a-ak aaaa aaab aaac aaal aaas aaba aabb aabc aabl aaca aacb aacc aack aacl aacs aaka aala aalc aall aals aasa aasc aass abaa abab abac abag abak abal abas abb- abba abbb abbs abca abcb abcc abcl abcs abgl abla abls abs- absa absl abss acaa acab acac acag acas acba acbl acca accc accs acga acgs acks acla aclc acls acsa acsc acsl acss agac agag agal agas agba agca agcc agga agla aglc agls agsa agsg akaa akal akas akca akka aksa alaa alac alag alak alal alas alb- alba albc albs alca alcc alcs alg- alga algs alk- alka alkb all- alla alll alls alsa alsc asaa asab asac asag asak asal asas asba asc- asca ascb ascc ascl aska asks asla assa assc assk assl asss baaa baak baal baas baba babb babs bac- baca bacc back bacs baga bagg bags bak- baka bakl baks bala balc balk ball bals basa basc bask bass bbas bbbb bbbs bbga bblb bbls bcaa bcas bcbc bcbg bcbs bcca bccc bccl bccs bcgs bcsa bcsc bcsl bcss bgca bggs blaa blab blac blag blak blas blkb blls blss bsaa bsac bsas bscs bsgs bslc bssc caaa caab caac caal caas caba cabg cabs cac- caca cacc cack caga cagg cags caka cala calc calk call cals casa casb casc cask casl cass cbac cbal cbbc cbbs cbca cbcc cbcl cbcs cbga cbgb cbka cbkg cbkl cblb cblc cbsa cbsc ccaa ccab ccac ccag ccas ccba ccbc ccca cccb cccc cccl cccs ccga ccgc ccgs ccla cclc cclg ccls ccsa ccsg ccsl ccss cgac cgal cgas cgcc cgcg cggs cgsb cgss ckac ckbc ckck ckcl ckcs ckga ckgl cklg cksa cksb cksl clab clag clas clkg clsa clsc csaa csab csac csak csas cscb cscc cscl cscs cska csks csla cssa gaal gaas gaba gabb gabl gabs gack gaga gagg gags gala galk gall gals gasa gasb gasc gask gasl gass gbag gbas gbbs gc-c gcaa gcal gcbc gccc gccs gclc gcss ggcl gggg ggss glaa glab glak glas glbc glcc gsab gsal gskb kaaa kaab kaag kaak kaal kaas kaba kabb kabc kabg kacb kacc kacl kacs kag- kaga kagb kagc kagg kagl kags kaka kakc kakk kaks kala kalb kalc kalk kall kals kas- kasa kasb kasc kask kasl kass kbaa kbab kbac kbak kbal kbas kbba kbbb kbbc kbbg kbbk kbbl kbbs kbca kbcb kbck kbcl kbcs kbga kbgb kbgg kbgl kbkb kbkg kbkk kbkl kbla kblb kblg kbll kbls kbsa kbsb kbsg kbsk kbss kcaa kcab kcac kcal kcas kcba kcbc kcbk kcbl kcbs kcca kccb kccc kcck kccl kcgc kcgl kcgs kckc kckk kckl kcla kclc kclk kcll kcls kcsa kcsb kcsc kcsg kcss kgab kgac kgak kgal kgas kgba kgbb kgbc kgcb kgcc kgcl kgga kggg kggl kgkl kgks kgla kglb kglk kgls kgsl kkaa kkac kkag kkal kkba kkbb kkbg kkbl kkbs kkcb kkck kkcl kkcs kkgb kkgl kkkk kklb kklc kkll kkls kksa kkss klaa klab klac klag klak klal klas klbb klbc klbl klbs klca klcb klcc klck klcl klcs klga klgb klgl klka klkc klkk klkl klks klla kllb kllc kllk klls klsa klsc ksab ksac ksak ksal ksas ksba ksbc ksbl ksbs ksca kscb ksck kscl kscs ksgc ksgg ksgl kska kskb kskg kskk ksks ksla kslb kslc kslg kslk ksll kssa kssl ksss laaa laac laag laak laal laas laba labs laca lacc lack lacl lacs lag- laga lagg lags laka laks lala lall lasa lask lass lbcc lbsc lcac lcbc lcca lccc lccs lcls lcsc lgca lkab lkal llbs llcc llcs llgc llks lllc llll lscb lscs lsla lssa sa-c saab saac saag saak saal saas saba sabb sabc sabs saca sacc sack sacs saga sagg sags saka sakb sakk saks sala salc salk sall sals sasa sasc sask sasl sass sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scag scak scal scas scba sccc sccl sccs scgs sck- sckl scl- sclc sclk scls scsa scsc scsl sgaa sgac sgca sgcb sgcg sggg sggs sgls sgss skab skac skag skal skss slaa slab slac slag slak slas slcc slsa slsc ssaa ssab ssac ssas ssca sscc sscs ssgs ssla sslc sssa sssb sssc ssss