a-ak aaaa aaab aaac aaap aaar aaas aaba aabb aabc aabp aaca aacb aacc aack aacp aacr aacs aaka aapa aapc aaps aara aarc aarp aars aasa aasc aass abaa abab abac abak 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 acks acpa acpr acps acr- acra acrc acrr acrs acsa acsc acss akaa akap akar akas akca akka akr- akra aksa apac apak apap apar apas apba apbr apbs apca apcb apcc apcr apcs appa appc appr apps apra aprc aprs apsa apss arab arac arak arap arar aras arba arbs arc- arca arcs arka arks arpa arps arr- arra arrc arrk arrr arrs ars- arsa arsc arsk asaa asab asac asak asap asar asas asba asc- asca ascb ascc ascp ascr aska askr asks aspa aspc aspr asps asra asrc asrs assa assc assk assp assr asss baaa baak baar baas baba babb babr babs bac- baca bacc back bacs bak- baka bakr baks bapa bapc bapp baps bar- bara barb barc bark barr bars basa basc bask bass bbas bbbb bbbs bbpr bbrc bcaa bcap bcar bcas bcbc bcbp bcbs bcca bccc bccs bcpp bcps bcra bcrs bcsa bcsc bcss bkpr bksp bpcp bprc bpsa brab brac brak bras brca brcb brka brkb brrr brrs brsb brsr bsaa bsac bsap bsas bscp bscs bspp bspr bsra bssc caaa caab caac caap caas caba cabs cac- caca cacc cack cacr caka capa capb capc capp caps cara carb carc cark carp carr cars casa casb casc cask casp casr cass cbac cbar cbbc cbbs cbca cbcc cbcp cbcr cbcs cbka cbkr 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 ckac ckbc ckck ckcs ckpc ckpr ckrc cksa cksb cpaa cpac cpap cpas cpbc cpca cpcs cppa cpps cprs cpsa cpsc cpsk cpsr crab crac crap crar cras crbc crca crcc crcr crkc crkp crpc crps crsa crsp crss csaa csab csac csak csar csas cscb cscc cscr cscs cska csks cspa cspb cspc csps csra csrc csrs cssa cssr kaaa kaab kaak kaap kaar kaas kaba kabb kabc kabr kacb kacc kacp kacs kaka kakc kakk kaks kap- kapa kapc kapp kaps kara karb kark karp karr kars kas- kasa kasb kasc kask kasp kasr kass kbaa kbab kbac kbak kbap kbar kbas kbba kbbb kbbc kbbk kbbr kbbs kbca kbcb kbck kbcr kbcs kbkb kbkk kbkr kbpa kbpc kbpk kbpr kbps kbra kbrb kbrc kbrk kbsa kbsb kbsk kbsr kbss kcaa kcab kcac kcap kcar kcas kcba kcbc kcbk kcbr kcbs kcca kccb kccc kcck kccr kckc kckk kckr kcpa kcpc kcpr kcps kcrc kcrp kcrr kcrs kcsa kcsb kcsc kcsp kcsr kcss kkaa kkac kkap kkar kkba kkbb kkbr kkbs kkcb kkck kkcr kkcs kkkk kkpc kkpk kkps kkrb kkrc kkrk kkrr kkrs kksa kksp kksr kkss kpac kpak kpar kpas kpba kpbb kpbr kpbs kpcc kpcr kpcs kpkk kpkr kppc kppk kppp kppr kprb kprc kprk kprp kprr kprs kpsc kpsp krab krac krak krap krar kras krba krbb krbk krbr krca krcb krcc krcs krka krkc krkk krkr krks krpa krpr krps krrb krrc krrk krrr krrs krsa krsc krsk krsr krss ksab ksac ksak ksar ksas ksba ksbc ksbp ksbr ksbs ksca kscb ksck kscr kscs kska kskb kskk kskr ksks kspa kspb kspc kspk kspr ksps ksra ksrb ksrp ksrr ksrs kssa kssr ksss paak paap paar paas paba paca pack pacs paka paks papa papb papp papr paps par- para parc park parp parr pars pasa pasc pask pasp pass pbac pbar pbcc pbpa pbpk pbrs pbsa pbsp pcaa pcap pcas pcba pcbc pcbs pcca pccc pccs pcks pcpb pcpp pcps pcra pcrc pcsa pkcs 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 psrk psrp pssa pssc raab raak raas raba rabb rabk rabs rac- raca racc rack racs raka rakk rapa rapc rapp raps rara rarb rark rars rasa rasc rask rasp rass rbbb rbbr rbbs rbsp rbss rcac rcas rcbc rccb rccc rccs rcps rcsa rcsc rcss rkss rpca rpcs rpps rras rrrr rrsp rsaa rscc rscs rspb rspk rsps rssa sa-c saab saac saak saap saar saas saba sabb sabc sabr sabs saca sacc sack sacr sacs saka sakb sakk saks sapa sapp saps sara sarc sark sarp sarr sars sasa sasc sask sass sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbrk sbsa sbsp scaa scab scac scak scap scar scas scba sccc sccp sccs sck- scpa scpb scps scr- scra scrc scrs scsa scsc scsr skab skac skap skar skpc skra skss sp-a spac spak spap spar spas spca spcc spcs spkr 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