a-ii aaaa aaab aaac aaad aaai aaap aaar aaba aabb aabc aabd aabi aabp aaca aacb aacc aacd aaci aacp aacr aada aadc aadi aaib aaic aaii aapa aapc aapi aara aarc aard aari aarp abaa abab abac abad abai abap abar abb- abba abbb abbi abbr abca abcb abcc abcd abci abcp abcr abda abdi abia abib abic abid abir abpa abpc abpd abpi abpp abpr abra abrc abri acaa acab acac acad acai acap acar acba acca accc accd acci accp acda acdb acdc acdi acdp aci- acia acic acid acip acir acpa acpd acpi acpr acr- acra acrc acri acrr adaa adab adac adad adai adap adar adba adbc adbi adcc adci adda addc addd addi addr adia adib adic adip adir adp- adra aiai aiba aica aicc aicd aicp aicr aida aidb aidc aidi aidr aiia aiib aiic aiid aiir aipa aipi aira aird airi airp apac apai apap apar apba apbr apca apcb apcc apcd apcr apda apdd api- apia apic apid apip appa appc appd appr apra aprc apri arab arac arad arai arap arar arba arbi arc- arca arci arda ardc ardi aria arib arid arii arip arpa arpi arr- arra arrc arri arrr ba-i baaa baad baar baba babb babi babr bac- baca bacc baci bada badb badd badi badr baia baib baic baid bair bapa bapc bapi bapp bar- bara barb barc bard bari barr bbad bbbb bbci bbdd bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcci bcda bcia bcpp bcra bd-r bdbc bddc bdii bdpc biad biap biar biba bibb bibi bica bicc bici bida bidi bidr bipa bipp bira birb bird biri birr bpai bpcp bpda bprc bprd brab brac brad brai brca brcb brda bria bric brid brrr c-cd caaa caab caac caap caba cabi cac- caca cacc caci cacr cada cadc cadd cadi cadr caia caib caic caid caip cair capa capb capc capd capi capp cara carb carc card cari carp carr cbac cbar cbbc cbca cbcc cbcp cbcr cbdb cbdc cbdi cbia cbid cbir cbpc cbpp cbrd ccaa ccab ccac ccad ccai ccap ccar ccba ccbc ccca cccb cccc ccci cccp ccdc ccdi ccdp ccdr ccic ccid ccii ccip ccir ccpa ccpp ccpr ccra ccrc ccri ccrp cd-r cdaa cdac cdad cdai cdba cdda cddb cddr cdic cdii ciaa ciar ciba cibc cibi cica cicc cici cicr cida cidc cidi cidp cidr ciia ciid ciii cipa cipp cira cirb circ ciri cirr cpaa cpac cpad cpap cpbc cpca cpia cpic cppa cppd cpri crab crac crai crap crar crbc crca crcc crcr crda crdc cria crib cric crip crpc daab daad daap daar daba dabb dabp daca daci dada dadi daia daid dair dapa dapi dapp dara darb darc dard dari darp darr dbar dbcc dbcp dbpc dbpd dcbc dcca dccb dccc dcci dccp dcdb dcia dcii dcra dddd ddrc dia- diab diac diad diap diar diba dibb dibp dica dici dida didi diii dipa dipc dipp dira dird dirr dpaa dpac dpbc dpci dpcp dppa dppc draa drab drac drad drap drar drba drbc drca drda drib dric drip drra iaaa iaac iaai iaap iaba iaca iacc iacp iacr iadb iadc iaia iapa iapp iara iarc ibac ibad ibar ibca ibia ibid ibra ibrc ibrd ibri icaa icab icac icad icai icap icar icbc icbd icbp icca iccb iccc icci iccp iccr icdc icdd icdp icpa icpc icpd icra icrc icrr idad idar idca idcr idda idia idic idid idir idra idrc iiac iica iicd iida iiii iipa iira iirc ipac ipad ipba ipca ipcc ipdc ipdi ipid ippa ippc ippr ipri irac irad irai irap irar irbp irca ircc ircd irda irdc irdp iri- iria iric irid irip irpa irpc irra irrc irri paap paar paba paca pacd paci pada padd padi paia paib paid paip pair papa papb papi papp papr par- para parc pard pari parp parr pbac pbar pbcc pbpa pcaa pcad pcap pcba pcbc pcca pccc pcia pcip pcpb pcpp pcra pcrc pcrd pdac pdca pdci pdcp pdic pdpa pdpr pdrc piai pibb pibi pica picc pici picr pida piia piip pipa pipi pipp pira pirc piri pirr ppac ppad ppap ppar ppcc ppcd ppci ppib ppic ppid pppa pppd pppp pprc prad prai prar prbc prca prcc prcd prcp pri- pria prid prii prpd prrd prri raab raad raba rabb rabi rac- raca racc raci rada radc radd radr raia raic raid raii raip rair rapa rapc rapd rapi rapp rara rarb rari rbbb rbbr rcac rcbc rccb rccc rcdc rcic rcid rcpd rcpi rcrd rdac rdap rdbp rdpc riaa riab riad riai rib- riba rica ricc rida ridc ridd ridi riia ripa ripd ripi ripp ripr riri rpca rpdp rpii rrad rrrr