bbbb bbbs bcbc bcbp bcbs bccc bccs bcpp bcps bcsc bcss bcuc bcup bpcp bpsu bscp bscs bspp bssc bsup bubb bubs bubu bucc bucs bucu bupc bups busc buss busu buus cbbc cbbs cbcc cbcp cbcs cbcu cbpc cbpp cbsc cbus ccbc cccb cccc cccp cccs cccu ccpp ccps ccsp ccss ccuc ccup ccus cpbc cpcs cpcu cpps cpsc cpsu cpus cscb cscc cscs cspb cspc csps csup csus cub- cubb cubs cucc cupp cups cusb cusp cuss cusu pbcc pbsp pcbc pcbs pccc pccs pcpb pcpp pcps ppcc ppcs pppp ppps ppss pscu pspp psps pssc pubs pubu pups pupu puss puuc sbbs sbcc sbcs sbsp sbus sccc sccp sccs scpb scps scsc scsu scub scup spcc spcs spps spsp spss spus sscc sscp sscs sspc ssps sssb sssc ssss sub- subb subs suc- succ sucs sup- supp sups sus- susp suss susu suus ubpc ucbc uccp ucpb ucsb ucsc ucsu upcs uppc uppp uppu upsc upup usbc usbs uscc uscs uspc uspp usps ussb ussc usss ussu usus uucp uuuu