a-ak a-do a-ok aaaa aaab aaad aaam aaba aabb aabd aabm aada aaka aama aamb aamd aamo aaoo abaa abab abad abak abam abb- abba abbb abbo abda abdo abma abmb aboa abob abod abok aboo adaa adab adad adak adam adao adba adda addd addo adma admb adob adod adok adoo akaa akam akao akka akko akok akom amaa amad amam amb- amba ambo amda amdo amka amm- amma ammo amob amod amok amoo aoba aoma baaa baad baak baam baba babb babm babo bada badb badd bado bak- baka bako bama bamb bamm bbad bbbb bbdd bbdo bmaa bmdb boab boad boak boba bobb bobo boda bodb bodo boka boko boma bomb boob bood book boom d-bo daab daad daam daba dabb dabo dada dado daka dako dama damb damm damo dddd dkba dmaa dmab dmba doab doak doba dobb dod- doda dodd dodo doka doko doma domb domm domo doob dood dook doom kaaa kaab kaak kaam kaba kabb kabd kabo kad- kada kadd kadm kado kaka kakk kakm kako kam- kama kamb kamm kamo kaoa kaok kbaa kbab kbad kbak kbam kbba kbbb kbbd kbbk kbbm kbbo kbdb kbdo kbkb kbkk kbko kbmb kbmo kboa kbob kbod kbok kboo kdaa kdab kdad kdak kdam kdao kdbb kdbm kddb kddd kddk kdka kdkb kdkd kdkk kdko kdma kdmd kdmo kdok kdom kkaa kkam kkba kkbb kkbd kkbo kkda kkdd kkdm kkdo kkkk kkma kkmk kkmo kkoa kkob kkoo kmad kmak kmam kmbd kmdb kmdo kmkk kmko kmmk kmmm kmmo kmoa kmob kmod kmok kmom koab koak koba kobb kobk kobo koda kodk kodm kodo koka kokb kokk koko koma komb komo koob kook kooo maaa maad maak maam maba mabo mada madb madd mado maka mako mama mamo mbam mbba mbda mbdb mddm mdma mdmk mkad mkak mmaa mmab mmda mmdb mmmd mmmm mmod moaa moab moam moba mobb mobo moda modd modo moka moko moma momo mooa moob mood mook oadm oama obad obak obba obbo obkb obok odam odbo odda oddd odma odom odoo okak okam okka okko okmo okok okom omak omam omao ombo omda omdb omma omo- omoa omoo ooaa ooak ooba ooda ooma oooo