aaaa aaab aaac aaas aaba aabb aabc aabt aaca aacb aacc aacs aact aasa aasc aass aast aata aatc aatt abaa abab abac abas abat abb- abba abbb abbs abbt abca abcb abcc abcs abct abs- absa abss abta abts ac-t acaa acab acac acas acat acba acca accc accs acct acsa acsc acss acst acta actc acts actt asaa asab asac asas asat asba asc- asca ascb ascc asct 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 basa basc bass bast bata batc bats batt bbas bbbb bbbs bcaa bcas bcat bcbc bcbs bcca bccc bccs bcsa bcsc bcss bctc bcts bsaa bsac bsas bsat bscs bssc bsts btaa btcc btcs btss bttb caaa caab caac caas caat caba cabs cac- caca cacc casa casb casc cass cast cat- cata catb catc cats catt cbac cbat cbbc cbbs cbca cbcc cbcs cbct cbsa cbsc cbta cbtc ccaa ccab ccac ccas ccat ccba ccbc ccca cccb cccc cccs ccsa ccss ccst cctb cctc cctt csaa csab csac csas csat cscb cscc cscs cssa csta cstc csts ctab ctba ctbs ctca ctsa ctsc ctss ctta ctts sa-c saab saac saas saat saba sabb sabc sabs saca sacc sacs sact sasa sasc sass sast sata satb satc sats satt sbaa sbac sbas sbbs sbca sbcc sbcs sbct sbsa sbst sbtc scaa scab scac scas scat scba sccc sccs scct scsa scsc scst sctc scts ssaa ssab ssac ssas ssat ssca sscc sscs sssa sssb sssc ssss ssta sstb sstc ssts stab stac stas stat stbc stbs stca stcc stcs stss sttc taa- taas taat taba tabb tabc tabs taca tacc tacs tact tasa tasb tasc tass tast tata tatb tats tatt tbas tbbs tbca tbcb tbcc tbst tbta tcbs tcca tccc tctc tcts tsaa tsat tsbc tsca tscc tssa tsst tstc tsts ttab ttbb ttss tttt