aaaa aaab aaac aaar aaas aaba aabb aabc aabt aaca aacb aacc aacr aacs aact aara aarc aars aart aasa aasc aass aast aata aatc aatt abaa abab abac abar abas abat abb- abba abbb abbr abbs abbt abca abcb abcc abcr abcs abct abra abrc abrs abs- absa abss abta abts ac-t acaa acab acac acar acas acat acba acca accc accs acct acr- acra acrc acrr acrs acsa acsc acss acst acta actc acts actt arab arac arar aras arat arba arbs arc- arca arcs arct arr- arra arrc arrr arrs arrt ars- arsa arsc arst arta artc artr arts asaa asab asac asar asas asat asba asc- asca ascb ascc ascr asct asra asrc asrs assa assc assr asss asst asta astb astc astr asts at-t ataa atab atac atar atas atat atbs atca atcc atcr atcs atra atrc atsb atsc atst atta attr atts baaa baar baas baat baba babb babr babs bac- baca bacc bacs bact bar- bara barb barc barr bars bart basa basc bass bast bata batc bats batt bbas bbbb bbbs bbrc bcaa bcar bcas bcat bcbc bcbs bcca bccc bccs bcra bcrs bcsa bcsc bcss bctc bcts brab brac bras brat brca brcb brrr brrs brsb brsr brst brtc bsaa bsac bsas bsat bscs bsra bssc bsts btaa btcc btcs btrc btrt btss bttb caaa caab caac caas caat caba cabs cac- caca cacc cacr cara carb carc carr cars cart casa casb casc casr cass cast cat- cata catb catc cats catt cbac cbar cbat cbbc cbbs cbca cbcc cbcr cbcs cbct cbrt cbsa cbsc cbta cbtc ccaa ccab ccac ccar ccas ccat ccba ccbc ccca cccb cccc cccs ccra ccrc ccrs ccrt ccsa ccss ccst cctb cctc cctt crab crac crar cras crat crbc crca crcc crcr crrt crsa crss crst crtc crts csaa csab csac csar csas csat cscb cscc cscr cscs csra csrc csrs cssa cssr csta cstc cstr csts ctab ctba ctbs ctca ctrc ctrs ctsa ctsc ctss ctta ctts raab raas raat raba rabb rabs rac- raca racc racs ract rara rarb rars rasa rasc rass rast rata rats ratt rbbb rbbr rbbs rbss rbst rcac rcas rcbc rccb rccc rccs rcsa rcsc rcss rctc rcts rras rrat rrrr rsaa rscc rscs rssa rsts rtas rtca rtcc rtss rtts sa-c saab saac saar saas saat saba sabb sabc sabr sabs saca sacc sacr sacs sact sara sarc sarr sars sart sasa sasc sass sast sata satb satc satr sats satt sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbct sbsa sbst sbtc scaa scab scac scar scas scat scba sccc sccs scct scr- scra scrc scrs scsa scsc scsr scst sctc sctr scts sras srbc srcc srct srta srtr ssaa ssab ssac ssas ssat ssbr ssca sscc sscs ssra ssrc ssrs sssa sssb sssc ssss ssta sstb sstc ssts stab stac star stas stat stbc stbs stca stcc stcs stra strc strs stss sttc sttr taa- taar taas taat taba tabb tabc tabs taca tacc tacs tact tara tarb tarc tarr tars tart tasa tasb tasc tasr tass tast tata tatb tatr tats tatt tbar tbas tbbs tbca tbcb tbcc tbrb tbst tbta tcbs tcca tccc tctc tcts traa trab trac tras trat trca trcc trra trst trtc trtr tsaa tsar tsat tsbc tsca tscc tssa tssr tsst tstc tsts ttab ttbb ttss tttt