a-ak a-do a-ok aaaa aaab aaad aaba aabb aabd aada aaka aaoo abaa abab abad abag abak abb- abba abbb abbo abda abdo abgd aboa abob abod abok aboo adaa adab adad adag adak adao adba adda addd addo adob adod adog adok adoo ag-o agad agag agao agba agbo agda agga agob agod agog agoo akaa akao akka akko akok aoba baaa baad baak baba babb babo bada badb badd bado baga bagg bago bak- baka bako bbad bbbb bbdd bbdo bbga bdog bkgd boab boad boag boak boba bobb bobo boda bodb bodo boga bogd bogg bogo boka boko boob bood boog book d-bo daab daad daag daba dabb dabo dada dado daga dagg dago daka dako dbag dddd dgka dgkb dgkd dgkg dkba doab doak doba dobb dod- doda dodd dodg dodo dog- doga dogg dogo doka doko doob dood dook gaba gabb gabo gada gadd gadk gado gaga gagg gago gbag gbbo gddb gggg goad goba gobo goda godo goga gogo good goog gook kaaa kaab kaag kaak kaba kabb kabd kabg kabo kad- kada kadd kado kag- kaga kagb kagg kago kaka kakk kako kaoa kaog kaok kbaa kbab kbad kbak kbba kbbb kbbd kbbg kbbk kbbo kbdb kbdg kbdo kbga kbgb kbgg kbgo kbkb kbkg kbkk kbko kboa kbob kbod kbok kboo kdaa kdab kdad kdag kdak kdao kdbb kdbg kddb kddd kddg kddk kdgo kdka kdkb kdkd kdkk kdko kdog kdok kgab kgak kgba kgbb kgdb kgdd kgga kggg kggo kkaa kkag kkba kkbb kkbd kkbg kkbo kkda kkdd kkdg kkdo kkgb kkgo kkkk kkoa kkob kkoo koab koak koba kobb kobk kobo koda kodk kodo koga kogb kogd kogg kogo koka kokb kokk koko koob koog kook kooo obad obak obba obbo obkb obok odbo odda oddd odoo ogb ogba ogoa ogod ogog okak okgo okka okko okok ooaa ooak ooba ooda oooo