a-ak aaaa aaab aaac aaaf aaas aaba aabb aabc aabt aaca aacb aacc aacf aack aacs aact aafa aafb aafc aaff aaka aasa aasc aasf aass aast aata aatc aatf aatk aatt abaa abab abac abaf abak abas abat abb- abba abbb abbs abbt abca abcb abcc abcf abcs abct abff abs- absa absf abss abta abts ac-t acaa acab acac acas acat acba acca accc accf accs acct acfc acfs acft acks acsa acsc acss acst acta actc actf acts actt afaa afak afat afbs afca afcb afcc afcs affa affc affs afft afka afsa afsb afsc afst afta aftc afts akaa akas akca akka aksa akst asaa asab asac asaf asak asas asat asba asc- asca ascb ascc asct asfa aska asks askt assa assc assk asss asst asta astb astc asts at-t ataa atab atac atak atas atat atbs atca atcc atcf atck atcs atfb atfc atfs atka atkt atsb atsc atst atta atts baaa baaf baak baas baat baba babb babs bac- baca bacc back bacs bact bafc baff baft bak- baka baks bakt basa basc basf bask bass bast bata batc batf bats batt bbas bbbb bbbs bbfc bcaa bcas bcat bcbc bcbs bcca bccc bccs bcfc bcsa bcsc bcss bctc bcts bfas bfca bfcs bffs bfta bfts bftt bsaa bsac bsas bsat bscs bsfa bsfc bsff bsfs bskt bssc bsts btaa btaf btcc btcs btfc btss bttb caaa caab caac caaf caas caat caba cabf cabs cac- caca cacc cack cafa cafb cafc caff cafs caka casa casb casc cask cass cast cat- cata catb catc catf cats catt cbac cbat cbbc cbbs cbca cbcc cbcs cbct cbfb cbfc cbka cbsa cbsc cbta cbtc cbtf ccaa ccab ccac ccaf ccas ccat ccba ccbc ccca cccb cccc cccf cccs ccfa ccfc ccff ccsa ccsf ccss ccst cctb cctc cctt cfaa cfab cfac cfbc cfbs cfbt cfca cfcb cfcf cfcs cffb cfsa cfta cftc cftk ckac ckat ckbc ckck ckcs cksa cksb ckst cktb ckts csaa csab csac csak csas csat csbf cscb cscc cscf cscs csfc cska csks cssa csta cstc csts ctab ctba ctbs ctca ctcf ctfc ctfs ctsa ctsc ctss ctta ctts f--k faaa faac faas faba fabs faca facc fack facs fact fafa fafc faff fakt fasa fasc fass fast fata fatc fatf fats fatt fcab fcas fcat fcba fcbs fcca fccf fcsc fcst ffcc ffff ffsa ffss fftf fkab fsas fscb fscc fsck fssa fssc fssf fsta ft-c ftfc ftsa kaaa kaab kaaf kaak kaas kaat kaba kabb kabc kabf kacb kacc kacs kact kafa kafc kaff kafs kaka kakc kakk kaks kakt kas- kasa kasb kasc kasf kask kass kast kat- kata katb katc katf katk kats katt kbaa kbab kbac kbak kbas kbat kbba kbbb kbbc kbbf kbbk kbbs kbbt kbca kbcb kbck kbcs kbct kbfb kbfc kbff kbfk kbfs kbft kbkb kbkf kbkk kbsa kbsb kbsk kbss kbst kbta kbtb kbtc kbtf kbtk kbts kbtt kcaa kcab kcac kcas kcat kcba kcbc kcbf kcbk kcbs kcca kccb kccc kcck kcct kcfa kcfb kcfc kcft kckc kckf kckk kcsa kcsb kcsc kcsf kcss kcst kcta kctb kctc kfab kfac kfat kfbc kfbk kfbt kfcf kfcs kffa kffb kfff kffk kfka kfkb kfsa kfsk kfst kfta kftc kftk kftt kkaa kkac kkat kkba kkbb kkbs kkbt kkcb kkck kkcs kkct kkfs kkft kkkk kksa kksf kkss kkst kktc kktk kkts ksab ksac ksaf ksak ksas ksat ksba ksbc ksbs ksca kscb ksck kscs ksfa ksfb ksfc ksft kska kskb kskf kskk ksks kssa ksss ksst ksta kstb kstc kstk ksts kstt ktaa ktak ktas ktat ktba ktbb ktbc ktbt ktcc ktck ktcs ktfb ktfc ktfs ktkb ktkc ktkk ktks ktkt ktsa ktsc ktsf ktst kttc kttf kttk ktts kttt sa-c saab saac saaf saak saas saat saba sabb sabc sabs saca sacc sack sacs sact safa safb safc saff saft saka sakb sakk saks sasa sasc sasf sask sass sast sata satb satc sats satt sbaa sbac sbas sbbs sbca sbcc sbcs sbct sbfc sbsa sbst sbtc sbtk scaa scab scac scaf scak scas scat scba sccc sccs scct scfa scfc sck- scsa scsc scst sctc scts sfas sfba sfbc sfca sfcc sfcs sffc sfss sfts skab skac skaf skat skfc skss ssaa ssab ssac ssas ssat ssca sscc sscs ssfc sssa sssb sssc sssf ssss ssta sstb sstc ssts stab stac stak stas stat stbc stbs stca stcc stcs stfc stks stsf stss sttc taa- taaf taas taat taba tabb tabc tabs taca tacc tack tacs tact tafa tafc taff taft taka takk taks takt tasa tasb tasc task tass tast tata tatb tats tatt tbaf tbas tbbs tbca tbcb tbcc tbst tbta tcbs tcca tccc tcfc tctc tcts tfca tfss tftc tkac tkts tsaa tsat tsbc tsca tscc tsfc tsks tssa tssf tsst tstc tsts ttab ttbb ttfa ttfc ttff ttss tttt