a-be a-ii aaaa aaab aaac aaae aaai aaar aaba aabb aabc aabi aaca aacb aacc aace aaci aacr aaea aaec aaib aaic aaii aara aarc aare aari abaa abab abac abae abai abar abb- abba abbb abbe abbi abbr abca abcb abcc abci abcr abec abee aber abia abib abic abie abir abra abrc abri acaa acab acac acae acai acar acba acca accc acce acci ace- acea acec acer aci- acia acic acie acir acr- acra acrc acre acri acrr aeac aebi aecb aeci aeer aer- aera aerc aeri aiai aiba aica aicc aice aicr aiea aiee aiia aiib aiic aiir aira aire airi arab arac arae arai arar arba arbe arbi arc- arca arce arci area arec aree arei aria arib arie arii arr- arra arrc arre arri arrr ba-i baaa baar baba babb babe babi babr bac- baca bacc bace baci baer baia baib baic baie bair bar- bara barb barc bare bari barr bbbb bbci bbeb bbrc bcaa bcar bcbc bcca bccc bcci bcec bcer bcia bcie bcra bear beba bebb bebe bebi beca beci beeb beer beia beic beir bera berc bere beri berr biar biba bibb bibe bibi bica bicc bice bici bieb bier bira birb bire biri birr brab brac brae brai brca brcb brce brea breb brec bree brei brer bria bric brie brrr caaa caab caac caba cabe cabi cac- caca cacc cace caci cacr caec caei caer caia caib caic cair cara carb carc care cari carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbia cbir cbre ccaa ccab ccac ccai ccar ccba ccbc ccca cccb cccc ccci ccee ccic ccii ccir ccra ccrc ccre ccri ceac cear ceba cec- ceca cece ceci ceeb ceec cer- cera cerc cere ceri ciaa ciar ciba cibc cibe cibi cica cicc cici cicr ciee cier ciia ciii cira cirb circ cire ciri cirr crab crac crai crar crbc crca crcc crce crcr cre- crea creb crec cree crei cria crib cric crie eaba eaca eacc eaec eara earb eare ebac ebba ebbc ebbr ebcc eber ebic ecaa ecac ecai ecar ecbc ecbe ecca eccb eccc ecce ecci ecib ecra ecrc ecri ecrr eeca eeea eeee eera eerc eica eiec eiei eier eira eire erba erbb erbe erca ercc erce ereb erec erei erer eria eric erie erra errc erre i-be iaaa iaac iaai iaba iaca iacc iacr iaea iaec iaia iara iarc iare ibac ibar ibca ibea ibec ibia ibie ibra ibrc ibri icaa icab icac icai icar icbc icca iccb iccc icci iccr icea icec icee icer icra icrc icre icrr ieac iecc ieie iera iere ieri iiac iica iiie iiii iira iirc irac irae irai irar irbe irca ircc iree irer iri- iria iric irie irra irrc irre irri raab raba rabb rabe rabi rac- raca racc race raci raec raer raia raic raie raii rair rara rarb rare rari rbbb rbbr rcac rcbc rccb rccc rcic rea- reac reae rear reba rebb rebe reca recc rece reci recr reeb reia reii reir rera rere reri riaa riab riai rib- riba ribe rica ricc rice rier riia rire riri rrrr