a-ii aaaa aaab aaac aaaf aaai aaar aaba aabb aabc aabi aaca aacb aacc aacf aaci aacr aafa aafb aafc aaff aafi aaib aaic aaii aara aarc aari abaa abab abac abaf abai abar abb- abba abbb abbi abbr abca abcb abcc abcf abci abcr abff abia abib abic abir abra abrc abri acaa acab acac acai acar acba acca accc accf acci acfc acfi aci- acia acic acif acir acr- acra acrc acri acrr afaa afar afca afcb afcc afci affa affc affi afia afib afif afir afr- afra afrc afri aiai aiba aica aicc aicf aicr aiff aiia aiib aiic aiir aira airi arab arac araf arai arar arba arbi arc- arca arci arfa arfb arfc arff aria arib arif arii arr- arra arrc arri arrr ba-i baaa baaf baar baba babb babi babr bac- baca bacc baci bafc baff baia baib baic bair bar- bara barb barc barf bari barr bbbb bbci bbfc bbrc bcaa bcar bcbc bcca bccc bcci bcfc bcia bcra bfca biaf biar biba bibb bibi bica bicc bici bifa biff bifi bira birb biri birr brab brac braf brai brca brcb brfc bria bric brrr caaa caab caac caaf caba cabf cabi cac- caca cacc caci cacr cafa cafb cafc caff caia caib caic cair cara carb carc carf cari carr cbac cbar cbbc cbca cbcc cbcr cbfb cbfc cbia cbir ccaa ccab ccac ccaf ccai ccar ccba ccbc ccca cccb cccc cccf ccci ccfa ccfc ccff ccfi ccic ccii ccir ccra ccrc ccrf ccri cfaa cfab cfac cfar cfbc cfbr cfca cfcb cfcf cffb cffr cfia cfra cfrb ciaa ciar ciba cibc cibi cica cicc cici cicr cifa ciff ciia ciii cira cirb circ ciri cirr crab crac craf crai crar crbc crca crcc crcr crfc cria crib cric crif faaa faac faba fabi faca facc fafa fafc faff fafi fair fara farb farc farr fbar fcab fcar fcba fcca fccf fcic fcii fcra ffar ffcc ffff ffii ffrr fiaa fiac fiaf fiar fiba fica ficc fifa fifc fiff fifi fiii fira frab frac frbc frcc frfc fria frib fric iaaa iaac iaai iaba iaca iacc iacr iafc iaff iaia iara iarc ibac ibar ibca ibfi ibia ibra ibrc ibri icaa icab icac icaf icai icar icbc icca iccb iccc iccf icci iccr icfb icra icrc icrf icrr ifaa ifac ifar ifbb ific ifra ifrb ifrf ifri iiac iica iifa iiii iira iirc irac iraf irai irar irca ircc iri- iria iric irra irrc irri raab raaf raba rabb rabi rac- raca racc raci rafa rafc raff rafi raia raic raif raii rair rara rarb rarf rari rbaf rbbb rbbr rcac rcaf rcbc rccb rccc rcfc rcic rffc rfic riaa riab riai rib- riba rica ricc rifa riff riia riif riri rrfc rrif rrrr