-ana a-un aaaa aaab aaac aaan aaba aabb aabc aaca aacb aacc aacn aacu aana abaa abab abac aban abau abb- abba abbb abca abcb abcc abcn abnu abua abun acaa acab acac acan acba acca accc accu acu- ana- anaa anab anac anan anau anba anbb anbu anca ancc anna annb anua anub anun auaa auca auna baaa baan baba babb babu bac- baca bacc bacn bana banc bann banu bau- bbau bbbb bcaa bcbc bcca bccc bcnu bcuc buba bubb bubu buca bucc bucu buna bunb bunn bunu caaa caab caac caan caba cabu cac- caca cacc cana canc cann cauc cbac cbbc cbca cbcc cbcn cbcu cbna ccaa ccab ccac ccba ccbc ccbn ccca cccb cccc cccu ccna ccnb ccnc ccnu ccuc cnaa cnac cnbc cnna cuan cuau cub- cuba cubb cuca cucc cucn cuna naaa naab naac naan naba nabc nabu naca nacc nan- nana nanb nann nanu nbaa nbbc nbca nbcc ncaa ncac ncba ncbc ncca nccc nccn nccu ncna ncnc ncua nnnn nuan nuba nubc nuca nucu nuna nunc nunn uabc uaca uaua ubac ubba ucan ucbc ucca ucua unaa unac unan unau unca uncc unna uuuu