a-a a-b a-c aaa aab aac aak aap aar aas ab- aba abb abc abk abp abr abs ac- aca acb acc ack acp acr acs aka akb akc akk akp akr aks ap- apa apb apc apk app apr aps ar- ara arb arc ark arp arr ars as- asa asb asc ask asp asr ass b-p baa bab bac bak bap bar bas bba bbb bbc bbk bbp bbr bbs bca bcb bcc bck bcp bcr bcs bka bkb bkc bkk bkp bkr bks bpa bpb bpc bpp bpr bps bra brb brk brp brr brs bsa bsb bsc bsk bsp bsr bss c-- caa cab cac cak cap car cas cba cbb cbc cbk cbp cbr cbs cca ccb ccc cck ccp ccr ccs cka ckb ckc cks cpa cpb cpc cpk cpp cpr cps cra crb crc crk crp crr crs csa csb csc csk csp csr css ka- kaa kab kac kak kap kar kas kba kbb kbc kbk kbp kbr kbs kca kcb kcc kck kcp kcr kcs kkb kkc kkk kkp kkr kks kpa kpc kpk kpp kpr kps kra krc krk krp krr krs ksa ksb ksc ksk ksp ksr kss p-p paa pab pac pak pap par pas pba pbb pbc pbk pbp pbr pbs pca pcb pcc pck pcp pcr pcs pka pkb pkc pkp pkr pks ppa ppb ppc ppk ppp ppr pps pra prb prc prk prp prr prs ps- psa psb psc psk psp psr pss ra- raa rab rac rak rap rar ras rba rbb rbc rbk rbp rbr rbs rca rcb rcc rcp rcr rcs rkb rkc rkk rkp rks rpa rpb rpc rpk rpp rpr rps rra rrb rrc rrk rrp rrr rrs rsa rsb rsc rsk rsp rsr rss saa sab sac sak sap sar sas sba sbb sbc sbk sbp sbr sbs sca scb scc sck scp scr scs sk- ska skb skc skk skp skr sks spa spb spc spk spp spr sps sr- sra srb src srk srp srr srs ss- ssa ssb ssc ssk ssp ssr sss

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