bbbb bblb bbrc bcbc bccc bccl bcor bcru bctc bcuc blbt blcu blob bloc bloo blot blou blrc blub blur blut bobb bobo bobu boco bocu boll bolo bolt bolu boob booc bool boor boot bor- boro borr bort boru botb boto bott boul bour bout brcb brob broc brol broo bror brot brou brrr brtc bruc brut btcc btcl btob btor btrc btrt bttb bubb bubo bubu bucc buco bucu bulb bull bult bulu buol bur- burb burl buro burr burt buru but- buto butt c-bo cbbc cbcc cbcl cbcr cbct cbcu cblb cblc cbol cbot cbrl cbrt cbtc cbtl ccbc cccb cccc cccl cccu cclc ccob ccoc ccrc ccrl ccrt cctb cctc cctl cctt ccuc ccut clob cloo clor clot clou clro cltb cltc club clut cobb cobo cobu coco coct cocu col- colb coll colo colt colu coob cool coot cor- corb corc corl coro corr cort cotb cotc coto cott cotu coub coul cour cout crbc crbu crcc crcr crob croc crol croo cror crot crrt crtc crtl crub crut ctol ctor ctot ctrc ctrl cub- cubb cucc culb culc cull culo cult curb curl curo curr curt cut- cutc cuto cutt lbcc lblr lbrt lcbc lccc lcor lcrl lctl lcto llcc lllc llll lloc lloo lob- lobb lobo locc loco locu loll lolo loob looc lool loor loot loro lotl loto lotr lott loul lour lout louu lroc lrrc lrrr ltbl ltcc lttc lttr ltuc lull lulu lurt obbo oblu obol obor obot obro ocbc occc occt oclc ocrl ocro ocrr oct- octo ocul ocur olbo olcc ollo olor olot oltu olur oocr oolo oooo oort ootb orbb orbo orbu orco orlo orlu oro- oror orot orro ortc orto orub otcl oto- otoo otor otro otto ottu otur oucc oulu our- ouro ourt out- outb outo ouu- rbbb rbbr rbcl rcbc rcbo rccb rccc rctc rob- robb robo robt robu rocc roco roll rolo rolt roob rool roor root rorc roro rort roru rotc rotl roto rotr rott roub roul rout rrrr rtcc rtlt rubb rubu ruct rull rulo rurc ruro ruru rutl ruto rutt rutu tbcb tbcc tbrb tccc tccu tctc tcul tlco tobo tobt tobu toco tol- toll tolo tolt tolu tool toor toot torc toro torr tort toru totc toto totr tott toul tour tout trcc trcl troc troo trot trou trtc trtr trub truc trut truu ttbb tttt ttul tubb tubo tubr tubu tucc tuco tull tulo tulu tuor turb turc turo turr turt turu tutl tuto tutt tutu tuuo ubbo ublo uboc ucbc ucrc ucut ulbc ulcc ulco ullo ullr ulo- uloc ulto ultt ulul uocc uolc uor- uro- urol uroo urur urut utor utto uttu uulu uuoc uuuu