a-ii aaaa aaab aaac aaai aaas aaba aabb aabc aabi aabt aaca aacb aacc aaci aacs aact aaib aaic aaii aais aasa aasc aasi aass aast aata aatc aatt abaa abab abac abai abas abat abb- abba abbb abbi abbs abbt abca abcb abcc abci abcs abct abia abib abic abis abit abs- absa absi abss abta abts ac-t acaa acab acac acai acas acat acba acca accc acci accs acct aci- acia acic acis acsa acsc acsi acss acst acta actc acti acts actt aiai aias aiba aica aicc aics aiia aiib aiic aisa aisb aisi aist aita aiti aits aitt asaa asab asac asai asas asat asba asc- asca ascb ascc asci asct asia asic asii asis asit assa assc assi asss asst asta astb astc asti asts at-t ataa atab atac atai atas atat atbs atca atcc atcs atia atic atis atit atsb atsc atsi atst atta atti atts ba-i baaa baas baat baba babb babi babs bac- baca bacc baci bacs bact baia baib baic bais bait basa basc basi bass bast bata batc bati bats batt bbas bbbb bbbs bbci bcaa bcas bcat bcbc bcbs bcca bccc bcci bccs bcia bcis bcit bcsa bcsc bcss bctc bcts bias biat biba bibb bibi bibs bica bicc bici bics biis bis- bisa bisc biss bist bita bitc bits bitt bsaa bsac bsas bsat bsci bscs bsic bssc bsts btaa btcc btcs btss bttb caaa caab caac caas caat caba cabi cabs cac- caca cacc caci caia caib caic cais cait casa casb casc casi cass cast cat- cata catb catc cati cats catt cbac cbat cbbc cbbs cbca cbcc cbcs cbct cbia cbit cbsa cbsc cbsi cbta cbtc ccaa ccab ccac ccai ccas ccat ccba ccbc ccca cccb cccc ccci cccs ccic ccii ccis ccsa ccsi ccss ccst cctb cctc cctt ciaa cias ciat ciba cibc cibi cica cicc cici cics cict ciia ciii ciis ciit cis- cisa cisc ciss cist cita citb citi cits citt csaa csab csac csas csat cscb cscc csci cscs csia csib csis csit cssa csta cstc csts ctab ctba ctbi ctbs ctca ctia ctic ctsa ctsc ctss ctta ctts iaaa iaac iaai iaas iaat iaba iaca iacc iacs iact iaia iais iasa iasc iasi iata iatc iati ibac ibas ibat ibca ibcs ibia ibis ibsa ibss ibtb ibtc ibts icaa icab icac icai icas icat icbc icbs icca iccb iccc icci iccs icct icis icsa icsb icsc icsi icss icst icta icts iiac iias iica iiii iiis iiit iisc iisi iist iita iitt is-a isac isai isas isat isba isbt isca iscc isci iscs isct isia isic isis isit issa issc issi isss ista istc isti ists itaa itac itai itas itat itbs itcs itia itic itis itsa itsi itta s-ib s-ic s-ii sa-c saab saac saas saat saba sabb sabc sabi sabs saca sacc saci sacs sact saia saic sais sait sasa sasc sasi sass sast sata satb satc sati sats satt sbaa sbac sbai sbas sbbs sbca sbcc sbcs sbct sbia sbic sbsa sbsi sbst sbtc scaa scab scac scai scas scat scba scbi sccc sccs scct sci- scia scic scis scit scsa scsc scsi scst sctc scts siaa siab siac siai sias siat siba sibc sibi sibs sica sicc sici sics siit sisa sisc sisi siss sist sit- sita sitc siti sits sitt ssaa ssab ssac ssas ssat ssca sscc ssci sscs ssis ssit sssa sssb sssc sssi ssss ssta sstb sstc ssts stab stac stai stas stat stbc stbs stca stcc stcs stia stib stic stis stit stsi stss sttc taa- taas taat taba tabb tabc tabi tabs taca tacc taci tacs tact taia tais tait tasa tasb tasc tasi tass tast tata tatb tati tats tatt tbas tbbs tbca tbcb tbcc tbit tbst tbta tcbs tcca tccc tctc tcts tiaa tiab tias tiba tibi tibs tica ticc tics tiit tisa tisb tisi tiss tist tita titc titi tits titt tsaa tsai tsat tsbc tsca tscc tsia tsis tssa tssi tsst tstc tsts ttab ttbb ttss tttt