-al a-a a-b a-c aaa aab aac aag aak aal aar aas ab- aba abb abc abg abk abl abr abs ac- aca acb acc acg ack acl acr acs ag- aga agb agc agg agk agl agr ags aka akb akc akg akk akl akr aks al- ala alb alc alg alk all alr als ar- ara arb arc arg ark arl arr ars as- asa asb asc asg ask asl asr ass baa bab bac bag bak bal bar bas bba bbb bbc bbg bbk bbl bbr bbs bca bcb bcc bcg bck bcl bcr bcs bga bgb bgc bgg bgk bgl bgr bgs bka bkb bkc bkg bkk bkl bkr bks bla blb blc blg blk bll blr bls bra brb brg brk brl brr brs bsa bsb bsc bsg bsk bsl bsr bss c-- caa cab cac cag cak cal car cas cba cbb cbc cbg cbk cbl cbr cbs cca ccb ccc ccg cck ccl ccr ccs cga cgb cgc cgg cgl cgr cgs cka ckb ckc cks cl- cla clb clc clg clk cll clr cls cra crb crc crg crk crl crr crs csa csb csc csg csk csl csr css gaa gab gac gag gak gal gar gas gba gbc gbg gbk gbl gbr gbs gca gcb gcc gcg gck gcl gcr gcs gga ggb ggc ggg ggr ggs gka gkb gks gla glb glc glg glk gll glr gls gra grb grc grg grk grl grr grs gsa gsb gsc gsg gsk gsl gsr gss ka- kaa kab kac kag kak kal kar kas kba kbb kbc kbk kbl kbr kbs kca kcb kcc kcg kck kcl kcr kcs kga kgb kgc kgl kgs kkb kkc kkk kkl kkr kks kl- kla klb klc klg klr kls kra krc krg krk krl krr krs ksa ksb ksc ksg ksk ksl ksr kss la- laa lab lac lag lak lal lar las lba lbb lbc lbg lbk lbl lbr lbs lca lcb lcc lcg lck lcl lcr lcs lga lgb lgc lgg lgk lgl lgr lgs lka lkb lkg lkl lkr lks lla llb llc llg llk lll llr lls lra lrb lrc lrg lrk lrr lrs lsa lsb lsc lsg lsk lsl lsr lss ra- raa rab rac rag rak ral rar ras rba rbb rbc rbg rbk rbl rbr rbs rca rcb rcc rcg rcl rcr rcs rga rgb rgc rgg rgk rgr rgs rkb rkc rkg rkk rks rla rlc rlg rll rlr rls rra rrb rrc rrg rrk rrl rrr rrs rsa rsb rsc rsg rsk rsl rsr rss saa sab sac sag sak sal sar sas sba sbb sbc sbg sbk sbl sbr sbs sca scb scc scg sck scl scr scs sga sgb sgc sgg sgk sgl sgr sgs sk- ska skb skc skg skk skl skr sks sla slb slc slg slk sll slr sls sr- sra srb src srg srk srl srr srs ss- ssa ssb ssc ssg ssk ssl ssr sss

a-ak aaaa aaab aaac aaal aaar aaas aaba aabb aabc aabl aaca aacb aacc aack aacl aacr aacs aaka aala aalc aall aals aara aarc aars aasa aasc aass abaa abab abac abag abak abal abar abas abb- abba abbb abbr abbs abca abcb abcc abcl abcr abcs abgl abla abls abra abrc abrs abs- absa absl abss acaa acab acac acag acar acas acba acbl acca accc accs acga acgr acgs acks acla aclc aclr acls acr- acra acrc acrr acrs acsa acsc acsl acss agac agag agal agar agas agba agca agcc agga agla aglc agls agra agrl agsa agsg akaa akal akar akas akca akka akr- akra aksa alaa alac alag alak alal alar alas alb- alba albc albs alca alcc alcs alg- alga algs alk- alka alkb all- alla alll allr alls alsa alsc arab arac arag arak aral arar aras arba arbs arc- arca arcs arga argb args arka arks arla arr- arra arrc arrg arrk arrr arrs ars- arsa arsc arsk asaa asab asac asag asak asal asar asas asba asc- asca ascb ascc ascl ascr aska askr asks asla aslr asra asrc asrg asrs assa assc assk assl assr asss baaa baak baal baar baas baba babb babr babs bac- baca bacc back bacs baga bagg bags bak- baka bakl bakr baks bala balc balk ball bals bar- bara barb barc barg bark barr bars basa basc bask bass bbas bbbb bbbs bbga bblb bbls bbrc bbrg bcaa bcar bcas bcbc bcbg bcbs bcca bccc bccl bccs bcgs bcra bcrs bcsa bcsc bcsl bcss bgca bggs blaa blab blac blag blak blas blkb blls blrc blrg blss brab brac brag brak bras brca brcb brka brkb brls brrr brrs brsb brsr bsaa bsac bsas bscs bsgs bslc bsra bssc caaa caab caac caal caas caba cabg cabs cac- caca cacc cack cacr caga cagg cagr cags caka cala calc calk call cals cara carb carc cark carl carr cars casa casb casc cask casl casr cass cbac cbal cbar cbbc cbbs cbca cbcc cbcl cbcr cbcs cbga cbgb cbka cbkg cbkl cbkr cblb cblc cbrl cbsa cbsc ccaa ccab ccac ccag ccar ccas ccba ccbc ccca cccb cccc cccl cccs ccga ccgc ccgs ccla cclc cclg ccls ccra ccrc ccrg ccrl ccrs ccsa ccsg ccsl ccss cgac cgal cgas cgcc cgcg cggs cgsb cgss ckac ckbc ckck ckcl ckcs ckga ckgl cklg ckrc cksa cksb cksl clab clag clar clas clkg clra clrs clsa clsc crab crac crag crar cras crbc crca crcc crcr crgs crkc crkl crls crsa crss csaa csab csac csak csar csas cscb cscc cscl cscr cscs cska csks csla cslr csra csrc csrs cssa cssr gaal gaar gaas gaba gabb gabl gabr gabs gack gaga gagg gags gala galk gall gals gara garb garg garr gars gasa gasb gasc gask gasl gasr gass gbag gbas gbbs gc-c gcaa gcal gcbc gccc gccs gclc gcrg gcss ggcl gggg ggss glaa glab glak glar glas glbc glcc glrb grab grac gras grbr