-ana a-un aaaa aaab aaac aaan aaas aaba aabb aabc aaca aacb aacc aacn aacs aacu aana aasa aasc aass aasu aaus abaa abab abac aban abas abau abb- abba abbb abbs abca abcb abcc abcn abcs abnu abs- absa abss absu abua abun abus acaa acab acac acan acas acba acca accc accs accu acsa acsc acss acu- acus ana- anaa anab anac anan anas anau anba anbb anbu anca ancc anna annb anns ansa ansu anua anub anun anus asaa asab asac asan asas asau asba asbu asc- asca ascb ascc asnc assa assc assn asss assu asub asun asus auaa auca auna ausa ausu baaa baan baas baba babb babs babu bac- baca bacc bacn bacs bana banc bann bans banu basa basc bass basu bau- bbas bbau bbbb bbbs bcaa bcas bcbc bcbs bcca bccc bccs bcnu bcsa bcsc bcsn bcss bcuc bnas bnss bsaa bsac bsas bscs bsns bssc buba bubb bubs bubu buca bucc bucs bucu buna bunb bunn buns bunu busa busc buss busu buus caaa caab caac caan caas caba cabs cabu cac- caca cacc cana canc cann cans casa casb casc cass casu cauc caus cbac cbbc cbbs cbca cbcc cbcn cbcs cbcu cbna cbsa cbsc cbsn cbus ccaa ccab ccac ccas ccba ccbc ccbn ccca cccb cccc cccs cccu ccna ccnb ccnc ccns ccnu ccsa ccsn ccss ccuc ccus cnaa cnac cnas cnbc cnna cnsa cnss csaa csab csac csas cscb cscc cscs cssa csua csus cuan cuau cub- cuba cubb cubs cuca cucc cucn cuna cusa cusb cuss cusu naaa naab naac naan naas naba nabc nabs nabu naca nacc nacs nan- nana nanb nann nans nanu nas- nasa nasb nasc nass nasu naus nbaa nbas nbbc nbca nbcc nbcs ncaa ncac ncba ncbc ncbs ncca nccc nccn nccs nccu ncna ncnc ncsa ncsc ncss ncua nnnn nnsa nnss nsaa nsac nsca nscc nscs nsna nssa nssb nssc nsss nsub nuan nuba nubc nubs nuca nucs nucu nuna nunc nunn nuns nuss nusu sa-c saab saac saan saas saba sabb sabc sabs sabu saca sacc sacn sacs sacu sana sann sans sanu sasa sasc sass saua sauc saun saus sbaa sbac sbas sbbs sbca sbcc sbcs sbsa sbus scaa scab scac scan scas scba sccc sccs scna scsa scsc scsn scsu scua scub scun snab snas snba snca sncc snns snub snus ssaa ssab ssac ssan ssas ssau ssbn ssca sscc sscs ssns sssa sssb sssc ssss suan suas sub- suba subb subs suc- succ sucs sun- suna sunb sunn suns sunu sus- susa suss susu suus uabc uaca uasa uaua ubac ubba ucan ucas ucbc ucca ucsa ucsb ucsc ucsu ucua unaa unac unan unas unau unca uncc uncs unna unns uns- unsa unsc unus us-a usaa usac usan usas usba usbc usbs usca uscc uscs usna usnc usnu ussa ussb ussc usss ussu usua usun usus uuuu