a-ak a-ok aaaa aaab aaba aabb aaka aaoo abaa abab abag abak abb- abba abbb abbo aboa abob abok aboo ag-o agag agao agba agbo agga agob agog agoo akaa akao akka akko akok aoba baaa baak baba babb babo baga bagg bago bak- baka bako bbbb bbga boab boag boak boba bobb bobo boga bogg bogo boka boko boob boog book gaba gabb gabo gaga gagg gago gbag gbbo gggg goba gobo goga gogo goog gook kaaa kaab kaag kaak kaba kabb kabg kabo kag- kaga kagb kagg kago kaka kakk kako kaoa kaog kaok kbaa kbab kbak kbba kbbb kbbg kbbk kbbo kbga kbgb kbgg kbgo kbkb kbkg kbkk kbko kboa kbob kbok kboo kgab kgak kgba kgbb kgga kggg kggo kkaa kkag kkba kkbb kkbg kkbo kkgb kkgo kkkk kkoa kkob kkoo koab koak koba kobb kobk kobo koga kogb kogg kogo koka kokb kokk koko koob koog kook kooo obak obba obbo obkb obok ogb ogba ogoa ogog okak okgo okka okko okok ooaa ooak ooba oooo