bbbb bblb blbt blob bloo blot blou blub blur blut bobb bobo bobu boll bolo bolt bolu boob bool boor boot booz bor- boro borr bort boru borz botb boto bott boul bour bout bozo brob brol broo bror brot brou broz brrr brut bruz btob btor btrt bttb bubb bubo bubu bulb bull bult bulu bulz buol bur- burb burl buro burr burt buru burz but- buto butt butz buuz buzz bzou bzzt bzzz lblr lboz lbrt llll lloo lob- lobb lobo loll lolo lolz loob lool loor loot looz loro lotl loto lotr lott lotz loul lour lout louu lrrr ltbl lttr lull lulu lulz lurt lurz lutz lztt obbo oblu obol obor obot obro olbo ollo olor olot oltu olur oolo oooo oort ootb orbb orbo orbu orlo orlu oro- oror orot oroz orro orto orub orzo orzu oto- otoo otor otro otto ottu otur oulu our- ouro ourt out- outb outo ouu- ouzo ozlu rbbb rbbr rob- robb robo robt robu roll rolo rolt roob rool roor root rooz roro rort roru rotl roto rotr rott roub roul rout rouz rozz rrrr rtlt rubb rubu rull rulo ruro ruru rutl ruto rutt rutu tbrb tobo tobt tobu tol- toll tolo tolt tolu tool toor toot toro torr tort toru toto totr tott toul tour tout tozo troo trot trou trtr trub trut truu ttbb tttt ttul tubb tubo tubr tubu tull tulo tulu tuor turb turo turr turt turu tutl tuto tutt tutu tuuo tuzu tuzz tzur tzut tzzt ubbo ublo ullo ullr ulo- ulto ultt ultz ulul uor- uro- urol uroo urur urut uruz utor utto uttu uulu uuuu uzbl z-ro zlot zobo zoll zolo zoo- zool zoot zorb zoro zort zott zotz zozo zozu zubo zubr zubu zull zulu zulz zuoz zurb zurr zuru zuul zuzu zzzz