bbbb bbbs bbfc bcbc bcbs bccc bccs bcfc bcsc bcss bcuc bfcs bffs bscs bsfc bsff bsfs bssc bubb bubs bubu bucc bucs bucu bufc buff busc buss busu buus cbbc cbbs cbcc cbcs cbcu cbfb cbfc cbsc cbus ccbc cccb cccc cccf cccs cccu ccfc ccff ccsf ccss ccuc ccus cfbc cfbs cfcb cfcf cfcs cffb csbf cscb cscc cscf cscs csfc csuf csus cub- cubb cubs cucc cufc cuff cusb cuss cusu fbus fcbs fccf fcsc ffcc ffff ffss fscb fscc fssc fssf fubb fubs fubu fuc- fufc fuff fufu fusc fuss fusu sbbs sbcc sbcs sbfc sbus sccc sccs scfc scsc scsu scub sfbc sfcc sfcs sffc sfss sfsu sscc sscs ssfc sssb sssc sssf ssss sub- subb subs suc- succ sucs suf- sufc suff sufs sufu sus- suss susu suus ucbc ucfb ucsb ucsc ucsf ucsu ufcu usbc usbs uscc uscf uscs usfc usfs ussb ussc ussf usss ussu usus uuuu