bbbb bblb bcbc bccc bccl bctc bcuc blbt blcu blob bloc bloo blot blou blub blut bobb bobo bobu boco bocu boll bolo bolt bolu boob booc bool boot botb boto bott boul bout btcc btcl btob bttb bubb bubo bubu bucc buco bucu bulb bull bult bulu buol but- buto butt c-bo cbbc cbcc cbcl cbct cbcu cblb cblc cbol cbot cbtc cbtl ccbc cccb cccc cccl cccu cclc ccob ccoc cctb cctc cctl cctt ccuc ccut clob cloo clot clou cltb cltc club clut cobb cobo cobu coco coct cocu col- colb coll colo colt colu coob cool coot cotb cotc coto cott cotu coub coul cout ctol ctot cub- cubb cucc culb culc cull culo cult cut- cutc cuto cutt lbcc lcbc lccc lctl lcto llcc lllc llll lloc lloo lob- lobb lobo locc loco locu loll lolo loob looc lool loot lotl loto lott loul lout louu ltbl ltcc lttc ltuc lull lulu obbo oblu obol obot ocbc occc occt oclc oct- octo ocul olbo olcc ollo olot oltu oolo oooo ootb otcl oto- otoo otto ottu oucc oulu out- outb outo ouu- tbcb tbcc tccc tccu tctc tcul tlco tobo tobt tobu toco tol- toll tolo tolt tolu tool toot totc toto tott toul tout ttbb tttt ttul tubb tubo tubu tucc tuco tull tulo tulu tutl tuto tutt tutu tuuo ubbo ublo uboc ucbc ucut ulbc ulcc ulco ullo ulo- uloc ulto ultt ulul uocc uolc utto uttu uulu uuoc uuuu