a-ii aaaa aaab aaac aaai aaar aaba aabb aabc aabi aabt aaca aacb aacc aaci aacr aact aaib aaic aaii aara aarc aari aart aata aatc aatt abaa abab abac abai abar abat abb- abba abbb abbi abbr abbt abca abcb abcc abci abcr abct abia abib abic abir abit abra abrc abri abta ac-t acaa acab acac acai acar acat acba acca accc acci acct aci- acia acic acir acr- acra acrc acri acrr acta actc acti actt aiai aiba aica aicc aicr aiia aiib aiic aiir aira airi airt aita aiti aitr aitt arab arac arai arar arat arba arbi arc- arca arci arct aria arib arii arit arr- arra arrc arri arrr arrt arta artc arti artr at-t ataa atab atac atai atar atat atca atcc atcr atia atic atit atra atrc atri atta atti attr ba-i baaa baar baat baba babb babi babr bac- baca bacc baci bact baia baib baic bair bait bar- bara barb barc bari barr bart bata batc bati batt bbbb bbci bbrc bcaa bcar bcat bcbc bcca bccc bcci bcia bcit bcra bctc biar biat biba bibb bibi bica bicc bici bira birb biri birr birt bita bitc bitt brab brac brai brat brca brcb bria bric brit brrr brtc btaa btcc btrc btrt bttb caaa caab caac caat caba cabi cac- caca cacc caci cacr caia caib caic cair cait cara carb carc cari carr cart cat- cata catb catc cati catt cbac cbar cbat cbbc cbca cbcc cbcr cbct cbia cbir cbit cbrt cbta cbtc ccaa ccab ccac ccai ccar ccat ccba ccbc ccca cccb cccc ccci ccic ccii ccir ccra ccrc ccri ccrt cctb cctc cctt ciaa ciar ciat ciba cibc cibi cica cicc cici cicr cict ciia ciii ciit cira cirb circ ciri cirr cirt cita citb citi citt crab crac crai crar crat crbc crca crcc crcr cria crib cric crit crrt crtc ctab ctba ctbi ctca ctia ctic ctrc ctta iaaa iaac iaai iaat iaba iaca iacc iacr iact iaia iara iarc iart iata iatc iati ibac ibar ibat ibca ibia ibra ibrc ibri ibtb ibtc icaa icab icac icai icar icat icbc icca iccb iccc icci iccr icct icra icrc icrr icrt icta iiac iica iiii iiit iira iirc iita iitr iitt irac irai irar irca ircc iri- iria iric irra irrc irri irta irti itaa itac itai itar itat itia itic itra itri itta raab raat raba rabb rabi rac- raca racc raci ract raia raic raii rair rait rara rarb rari rata rati ratt rbbb rbbr rcac rcbc rccb rccc rcic rctc rcti riaa riab riai riat rib- riba rica ricc rict riia riri rita riti ritt rrat rrrr rtai rtca rtcc taa- taar taat taba tabb tabc tabi taca tacc taci tact taia tair tait tara tarb tarc tari tarr tart tata tatb tati tatr tatt tbar tbca tbcb tbcc tbit tbrb tbta tcca tccc tctc tiaa tiab tiar tiba tibi tica ticc tiit tira tirb tiri tirr tita titc titi titt traa trab trac trai trat trca trcc tri- tria trib tric trit trra trtc trtr ttab ttbb tttt