bbbb bbbs bbdd bcbc bcbs bccc bccs bcds bcsc bcss bctc bcts bcuc bdbc bddc bdsd bsbd bscs bssc bssd bsts btcc btcs btdt btss bttb btus bubb bubs bubu bucc bucs bucu budb budd buds budu busc buss bust busu but- buts butt buus c-cd cbbc cbbs cbcc cbcs cbct cbcu cbdb cbdc cbds cbsc cbtc cbus ccbc cccb cccc cccs cccu ccdc ccds ccsd ccss ccst cctb cctc cctt ccuc ccus ccut cdcs cddb cdss cscb cscc cscd cscs csdb cssd cstc cstd csts csus ctbs ctsc ctss ctsu ctts cub- cubb cubs cucc cuds cusb cusd cuss cust cusu cut- cutc cuts cutt dbcc dbcs dbss dbtt dbus dcbc dccb dccc dccs dcct dccu dcdb dcds dcsc dcss dctc dcts dddd ddss ddts ddub dsbc dscc dscs dssc dsst dstc dsts dtcc dtss dub- dubb dubc dubs dubu ducs duct dudd duds dudu dust duts duut sbbs sbcc sbcs sbct sbds sbsd sbst sbtc sbus sccc sccs scct scdc scds scsc scsd scst scsu sctc sctd scts scub scud scut sdcc sddc sdds sdsc sdss sdsu sscc sscs ssdc ssdd sssb sssc ssss sstb sstc sstd ssts stbc stbd stbs stcc stcs stcu stds stss sttc sttd stub stuc stud stus stut sub- subb subd subs suc- succ sucs sudd suds sus- susd suss sust susu sutu suus tbbs tbcb tbcc tbcd tbst tcbs tccc tccu tcdd tctc tcts tddb tdss tsbc tsbd tscc tsdb tsst tstc tsts ttbb ttss tttt tubb tubs tubu tucc tudu tusc tusd tuss tust tuts tutt tutu ubud ucbc ucdc ucdd ucsb ucsc ucsd ucst ucsu ucut udbc udds udsd udts usbc usbs uscc uscs usdc usds usdt ussb ussc usss usst ussu ustb ustc usts usus utsc uttu uuuu