otok otoo otor otro otto ottu otur our- ouro ourt out- outb outo ouu- ouzo rbbb rbbr rob- robb robo robt robu rokk roko rokr roku roob rook roor root rooz rork roro rort roru rotk roto rotr rott roub rouk rout rouz rozz rrrr rubb rubu rukk ruku ruok ruro ruru ruto rutt rutu tbrb tobo tobt tobu toko toku took toor toot tork toro torr tort toru toto totr tott touk tour tout tozo troo trot trou trtr trub truk trut truu ttbb tttt tubb tubo tubr tubu tuko tuor turb turk turo turr turt turu tuto tutt tutu tuuo tuzk tuzu tuzz tzuk tzur tzut tzzt ubbo ukko ukok ukur uor- uro- urok uroo uruk urur urut uruz utor utto uttu uuuu z-ro zobo zoku zoo- zook zoot zorb zork zoro zort zott zotz zouk zozo zozu zubo zubr zubu zuko zukr zuoz zurb zurr zuru zuuk zuzu zzzz