a-ii aaaa aaab aaac aaai aaar aaba aabb aabc aabi aaca aacb aacc aaci aacr aaib aaic aaii aara aarc aari abaa abab abac abai abar abb- abba abbb abbi abbr abca abcb abcc abci abcr abia abib abic abir abra abrc abri acaa acab acac acai acar acba acca accc acci aci- acia acic acir acr- acra acrc acri acrr aiai aiba aica aicc aicr aiia aiib aiic aiir aira airi arab arac arai arar arba arbi arc- arca arci aria arib arii arr- arra arrc arri arrr ba-i baaa baar baba babb babi babr bac- baca bacc baci baia baib baic bair bar- bara barb barc bari barr bbbb bbci bbrc bcaa bcar bcbc bcca bccc bcci bcia bcra biar biba bibb bibi bica bicc bici bira birb biri birr brab brac brai brca brcb bria bric brrr caaa caab caac caba cabi cac- caca cacc caci cacr caia caib caic cair cara carb carc cari carr cbac cbar cbbc cbca cbcc cbcr cbia cbir ccaa ccab ccac ccai ccar ccba ccbc ccca cccb cccc ccci ccic ccii ccir ccra ccrc ccri ciaa ciar ciba cibc cibi cica cicc cici cicr ciia ciii cira cirb circ ciri cirr crab crac crai crar crbc crca crcc crcr cria crib cric iaaa iaac iaai iaba iaca iacc iacr iaia iara iarc ibac ibar ibca ibia ibra ibrc ibri icaa icab icac icai icar icbc icca iccb iccc icci iccr icra icrc icrr iiac iica iiii iira iirc irac irai irar irca ircc iri- iria iric irra irrc irri raab raba rabb rabi rac- raca racc raci raia raic raii rair rara rarb rari rbbb rbbr rcac rcbc rccb rccc rcic riaa riab riai rib- riba rica ricc riia riri rrrr