-al a-a a-b a-c a-t aaa aab aac aak aal aar aas aat ab- aba abb abc abk abl abr abs abt ac- aca acb acc ack acl acr acs act aka akb akc akk akl akr aks al- ala alb alc alk all alr als alt ar- ara arb arc ark arl arr ars art as- asa asb asc ask asl asr ass ast at- ata atb atc atl atr ats att baa bab bac bak bal bar bas bat bba bbb bbc bbk bbl bbr bbs bbt bca bcb bcc bck bcl bcr bcs bct bka bkb bkc bkk bkl bkr bks bkt bla blb blc blk bll blr bls blt bra brb brk brl brr brs brt bsa bsb bsc bsk bsl bsr bss bst bta btb btc btk btl btr bts btt c-- caa cab cac cak cal car cas cat cba cbb cbc cbk cbl cbr cbs cbt cca ccb ccc cck ccl ccr ccs cct cka ckb ckc cks ckt cl- cla clb clc clk cll clr cls clt cra crb crc crk crl crr crs crt csa csb csc csk csl csr css cst cta ctb ctc ctk ctl ctr cts ctt k-t ka- kaa kab kac kak kal kar kas kat kba kbb kbc kbk kbl kbr kbs kca kcb kcc kck kcl kcr kcs kct kkb kkc kkk kkl kkr kks kkt kl- kla klb klc klr kls klt kra krc krk krl krr krs krt ksa ksb ksc ksk ksl ksr kss kst kta ktb ktc ktk ktl ktr kts ktt la- laa lab lac lak lal lar las lat lba lbb lbc lbk lbl lbr lbs lbt lca lcb lcc lck lcl lcr lcs lct lka lkb lkl lkr lks lkt lla llb llc llk lll llr lls llt lra lrb lrc lrk lrr lrs lrt lsa lsb lsc lsk lsl lsr lss lst lta ltb ltc ltk ltl ltr lts ltt ra- raa rab rac rak ral rar ras rat rba rbb rbc rbk rbl rbr rbs rbt rca rcb rcc rcl rcr rcs rct rkb rkc rkk rks rkt rla rlc rll rlr rls rlt rra rrb rrc rrk rrl rrr rrs rrt rsa rsb rsc rsk rsl rsr rss rst rta rtb rtc rtk rtl rtr rts rtt saa sab sac sak sal sar sas sat sba sbb sbc sbk sbl sbr sbs sbt sca scb scc sck scl scr scs sct sk- ska skb skc skk skl skr sks skt sla slb slc slk sll slr sls slt sr- sra srb src srk srl srr srs srt ss- ssa ssb ssc ssk ssl ssr sss sst sta stb stc stk stl str sts stt taa tab tac tak tal tar tas tat tba tbb tbc tbk tbl tbr tbs tbt tca tcb tcc tck tcl tcr tcs tct tka tkb tkc tkk tkl tkr tks tkt tla tlc tlk tll tlr tls tlt tra trb trc trk trl trr trs trt tsa tsb tsc tsk tsl tsr tss tst tta ttb ttc ttk ttl ttr tts ttt

a-ak aaaa aaab aaac aaal aaar aaas aaba aabb aabc aabl aabt aaca aacb aacc aack aacl aacr aacs aact aaka aala aalc aall aals aara aarc aars aart aasa aasc aass aast aata aatc aatk aatt abaa abab abac abak abal abar abas abat abb- abba abbb abbr abbs abbt abca abcb abcc abcl abcr abcs abct abla abls abra abrc abrs abs- absa absl abss abta abts ac-t acaa acab acac acar acas acat acba acbl acca accc accs acct acks acla aclc aclr acls acr- acra acrc acrr acrs acsa acsc acsl acss acst acta actc actl acts actt akaa akal akar akas akca akka akr- akra aksa akst alaa alac alak alal alar alas alat alb- alba albc albs alca alcc alcs alk- alka alkb all- alla alll allr alls alsa alsc alst alta alts arab arac arak aral arar aras arat arba arbs arc- arca arcs arct arka arks arla arr- arra arrc arrk arrr arrs arrt ars- arsa arsc arsk arst arta artc artr arts asaa asab asac asak asal asar asas asat asba asc- asca ascb ascc ascl ascr asct aska askr asks askt asla aslr asra asrc asrs assa assc assk assl assr asss asst asta astb astc astl astr asts at-l at-t ataa atab atac atak atal atar atas atat atbs atca atcc atck atcl atcr atcs atka atkt atla atls atra atrc atrk atsb atsc atst atta attr atts baaa baak baal baar baas baat baba babb babr babs bac- baca bacc back bacs bact bak- baka bakl bakr baks bakt bala balc balk ball bals balt bar- bara barb barc bark barr bars bart basa basc bask bass bast bata batc bats batt bbas bbbb bbbs bblb bbls bbrc bcaa bcar bcas bcat bcbc bcbs bcca bccc bccl bccs bcra bcrs bcsa bcsc bcsl bcss bctc bcts blaa blab blac blak blas blat blbt blkb blls blrc blss blst blts brab brac brak bras brat brca brcb brka brkb brls brrr brrs brsb brsr brst brtc bsaa bsac bsas bsat bscs bskt bslc bsra bssc bsts btaa btcc btcl btcs btla btrc btrt btss bttb caaa caab caac caal caas caat caba cabs cac- caca cacc cack cacr caka cala calc calk call cals calt cara carb carc cark carl carr cars cart casa casb casc cask casl casr cass cast cat- cata catb catc cats catt cbac cbal cbar cbat cbbc cbbs cbca cbcc cbcl cbcr cbcs cbct cbka cbkl cbkr cblb cblc cbrl cbrt cbsa cbsc cbta cbtc cbtl ccaa ccab ccac ccar ccas ccat ccba ccbc ccca cccb cccc cccl cccs ccla cclc ccls ccra ccrc ccrl ccrs ccrt ccsa ccsl ccss ccst cctb cctc cctl cctt ckac ckat ckbc ckck ckcl ckcs ckrc cksa cksb cksl ckst cktb ckts clab clar clas clat clra clrs clsa clsc cltb cltc clts crab crac crar cras crat crbc crca crcc crcr crkc crkl crls crrt