-al a-a a-b a-c a-t aaa aab aac aak aal aas aat ab- aba abb abc abk abl abs abt ac- aca acb acc ack acl acs act aka akb akc akk akl aks al- ala alb alc alk all als alt as- asa asb asc ask asl ass ast at- ata atb atc atl ats att baa bab bac bak bal bas bat bba bbb bbc bbk bbl bbs bbt bca bcb bcc bck bcl bcs bct bka bkb bkc bkk bkl bks bkt bla blb blc blk bll bls blt bsa bsb bsc bsk bsl bss bst bta btb btc btk btl bts btt c-- caa cab cac cak cal cas cat cba cbb cbc cbk cbl cbs cbt cca ccb ccc cck ccl ccs cct cka ckb ckc cks ckt cl- cla clb clc clk cll cls clt csa csb csc csk csl css cst cta ctb ctc ctk ctl cts ctt k-t ka- kaa kab kac kak kal kas kat kba kbb kbc kbk kbl kbs kca kcb kcc kck kcl kcs kct kkb kkc kkk kkl kks kkt kl- kla klb klc kls klt ksa ksb ksc ksk ksl kss kst kta ktb ktc ktk ktl kts ktt la- laa lab lac lak lal las lat lba lbb lbc lbk lbl lbs lbt lca lcb lcc lck lcl lcs lct lka lkb lkl lks lkt lla llb llc llk lll lls llt lsa lsb lsc lsk lsl lss lst lta ltb ltc ltk ltl lts ltt saa sab sac sak sal sas sat sba sbb sbc sbk sbl sbs sbt sca scb scc sck scl scs sct sk- ska skb skc skk skl sks skt sla slb slc slk sll sls slt ss- ssa ssb ssc ssk ssl sss sst sta stb stc stk stl sts stt taa tab tac tak tal tas tat tba tbb tbc tbk tbl tbs tbt tca tcb tcc tck tcl tcs tct tka tkb tkc tkk tkl tks tkt tla tlc tlk tll tls tlt tsa tsb tsc tsk tsl tss tst tta ttb ttc ttk ttl tts ttt

a-ak aaaa aaab aaac aaal aaas aaba aabb aabc aabl aabt aaca aacb aacc aack aacl aacs aact aaka aala aalc aall aals aasa aasc aass aast aata aatc aatk aatt abaa abab abac abak abal abas abat abb- abba abbb abbs abbt abca abcb abcc abcl abcs abct abla abls abs- absa absl abss abta abts ac-t acaa acab acac acas acat acba acbl acca accc accs acct acks acla aclc acls acsa acsc acsl acss acst acta actc actl acts actt akaa akal akas akca akka aksa akst alaa alac alak alal alas alat alb- alba albc albs alca alcc alcs alk- alka alkb all- alla alll alls alsa alsc alst alta alts asaa asab asac asak asal asas asat asba asc- asca ascb ascc ascl asct aska asks askt asla assa assc assk assl asss asst asta astb astc astl asts at-l at-t ataa atab atac atak atal atas atat atbs atca atcc atck atcl atcs atka atkt atla atls atsb atsc atst atta atts baaa baak baal baas baat baba babb babs bac- baca bacc back bacs bact bak- baka bakl baks bakt bala balc balk ball bals balt basa basc bask bass bast bata batc bats batt bbas bbbb bbbs bblb bbls bcaa bcas bcat bcbc bcbs bcca bccc bccl bccs bcsa bcsc bcsl bcss bctc bcts blaa blab blac blak blas blat blbt blkb blls blss blst blts bsaa bsac bsas bsat bscs bskt bslc bssc bsts btaa btcc btcl btcs btla btss bttb caaa caab caac caal caas caat caba cabs cac- caca cacc cack caka cala calc calk call cals calt casa casb casc cask casl cass cast cat- cata catb catc cats catt cbac cbal cbat cbbc cbbs cbca cbcc cbcl cbcs cbct cbka cbkl cblb cblc cbsa cbsc cbta cbtc cbtl ccaa ccab ccac ccas ccat ccba ccbc ccca cccb cccc cccl cccs ccla cclc ccls ccsa ccsl ccss ccst cctb cctc cctl cctt ckac ckat ckbc ckck ckcl ckcs cksa cksb cksl ckst cktb ckts clab clas clat clsa clsc cltb cltc clts csaa csab csac csak csas csat cscb cscc cscl cscs cska csks csla cssa csta cstc csts ctab ctal ctba ctbs ctca ctls ctsa ctsc ctss ctta ctts kaaa kaab kaak kaal kaas kaat kaba kabb kabc kacb kacc kacl kacs kact kaka kakc kakk kaks kakt kala kalb kalc kalk kall kals kalt kas- kasa kasb kasc kask kasl kass kast kat- kata katb katc katk katl kats katt kbaa kbab kbac kbak kbal kbas kbat kbba kbbb kbbc kbbk kbbl kbbs kbbt kbca kbcb kbck kbcl kbcs kbct kbkb kbkk kbkl kbla kblb kbll kbls kblt kbsa kbsb kbsk kbss kbst kbta kbtb kbtc kbtk kbtl kbts kbtt kcaa kcab kcac kcal kcas kcat kcba kcbc kcbk kcbl kcbs kcca kccb kccc kcck kccl kcct kckc kckk kckl kcla kclc kclk kcll kcls kclt kcsa kcsb kcsc kcss kcst kcta kctb kctc kkaa kkac kkal kkat kkba kkbb kkbl kkbs kkbt kkcb kkck kkcl kkcs kkct kkkk kklb kklc kkll kkls kksa kkss kkst kktc kktk kktl kkts klaa klab klac klak klal klas klat klbb klbc klbl klbs klbt klca klcb klcc klck klcl klcs klka klkc klkk klkl klks klla kllb kllc kllk klls klsa klsc klst kltc kltk kltt ksab ksac ksak ksal ksas ksat ksba ksbc ksbl ksbs ksca kscb ksck kscl kscs kska kskb kskk ksks ksla kslb kslc kslk ksll kslt kssa kssl ksss ksst ksta kstb kstc kstk kstl ksts kstt ktaa ktak ktal ktas ktat ktba ktbb ktbc ktbl ktbt ktcc ktck ktcl ktcs ktkb ktkc ktkk ktks ktkt ktla ktlb ktlk ktlt ktsa ktsc ktsl ktst kttc kttk ktts kttt laaa laac laak laal laas laat laba labs laca lacc lack lacl lacs lact laka laks lala lall lasa lask lass last lata latc lats latt lbcc lbsc lcac lcat lcbc lcca lccc lccs lcls