a-ii aaaa aaab aaac aaad aaai aaba aabb aabc aabd aabi aabt aaca aacb aacc aacd aaci aact aada aadc aadi aadt aaib aaic aaii aata aatc aatt abaa abab abac abad abai abat abb- abba abbb abbi abbt abca abcb abcc abcd abci abct abda abdi abia abib abic abid abit abta ac-t acaa acab acac acad acai acat acba acca accc accd acci acct acda acdb acdc acdi acdt aci- acia acic acid acta actc acti actt adaa adab adac adad adai adat adba adbc adbi adcc adci adda addc addd addi adia adib adic adit adta aiai aiba aica aicc aicd aida aidb aidc aidi aidt aiia aiib aiic aiid aita aiti aitt at-t ataa atab atac atad atai atat atca atcc atdi atdt atia atic atid atit atta atti ba-i baaa baad baat baba babb babi bac- baca bacc baci bact bada badb badd badi baia baib baic baid bait bata batc bati batt bbad bbbb bbci bbdd bcaa bcat bcbc bcca bccc bcci bcda bcia bcit bctc bdbc bddc bdii biad biat biba bibb bibi bica bicc bici bida bidi bita bitc bitd bitt btaa btcc btdt bttb c-cd caaa caab caac caat caba cabi cac- caca cacc caci cada cadc cadd cadi caia caib caic caid cait cat- cata catb catc catd cati catt cbac cbat cbbc cbca cbcc cbct cbdb cbdc cbdi cbia cbid cbit cbta cbtc ccaa ccab ccac ccad ccai ccat ccba ccbc ccca cccb cccc ccci ccdc ccdi ccic ccid ccii cctb cctc cctt cdaa cdac cdad cdai cdba cdda cddb cdic cdii ciaa ciat ciba cibc cibi cica cicc cici cict cida cidc cidi cidt ciia ciid ciii ciit cita citb citi citt ctab ctba ctbi ctca ctia ctic ctta daab daad daba dabb dabt daca daci dact dada dadi daia daid dait data dati datt dbcc dbit dbtt dcbc dcca dccb dccc dcci dcct dcdb dcia dcii dctc dddd dia- diab diac diad diat diba dibb dica dici dict dida didi diii dita diti ditt dtaa dtac dtcc iaaa iaac iaai iaat iaba iaca iacc iact iadb iadc iadt iaia iata iatc iati ibac ibad ibat ibca ibia ibid ibtb ibtc icaa icab icac icad icai icat icbc icbd icca iccb iccc icci icct icdc icdd icta idad idat idca idda idia idic idid idta iiac iica iicd iida iiii iiit iita iitt itaa itac itai itat itia itic itta taa- taat taba tabb tabc tabi taca tacc taci tact tada taia tait tata tatb tati tatt tbca tbcb tbcc tbcd tbit tbta tcad tcca tccc tcdd tctc tdac tddb tiaa tiab tiba tibi tica ticc tidc tidd tiit tita titc titi titt ttab ttbb tttt