a-ak aaaa aaab aaac aaad aaar aaas aaba aabb aabc aabd aaca aacb aacc aacd aack aacr aacs aada aadc aads aaka aara aarc aard aars aasa aasc aasd aass abaa abab abac abad abak abar abas abb- abba abbb abbr abbs abca abcb abcc abcd abcr abcs abda abra abrc abrs abs- absa absd abss acaa acab acac acad acar acas acba acca accc accd accs acda acdb acdc acds ackd acks acr- acra acrc acrr acrs acsa acsc acsd acss adaa adab adac adad adak adar adas adba adbc adcc adcs adda addc addd addr adds adra adrs adsa adsr adss akaa akar akas akca akka akr- akra aksa arab arac arad arak arar aras arba arbs arc- arca arcs arda ardc ards arka arks arr- arra arrc arrk arrr arrs ars- arsa arsc arsd arsk asaa asab asac asad asak asar asas asba asc- asca ascb ascc ascr asda asds aska askr asks asra asrc asrs assa assc assd assk assr asss baaa baad baak baar baas baba babb babr babs bac- baca bacc back bacs bada badb badd badr bads bak- baka bakr baks bar- bara barb barc bard bark barr bars basa basc bask bass bbad bbas bbbb bbbs bbdd bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcda bcds bcra bcrs bcsa bcsc bcss bd-r bdbc bddc bdsd brab brac brad brak bras brca brcb brda brds brka brkb brrr brrs brsb brsr bsaa bsac bsas bsbd bscs bsra bsrd bssc bssd c-cd caaa caab caac caas caba cabs cac- caca cacc cack cacr cada cadc cadd cadr cads caka cara carb carc card cark carr cars casa casb casc casd cask casr cass cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbdb cbdc cbds cbka cbkr cbrd cbsa cbsc ccaa ccab ccac ccad ccar ccas ccba ccbc ccca cccb cccc cccs ccdc ccdr ccds ccra ccrc ccrs ccsa ccsd ccss cd-r cdaa cdac cdad cdba cdcs cdda cddb cddr cdrs cdss ckac ckbc ckck ckcs ckrc ckrd cksa cksb crab crac crar cras crbc crca crcc crcr crda crdc crkc crsa crss csaa csab csac csak csar csas cscb cscc cscd cscr cscs csda csdb csdr cska csks csra csrc csrd csrs cssa cssd cssr daab daad daar daas daba dabb dabs daca dacs dada dads daka daks dara darb darc dard dark darr dars dasa dasb dasc dasd dask dass dbar dbas dbcc dbcs dbrs dbsa dbss dcas dcbc dcca dccb dccc dccs dcdb dcds dcra dcrk dcsc dcss dddd ddrc ddss dkba dkdc draa drab drac drad drak drar dras drba drbc drca drda drra drrs drsa dsac dsba dsbc dscc dscr dscs dsda dsdr dsrc dsrr dssa dssc kaaa kaab kaak kaar kaas kaba kabb kabc kabd kabr kacb kacc kacd kacs kad- kada kadd kadr kads kaka kakc kakk kaks kara karb kard kark karr kars kas- kasa kasb kasc kask kasr kass kbaa kbab kbac kbad kbak kbar kbas kbba kbbb kbbc kbbd kbbk kbbr kbbs kbca kbcb kbck kbcr kbcs kbdb kbdr kbds kbkb kbkk kbkr kbra kbrb kbrc kbrd kbrk kbsa kbsb kbsk kbsr kbss kcaa kcab kcac kcad kcar kcas kcba kcbc kcbd kcbk kcbr kcbs kcca kccb kccc kccd kcck kccr kcda kcdc kcdd kcdr kcds kckc kckk kckr kcrc kcrr kcrs kcsa kcsb kcsc kcsd kcsr kcss kdaa kdab kdac kdad kdak kdar kdbb kdbr kdbs kdca kdcc kdcd kdcr kddb kddc kddd kddk kddr kdka kdkb kdkd kdkk kdkr kdrb kdrs kdsc kdsd kdsk kdsr kdss kkaa kkac kkar kkba kkbb kkbd kkbr kkbs kkcb kkcd kkck kkcr kkcs kkda kkdc kkdd kkkk kkrb kkrc kkrk kkrr kkrs kksa kksd kksr kkss krab krac krad krak krar kras krba krbb krbd krbk krbr krca krcb krcc krcd krcs krda krdc krdd krdr krds krka krkc krkd krkk krkr krks krrb krrc krrk krrr krrs krsa krsc krsd krsk krsr krss ksab ksac ksak ksar ksas ksba ksbc ksbr ksbs ksca kscb ksck kscr kscs ksdc ksdk ksdr ksds kska kskb kskd kskk kskr ksks ksra ksrb ksrr ksrs kssa kssr ksss raab raad raak raas raba rabb rabk rabs rac- raca racc rack racs rada radc radd radr rads raka rakk rara rarb rark rars rasa rasc rasd rask rass rbbb rbbr rbbs rbds rbsd rbss rcac rcas rcbc rccb rccc rccs rcdc rcds rcrd rcsa rcsc rcsd rcss rdac rdas rkss rrad rras rrrr rsaa rscc rscs rsdd rsds rssa sa-c saab saac saad saak saar saas saba sabb sabc sabr sabs saca sacc sacd sack sacr sacs sada sadb sadc sadd sadr sads saka sakb sakk saks sara sarc sard sark sarr sars sasa sasc sasd sask sass sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbds sbrk sbsa sbsd scaa scab scac scad scak scar scas scba sccc sccs scda scdc scds sck- scr- scra scrc scrs scsa scsc scsd scsr sdak sdba sdcc sddc sdds sdrc sdrs sdsc sdss skab skac skad skar skra sksd skss sras srbc srcc srsd ssaa ssab ssac ssas ssbr ssca sscc sscs ssdc ssdd ssra ssrc ssrs sssa sssb sssc ssss