aaaa aaab aaac aaas aaba aabb aabc aabt aaca aacb aacc aacs aact aacu aasa aasc aass aast aasu aata aatc aatt aaus abaa abab abac abas abat abau abb- abba abbb abbs abbt abca abcb abcc abcs abct abs- absa abss absu abta abts abtu abua abus abut ac-t acaa acab acac acas acat acba acca accc accs acct accu acsa acsc acss acst acta actc acts actt actu acu- acus acut asaa asab asac asas asat asau asba asbu asc- asca ascb ascc asct assa assc asss asst assu asta astb astc asts asub asus at-t ataa atab atac atas atat atbs atca atcc atcs atsb atsc atst atta atts attu atua atub atuc atus auaa auca auct ausa aust ausu aut- auts baaa baas baat baba babb babs babu bac- baca bacc bacs bact basa basc bass bast basu bata batc bats batt batu bau- bbas bbau bbbb bbbs bcaa bcas bcat bcbc bcbs bcca bccc bccs bcsa bcsc bcss bctc bcts bcuc bsaa bsac bsas bsat bscs bssc bsts btaa btcc btcs btss bttb btus buat buba bubb bubs bubu buca bucc bucs bucu busa busc buss bust busu but- buta buts butt buus caaa caab caac caas caat caba cabs cabu cac- caca cacc casa casb casc cass cast casu cat- cata catb catc cats catt catu cauc caus caut cbac cbat cbbc cbbs cbca cbcc cbcs cbct cbcu cbsa cbsc cbta cbtc cbus ccaa ccab ccac ccas ccat ccba ccbc ccca cccb cccc cccs cccu ccsa ccss ccst cctb cctc cctt ccuc ccus ccut csaa csab csac csas csat cscb cscc cscs cssa csta cstc csts csua csus ctab ctba ctbs ctca ctsa ctsc ctss ctsu ctta ctts cuau cub- cuba cubb cubs cuca cucc cusa cusb cuss cust cusu cut- cuta cutc cuts cutt sa-c saab saac saas saat saba sabb sabc sabs sabu saca sacc sacs sact sacu sasa sasc sass sast sata satb satc sats satt satu saua sauc saus saut sbaa sbac sbas sbbs sbca sbcc sbcs sbct sbsa sbst sbtc sbus scaa scab scac scas scat scba sccc sccs scct scsa scsc scst scsu sctc scts scua scub scut ssaa ssab ssac ssas ssat ssau ssca sscc sscs sssa sssb sssc ssss ssta sstb sstc ssts stab stac stas stat stau stbc stbs stca stcc stcs stcu stss sttc stub stuc stus stut suas suat sub- suba subb subs suc- succ sucs sus- susa suss sust susu suta sutu suus taa- taas taat taba tabb tabc tabs tabu taca tacc tacs tact tasa tasb tasc tass tast tasu tata tatb tats tatt tatu taua taub tauc taus taut tbas tbbs tbca tbcb tbcc tbst tbta tcbs tcca tccc tccu tctc tcts tsaa tsat tsau tsbc tsca tscc tssa tsst tstc tsts ttab ttbb ttss tttt tuas tuat tuba tubb tubs tubu tuca tucc tusa tusc tuss tust tuta tuts tutt tutu uabc uaca uasa uata uatu uaua ubac ubba ucas ucat ucbc ucca ucsa ucsb ucsc ucst ucsu ucua ucut us-a usaa usac usas usat usba usbc usbs usca uscc uscs ussa ussb ussc usss usst ussu usta ustb ustc usts usua usus utac utas utau utsa utsc uttu uuta uuuu