-vac a-ak aaaa aaab aaac aaas aaav aaba aabb aabc aaca aacb aacc aack aacs aacv aaka aasa aasc aass aava abaa abab abac abak abas abb- abba abbb abbs abca abcb abcc abcs abs- absa abss abva acaa acab acac acas acba acca accc accs acks acsa acsc acss acvs acvv akaa akas akca akka aksa asaa asab asac asak asas asba asc- asca ascb ascc aska asks assa assc assk asss asva asvs avab avas avcc avva baaa baak baas baba babb babs bac- baca bacc back bacs bak- baka baks basa basc bask bass bava bbas bbbb bbbs bcaa bcas bcbc bcbs bcca bccc bccs bcsa bcsc bcss bsaa bsac bsas bscs bssc bvsc caaa caab caac caas caba cabs cac- caca cacc cack caka casa casb casc cask cass cava cavs cbac cbbc cbbs cbca cbcc cbcs cbka cbsa cbsc cbva cbvb ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccs cccv ccsa ccss ccvs ckac ckbc ckck ckcs ckcv cksa cksb csaa csab csac csak csas csav cscb cscc cscs cska csks cssa cvac cvas cvbs cvca cvcc cvss kaaa kaab kaak kaas kaba kabb kabc kacb kacc kacs kacv kaka kakc kakk kaks kas- kasa kasb kasc kask kass kava kavb kavs kavv kbaa kbab kbac kbak kbas kbba kbbb kbbc kbbk kbbs kbca kbcb kbck kbcs kbkb kbkk kbkv kbsa kbsb kbsk kbss kbsv kbva kbvb kbvc kcaa kcab kcac kcas kcav kcba kcbc kcbk kcbs kcca kccb kccc kcck kccv kckc kckk kckv kcsa kcsb kcsc kcss kcvk kcvs kcvv kkaa kkac kkba kkbb kkbs kkcb kkck kkcs kkkk kksa kkss kkvv ksab ksac ksak ksas ksav ksba ksbc ksbs ksbv ksca kscb ksck kscs kscv kska kskb kskk ksks kssa ksss ksva ksvc kvab kvak kvas kvbc kvcb kvcc kvck kvcs kvcv kvsa kvsc kvss kvsv kvvs kvvv sa-c saab saac saak saas saba sabb sabc sabs saca sacc sack sacs saka sakb sakk saks sasa sasc sask sass sava savs sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scak scas scba sccc sccs sck- scsa scsc skab skac skss ssaa ssab ssac ssas ssca sscc sscs sssa sssb sssc ssss svcc svcs svsc vaas vabs vaca vack vacs vaka vas- vasa vass vava vavs vbcc vssc vvsb vvvv