a-be a-ii aaaa aaab aaac aaae aaaf aaai aaar aaba aabb aabc aabi aaca aacb aacc aace aacf aaci aacr aaea aaec aafa aafb aafc aaff aafi aaib aaic aaii aara aarc aare aari abaa abab abac abae abaf abai abar abb- abba abbb abbe abbi abbr abca abcb abcc abcf abci abcr abec abee aber abff abia abib abic abie abir abra abrc abri acaa acab acac acae acai acar acba acca accc acce accf acci ace- acea acec acer acfc acfe acfi aci- acia acic acie acif acir acr- acra acrc acre acri acrr aeac aeaf aebi aecb aeci aeer aer- aera aerc aeri afaa afar afca afcb afcc afci afee afer affa affc affi afia afib afif afir afr- afra afrc afre afri aiai aiba aica aicc aice aicf aicr aiea aiee aiff aiia aiib aiic aiir aira aire airi arab arac arae araf arai arar arba arbe arbi arc- arca arce arci area arec aree aref arei arfa arfb arfc arff aria arib arie arif arii arr- arra arrc arre arri arrr ba-i baaa baaf baar baba babb babe babi babr bac- baca bacc bace baci baer bafc baff baia baib baic baie bair bar- bara barb barc bare barf bari barr bbbb bbci bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcci bcec bcer bcfc bcia bcie bcra beaf bear beba bebb bebe bebi beca beci beeb beef beer befa befe beff beia beic beir bera berc bere beri berr bfca biaf biar biba bibb bibe bibi bica bicc bice bici bieb bief bier bifa biff bifi bira birb bire biri birr brab brac brae braf brai brca brcb brce brea breb brec bree bref brei brer brfc bria bric brie brrr caaa caab caac caaf caba cabe cabf cabi cac- caca cacc cace caci cacr caec caei caer cafa cafb cafc cafe caff caia caib caic cair cara carb carc care carf cari carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cbef cber cbfb cbfc cbia cbir cbre ccaa ccab ccac ccaf ccai ccar ccba ccbc ccca cccb cccc cccf ccci ccee ccfa ccfc ccff ccfi ccic ccii ccir ccra ccrc ccre ccrf ccri ceac cear ceba cec- ceca cece ceci ceeb ceec cef- cefa cefc cer- cera cerc cere cerf ceri cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cffb cffr cfia cfra cfrb cfre ciaa ciar ciba cibc cibe cibi cica cicc cici cicr ciee cier cifa cife ciff ciia ciii cira cirb circ cire ciri cirr crab crac craf crai crar crbc crca crcc crce crcr cre- crea creb crec cree crei crfc cria crib cric crie crif eaaf eaba eaca eacc eaec eafb eaif eara earb eare ebac ebba ebbc ebbr ebcc eber ebfc ebic ecaa ecac ecai ecar ecbc ecbe ecca eccb eccc ecce ecci ecef ecfa ecfc ecfr ecib ecra ecrc ecrf ecri ecrr eeca eeea eeee eefa eefe eera eerc efab efbr efca effa effi efic eica eiec eiei eier eira eire eraf erba erbb erbe erca ercc erce ereb erec erei erer erfc eria eric erie erra errc erre faaa faac faba fabe fabi faca facc face faeb fafa fafc fafe faff fafi faie fair fara farb farc fare farr fbar fcab fcar fcba fcca fccf fcic fcii fcra feaf fear feba fece feeb feer fefc fefe feff fefi feia feie feir fera ferb ferc fere ferr ffar ffcc ffee ffff ffii ffrr fiaa fiac fiaf fiar fiba fibe fica ficc fice fiec fief fier fifa fifc fife fiff fifi fiii fira fire frab frac frae frbc frcc frea free frei frfc fria frib fric frie i-be iaaa iaac iaai iaba iaca iacc iacr iaea iaec iafc iafe iaff iaia iara iarc iare ibac ibar ibca ibea ibec ibfi ibia ibie ibra ibrc ibri icaa icab icac icaf icai icar icbc icca iccb iccc iccf icci iccr icea icec icee icef icer icfb icra icrc icre icrf icrr ieac iecc ieie iera iere ieri ifaa ifac ifae ifar ifbb ifer ific ifra ifrb ifrf ifri iiac iica iifa iiie iiii iira iirc irac irae iraf irai irar irbe irca ircc iree irer irfe iri- iria iric irie irra irrc irre irri raab raaf raba rabb rabe rabi rac- raca racc race raci raec raef raer rafa rafc rafe raff rafi raia raic raie raif raii rair rara rarb rare rarf rari rbaf rbbb rbbr rcac rcaf rcbc rccb rccc rcfc rcic rea- reac reae reaf rear reba rebb rebe reca recc rece reci recr reeb reef refe reff refi refr reia reif reii reir rera rere reri rfae rfef rffc rfic riaa riab riai rib- riba ribe rica ricc rice rief rier rifa rife riff riia riif rire riri rrfc rrif rrrr