a-ii aaaa aaab aaac aaai aaas aaba aabb aabc aabi aaca aacb aacc aaci aacs aacu aaib aaic aaii aais aasa aasc aasi aass aasu aaus abaa abab abac abai abas abau abb- abba abbb abbi abbs abca abcb abcc abci abcs abia abib abic abis abiu abs- absa absi abss absu abua abus acaa acab acac acai acas acba acca accc acci accs accu aci- acia acic acis acsa acsc acsi acss acu- acus aiai aias aiba aica aicc aics aiia aiib aiic aisa aisb aisi aiui asaa asab asac asai asas asau asba asbu asc- asca ascb ascc asci asia asic asii asis assa assc assi asss assu asub asui asus auaa auca auci auis ausa ausu ba-i baaa baas baba babb babi babs babu bac- baca bacc baci bacs baia baib baic bais basa basc basi bass basu bau- bbas bbau bbbb bbbs bbci bcaa bcas bcbc bcbs bcca bccc bcci bccs bcia bcis bcsa bcsc bcss bcuc bias biba bibb bibi bibs bica bicc bici bics biis bis- bisa bisc biss bisu bsaa bsac bsas bsci bscs bsic bssc buba bubb bubi bubs bubu buca bucc buci bucs bucu buic buis buiu busa busc busi buss busu buus caaa caab caac caas caba cabi cabs cabu cac- caca cacc caci caia caib caic cais caiu casa casb casc casi cass casu cauc caus cbac cbbc cbbs cbca cbcc cbcs cbcu cbia cbsa cbsc cbsi cbus ccaa ccab ccac ccai ccas ccba ccbc ccca cccb cccc ccci cccs cccu ccic ccii ccis ccsa ccsi ccss ccuc ccus ciaa cias ciau ciba cibc cibi cica cicc cici cics cicu ciia ciii ciis cis- cisa cisc ciss ciuc cius csaa csab csac csas cscb cscc csci cscs csia csib csis cssa csua csus cuau cub- cuba cubb cubi cubs cuca cucc cuci cui- cuis cusa cusb cuss cusu iaaa iaac iaai iaas iaba iaca iacc iacs iacu iaia iais iasa iasc iasi ibac ibas ibca ibcs ibia ibis ibsa ibss ibus icaa icab icac icai icas icbc icbs icca iccb iccc icci iccs iccu icis icsa icsb icsc icsi icss icub icus iiac iias iica iiii iiis iisc iisi iisu iiuc is-a isac isai isas isba isca iscc isci iscs iscu isia isic isis issa issc issi isss issu isua isus iucc iuiu iuss s-ib s-ic s-ii sa-c saab saac saas saba sabb sabc sabi sabs sabu saca sacc saci sacs sacu saia saic sais sasa sasc sasi sass saua sauc saus sbaa sbac sbai sbas sbbs sbca sbcc sbcs sbia sbic sbsa sbsi sbus scaa scab scac scai scas scba scbi sccc sccs sci- scia scic scis scsa scsc scsi scsu scua scub siaa siab siac siai sias siau siba sibc sibi sibs sibu sica sicc sici sics sicu sisa sisc sisi siss sisu siui sius ssaa ssab ssac ssas ssau ssca sscc ssci sscs ssis sssa sssb sssc sssi ssss suas sub- suba subb subi subs suc- succ suci sucs suis sus- susa susi suss susu suus uabc uaca uasa uaua ubac ubba ubbi ubic ubii ubis ucai ucas ucbc ucca ucci ucsa ucsb ucsc ucsu ucua uica us-a usaa usac usas usba usbc usbs usca uscc uscs usia usis ussa ussb ussc usss ussu usua usui usus uusi uuuu