a-ak aaaa aaab aaac aaas aaba aabb aabc aaca aacb aacc aack aacs aacu aaka aaku aasa aasc aass aasu aaus abaa abab abac abak abas abau abb- abba abbb abbs abca abcb abcc abcs abs- absa abss absu abua abuk abus acaa acab acac acas acba acca accc accs accu acks acsa acsc acss acu- acus akaa akas akca akka akku aksa aksu akua asaa asab asac asak asas asau asba asbu asc- asca ascb ascc aska asks assa assc assk asss assu asub asus auaa auca auks ausa ausu baaa baak baas baba babb babs babu bac- baca bacc back bacs bak- baka baks baku basa basc bask bass basu bau- bauk bbas bbau bbbb bbbs bcaa bcas bcbc bcbs bcca bccc bccs bcsa bcsc bcss bcuc bsaa bsac bsas bscs bssc buba bubb bubs bubu buca bucc buck bucs bucu buka bukk buku busa busc busk buss busu buus caaa caab caac caas caba cabs cabu cac- caca cacc cack caka casa casb casc cask cass casu cauc cauk caus cbac cbbc cbbs cbca cbcc cbcs cbcu cbka cbsa cbsc cbus ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccs cccu ccsa ccss ccuc ccus ckac ckbc ckck ckcs cksa cksb csaa csab csac csak csas cscb cscc cscs cska csks cssa csua csus cuau cub- cuba cubb cubs cuca cucc cuck cuk- cuka cusa cusb cusk cuss cusu kaaa kaab kaak kaas kaba kabb kabc kabu kacb kacc kacs kacu kaka kakc kakk kaks kaku kas- kasa kasb kasc kask kass kasu kau- kaub kauc kauk kaus kbaa kbab kbac kbak kbas kbba kbbb kbbc kbbk kbbs kbbu kbca kbcb kbck kbcs kbcu kbkb kbkk kbsa kbsb kbsk kbss kbsu kbua kbub kbuc kbuk kbus kbuu kcaa kcab kcac kcas kcau kcba kcbc kcbk kcbs kcbu kcca kccb kccc kcck kccu kckc kckk kcsa kcsb kcsc kcss kcsu kcua kcub kcuk kkaa kkac kkba kkbb kkbs kkcb kkck kkcs kkkk kksa kkss kksu kkua kkus kkuu ksab ksac ksak ksas ksau ksba ksbc ksbs ksca kscb ksck kscs kscu kska kskb kskk ksks ksku kssa ksss kssu ksua ksub ksuu kuac kuau kuba kubb kubc kubs kubu kuca kucb kucc kuka kukk kuks kuku kusa kusb kusc kusu kuub kuuk kuuu sa-c saab saac saak saas saba sabb sabc sabs sabu saca sacc sack sacs sacu saka sakb sakk saks saku sasa sasc sask sass saua sauc sauk saus sbaa sbac sbas sbbs sbca sbcc sbcs sbsa sbus scaa scab scac scak scas scba sccc sccs sck- scsa scsc scsu scua scub skab skac skss skua ssaa ssab ssac ssas ssau ssca sscc sscs sssa sssb sssc ssss suas sub- suba subb subs suc- succ suck sucs suka suks suku sus- susa susk suss susu suus uabc uaca uasa uaua ubac ubba ucak ucas ucbc ucca ucka ucsa ucsb ucsc ucsu ucua ukba ukcc uksa uksc us-a us-k usaa usac usak usas usba usbc usbs usca uscc uscs uska ussa ussb ussc usss ussu usua usus uuuu