a-ii aaaa aaab aaac aaai aaas aaba aabb aabc aabi aaca aacb aacc aaci aacs aaib aaic aaii aais aasa aasc aasi aass abaa abab abac abai abas abb- abba abbb abbi abbs abca abcb abcc abci abcs abia abib abic abis abs- absa absi abss acaa acab acac acai acas acba acca accc acci accs aci- acia acic acis acsa acsc acsi acss aiai aias aiba aica aicc aics aiia aiib aiic aisa aisb aisi asaa asab asac asai asas asba asc- asca ascb ascc asci asia asic asii asis assa assc assi asss ba-i baaa baas baba babb babi babs bac- baca bacc baci bacs baia baib baic bais basa basc basi bass bbas bbbb bbbs bbci bcaa bcas bcbc bcbs bcca bccc bcci bccs bcia bcis bcsa bcsc bcss bias biba bibb bibi bibs bica bicc bici bics biis bis- bisa bisc biss bsaa bsac bsas bsci bscs bsic bssc caaa caab caac caas caba cabi cabs cac- caca cacc caci caia caib caic cais casa casb casc casi cass cbac cbbc cbbs cbca cbcc cbcs cbia cbsa cbsc cbsi ccaa ccab ccac ccai ccas ccba ccbc ccca cccb cccc ccci cccs ccic ccii ccis ccsa ccsi ccss ciaa cias ciba cibc cibi cica cicc cici cics ciia ciii ciis cis- cisa cisc ciss csaa csab csac csas cscb cscc csci cscs csia csib csis cssa iaaa iaac iaai iaas iaba iaca iacc iacs iaia iais iasa iasc iasi ibac ibas ibca ibcs ibia ibis ibsa ibss icaa icab icac icai icas icbc icbs icca iccb iccc icci iccs icis icsa icsb icsc icsi icss iiac iias iica iiii iiis iisc iisi is-a isac isai isas isba isca iscc isci iscs isia isic isis issa issc issi isss s-ib s-ic s-ii sa-c saab saac saas saba sabb sabc sabi sabs saca sacc saci sacs saia saic sais sasa sasc sasi sass sbaa sbac sbai sbas sbbs sbca sbcc sbcs sbia sbic sbsa sbsi scaa scab scac scai scas scba scbi sccc sccs sci- scia scic scis scsa scsc scsi siaa siab siac siai sias siba sibc sibi sibs sica sicc sici sics sisa sisc sisi siss ssaa ssab ssac ssas ssca sscc ssci sscs ssis sssa sssb sssc sssi ssss