a-ii aaaa aaab aaac aaai aaap aaar aaba aabb aabc aabi aabp aaca aacb aacc aaci aacp aacr aaib aaic aaii aapa aapc aapi aara aarc aari aarp abaa abab abac abai abap abar abb- abba abbb abbi abbr abca abcb abcc abci abcp abcr abia abib abic abir abpa abpc abpi abpp abpr abra abrc abri acaa acab acac acai acap acar acba acca accc acci accp aci- acia acic acip acir acpa acpi acpr acr- acra acrc acri acrr aiai aiba aica aicc aicp aicr aiia aiib aiic aiir aipa aipi aira airi airp apac apai apap apar apba apbr apca apcb apcc apcr api- apia apic apip appa appc appr apra aprc apri arab arac arai arap arar arba arbi arc- arca arci aria arib arii arip arpa arpi arr- arra arrc arri arrr ba-i baaa baar baba babb babi babr bac- baca bacc baci baia baib baic bair bapa bapc bapi bapp bar- bara barb barc bari barr bbbb bbci bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcci bcia bcpp bcra biap biar biba bibb bibi bica bicc bici bipa bipp bira birb biri birr bpai bpcp bprc brab brac brai brca brcb bria bric brrr caaa caab caac caap caba cabi cac- caca cacc caci cacr caia caib caic caip cair capa capb capc capi capp cara carb carc cari carp carr cbac cbar cbbc cbca cbcc cbcp cbcr cbia cbir cbpc cbpp ccaa ccab ccac ccai ccap ccar ccba ccbc ccca cccb cccc ccci cccp ccic ccii ccip ccir ccpa ccpp ccpr ccra ccrc ccri ccrp ciaa ciar ciba cibc cibi cica cicc cici cicr ciia ciii cipa cipp cira cirb circ ciri cirr cpaa cpac cpap cpbc cpca cpia cpic cppa cpri crab crac crai crap crar crbc crca crcc crcr cria crib cric crip crpc iaaa iaac iaai iaap iaba iaca iacc iacp iacr iaia iapa iapp iara iarc ibac ibar ibca ibia ibra ibrc ibri icaa icab icac icai icap icar icbc icbp icca iccb iccc icci iccp iccr icpa icpc icra icrc icrr iiac iica iiii iipa iira iirc ipac ipba ipca ipcc ippa ippc ippr ipri irac irai irap irar irbp irca ircc iri- iria iric irip irpa irpc irra irrc irri paap paar paba paca paci paia paib paip pair papa papb papi papp papr par- para parc pari parp parr pbac pbar pbcc pbpa pcaa pcap pcba pcbc pcca pccc pcia pcip pcpb pcpp pcra pcrc piai pibb pibi pica picc pici picr piia piip pipa pipi pipp pira pirc piri pirr ppac ppap ppar ppcc ppci ppib ppic pppa pppp pprc prai prar prbc prca prcc prcp pri- pria prii prri raab raba rabb rabi rac- raca racc raci raia raic raii raip rair rapa rapc rapi rapp rara rarb rari rbbb rbbr rcac rcbc rccb rccc rcic rcpi riaa riab riai rib- riba rica ricc riia ripa ripi ripp ripr riri rpca rpii rrrr