aaaa aaab aaac aaas aaba aabb aabc aabt aaca aacb aacc aacs aact aasa aasc aass aast aata aatc aatt abaa abab abac abag abas abat abb- abba abbb abbs abbt abca abcb abcc abcs abct abs- absa abss abta abts ac-t acaa acab acac acag acas acat acba acca accc accs acct acga acgs acsa acsc acss acst acta actc actg acts actt agac agag agas agat agba agca agcc agct agga agsa agsg agst agta agts asaa asab asac asag asas asat asba asc- asca ascb ascc asct asgt assa assc asss asst asta astb astc asts at-t ataa atab atac atas atat atbs atca atcc atcs atsb atsc atst atta atts baaa baas baat baba babb babs bac- baca bacc bacs bact baga bagg bags bagt basa basc bass bast bata batc bats batt bbas bbbb bbbs bbga bcaa bcas bcat bcbc bcbg bcbs bcca bccc bccs bcgs bcsa bcsc bcss bctc bcts bgca bggs bgst bsaa bsac bsas bsat bscs bsgs bssc bsts btaa btcc btcs btss bttb caaa caab caac caas caat caba cabg cabs cac- caca cacc caga cagg cags casa casb casc cass cast cat- cata catb catc cats catt cbac cbat cbbc cbbs cbca cbcc cbcs cbct cbga cbgb cbsa cbsc cbta cbtc ccaa ccab ccac ccag ccas ccat ccba ccbc ccca cccb cccc cccs ccga ccgc ccgs ccgt ccsa ccsg ccss ccst cctb cctc cctt cgac cgas cgcc cgcg cggs cgsb cgss cgst csaa csab csac csas csat cscb cscc cscs cssa csta cstc cstg csts ctab ctag ctba ctbs ctca ctsa ctsc ctss ctta ctts gaas gaba gabb gabs gabt gaga gagg gags gasa gasb gasc gass gast gata gatc gats gatt gbag gbas gbbs gc-c gcaa gcat gcbc gccc gccs gcss gcst gctc gcts ggbt gggg ggss gsab gsat gtaa gtcs gtta sa-c saab saac saag saas saat saba sabb sabc sabs saca sacc sacs sact saga sagg sags sagt sasa sasc sass sast sata satb satc satg sats satt sbaa sbac sbas sbbs sbca sbcc sbcs sbct sbsa sbst sbtc scaa scab scac scag scas scat scba sccc sccs scct scgs scsa scsc scst sctc scts sgaa sgac sgca sgcb sgcg sggg sggs sgss sgta sgts ssaa ssab ssac ssas ssat ssca sscc sscs ssgs ssgt sssa sssb sssc ssss ssta sstb sstc ssts stab stac stag stas stat stbc stbs stca stcc stcs stss sttc taa- taag taas taat taba tabb tabc tabs taca tacc tacs tact taga tagg tags tasa tasb tasc tass tast tata tatb tats tatt tbas tbbs tbca tbcb tbcc tbgs tbst tbta tcbs tcca tccc tcga tctc tcts tgcc tgtc tgts tsaa tsat tsbc tsca tscc tscg tsgt tssa tssg tsst tstc tsts ttab ttbb ttss tttt