aaaa aaab aaac aaap aaar aaas aaba aabb aabc aabp aaca aacb aacc aacp aacr aacs aapa aapc aaps aara aarc aarp aars aasa aasc aass abaa abab abac abap abar abas abb- abba abbb abbr abbs abca abcb abcc abcp abcr abcs abpa abpc abpp abpr abps abra abrc abrs abs- absa absp abss acaa acab acac acap acar acas acba acca accc accp accs acpa acpr acps acr- acra acrc acrr acrs acsa acsc acss apac apap apar apas apba apbr apbs apca apcb apcc apcr apcs appa appc appr apps apra aprc aprs apsa apss arab arac arap arar aras arba arbs arc- arca arcs arpa arps arr- arra arrc arrr arrs ars- arsa arsc asaa asab asac asap asar asas asba asc- asca ascb ascc ascp ascr aspa aspc aspr asps asra asrc asrs assa assc assp assr asss baaa baar baas baba babb babr babs bac- baca bacc bacs bapa bapc bapp baps bar- bara barb barc barr bars basa basc bass bbas bbbb bbbs bbpr bbrc bcaa bcap bcar bcas bcbc bcbp bcbs bcca bccc bccs bcpp bcps bcra bcrs bcsa bcsc bcss bpcp bprc bpsa brab brac bras brca brcb brrr brrs brsb brsr bsaa bsac bsap bsas bscp bscs bspp bspr bsra bssc caaa caab caac caap caas caba cabs cac- caca cacc cacr capa capb capc capp caps cara carb carc carp carr cars casa casb casc casp casr cass cbac cbar cbbc cbbs cbca cbcc cbcp cbcr cbcs cbpc cbpp cbsa cbsc ccaa ccab ccac ccap ccar ccas ccba ccbc ccca cccb cccc cccp cccs ccpa ccpp ccpr ccps ccra ccrc ccrp ccrs ccsa ccsp ccss cpaa cpac cpap cpas cpbc cpca cpcs cppa cpps cprs cpsa cpsc cpsr crab crac crap crar cras crbc crca crcc crcr crpc crps crsa crsp crss csaa csab csac csar csas cscb cscc cscr cscs cspa cspb cspc csps csra csrc csrs cssa cssr paap paar paas paba paca pacs papa papb papp papr paps par- para parc parp parr pars pasa pasc pasp pass pbac pbar pbcc pbpa pbrs pbsa pbsp pcaa pcap pcas pcba pcbc pcbs pcca pccc pccs pcpb pcpp pcps pcra pcrc pcsa ppac ppap ppar ppcc ppcs pppa pppp ppps pprc ppss prar pras prbc prbs prca prcc prcp prcs prps prrs prsa prsc prss psac psap psas psbr psca pspp pspr psps psrp pssa pssc raab raas raba rabb rabs rac- raca racc racs rapa rapc rapp raps rara rarb rars rasa rasc rasp rass rbbb rbbr rbbs rbsp rbss rcac rcas rcbc rccb rccc rccs rcps rcsa rcsc rcss rpca rpcs rpps rras rrrr rrsp rsaa rscc rscs rspb rsps rssa sa-c saab saac saap saar saas saba sabb sabc sabr sabs saca sacc sacr sacs sapa sapp saps sara sarc sarp sarr sars sasa sasc sass sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbsa sbsp scaa scab scac scap scar scas scba sccc sccp sccs scpa scpb scps scr- scra scrc scrs scsa scsc scsr sp-a spac spap spar spas spca spcc spcs spps sprs spsa spsp spss sras srbc srcc srpc srps srsp ssaa ssab ssac ssap ssas ssbr ssca sscc sscp sscs sspa sspc ssps ssra ssrc ssrs sssa sssb sssc ssss