bbbb bbbs bcbc bcbs bccc bccs bcsc bcss bctc bcts bcuc bscs bssc bsts btcc btcs btss bttb btus bubb bubs bubu bucc bucs bucu bucz busc buss bust busu but- buts butt butz buus buuz buzz bzzt bzzz cbbc cbbs cbcc cbcs cbct cbcu cbsc cbtc cbus ccbc cccb cccc cccs cccu ccss ccst cctb cctc cctt ccuc ccus ccut cscb cscc cscs cstc csts csus ctbs ctsc ctss ctsu ctts cub- cubb cubs cucc cusb cuss cust cusu cut- cutc cuts cutt czts sbbs sbcc sbcs sbct sbst sbtc sbus sccc sccs scct scsc scst scsu sctc scts scub scut sscc sscs sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stcu stss sttc stub stuc stus stut sub- subb subs subz suc- succ sucs sus- suss sust susu susz sutu suus suzu suzz szss szuc tbbs tbcb tbcc tbst tcbs tccc tccu tctc tcts tsbc tscc tsst tstc tsts ttbb ttss tttt tubb tubs tubu tucc tusc tuss tust tuts tutt tutu tuzu tuzz tzus tzut tzzt ucbc ucsb ucsc ucst ucsu ucut usbc usbs uscc uscs ussb ussc usss usst ussu ustb ustc usts usus utsc uttu uuuu zbus zctu zsss ztst zubu zust zuzu zzzs zzzz