a-ak aaaa aaab aaac aaap aaas aaba aabb aabc aabp aaca aacb aacc aack aacp aacs aaka aapa aapc aaps aasa aasc aass abaa abab abac abak abap abas abb- abba abbb abbs abca abcb abcc abcp abcs abpa abpc abpp abps abs- absa absp abss acaa acab acac acap acas acba acca accc accp accs acks acpa acps acsa acsc acss akaa akap akas akca akka aksa apac apak apap apas apba apbs apca apcb apcc apcs appa appc apps apsa apss asaa asab asac asak asap asas asba asc- asca ascb ascc ascp aska asks aspa aspc asps assa assc assk assp asss baaa baak baas baba babb babs bac- baca bacc back bacs bak- baka baks bapa bapc bapp baps basa basc bask bass bbas bbbb bbbs bcaa bcap bcas bcbc bcbp bcbs bcca bccc bccs bcpp bcps bcsa bcsc bcss bksp bpcp bpsa bsaa bsac bsap bsas bscp bscs bspp bssc caaa caab caac caap caas caba cabs cac- caca cacc cack caka capa capb capc capp caps casa casb casc cask casp cass cbac cbbc cbbs cbca cbcc cbcp cbcs cbka cbpc cbpp cbsa cbsc ccaa ccab ccac ccap ccas ccba ccbc ccca cccb cccc cccp cccs ccpa ccpp ccps ccsa ccsp ccss ckac ckbc ckck ckcs ckpc cksa cksb cpaa cpac cpap cpas cpbc cpca cpcs cppa cpps cpsa cpsc cpsk csaa csab csac csak csas cscb cscc cscs cska csks cspa cspb cspc csps cssa kaaa kaab kaak kaap kaas kaba kabb kabc kacb kacc kacp kacs kaka kakc kakk kaks kap- kapa kapc kapp kaps kas- kasa kasb kasc kask kasp kass kbaa kbab kbac kbak kbap kbas kbba kbbb kbbc kbbk kbbs kbca kbcb kbck kbcs kbkb kbkk kbpa kbpc kbpk kbps kbsa kbsb kbsk kbss kcaa kcab kcac kcap kcas kcba kcbc kcbk kcbs kcca kccb kccc kcck kckc kckk kcpa kcpc kcps kcsa kcsb kcsc kcsp kcss kkaa kkac kkap kkba kkbb kkbs kkcb kkck kkcs kkkk kkpc kkpk kkps kksa kksp kkss kpac kpak kpas kpba kpbb kpbs kpcc kpcs kpkk kppc kppk kppp kpsc kpsp ksab ksac ksak ksas ksba ksbc ksbp ksbs ksca kscb ksck kscs kska kskb kskk ksks kspa kspb kspc kspk ksps kssa ksss paak paap paas paba paca pack pacs paka paks papa papb papp paps pasa pasc pask pasp pass pbac pbcc pbpa pbpk pbsa pbsp pcaa pcap pcas pcba pcbc pcbs pcca pccc pccs pcks pcpb pcpp pcps pcsa pkcs ppac ppap ppcc ppcs pppa pppp ppps ppss psac psap psas psca pspp psps pssa pssc sa-c saab saac saak saap saas saba sabb sabc sabs saca sacc sack sacs saka sakb sakk saks sapa sapp saps sasa sasc sask sass sbaa sbac sbas sbbs sbca sbcc sbcs sbsa sbsp scaa scab scac scak scap scas scba sccc sccp sccs sck- scpa scpb scps scsa scsc skab skac skap skpc skss sp-a spac spak spap spas spca spcc spcs spps spsa spsp spss ssaa ssab ssac ssap ssas ssca sscc sscp sscs sspa sspc ssps sssa sssb sssc ssss