a-ak a-be aaaa aaab aaae aaba aabb aaea aage aaka aake abaa abab abae abag abak abb- abba abbb abbe abee aega aeka agag agba agea agee agga agge akaa akae akee akeg akka baaa baak baba babb babe baek baga bage bagg bak- baka bake bbbb bbeb bbga beag beak beba bebb bebe beeb beeg beek bega begg beka beke eaba eaga eage ebba eeea eeee eega eeka eeke egaa egae egba egbe egea egee eggb egge eka- ekab ekeb ekek ekka gaba gabb gabe gaea gaga gage gagg gbag geab geba gebe geek gege gegg gggg kaaa kaab kaag kaak kaba kabb kabe kabg kag- kaga kagb kage kagg kaka kake kakk kbaa kbab kbae kbak kbba kbbb kbbe kbbg kbbk kbeb kbee kbek kbga kbgb kbge kbgg kbkb kbkg kbkk kea- keag keak keba kebb kebe keek kega kege kegg kegk keka kekb keke kgab kgak kgba kgbb kgeb kgga kggg kkaa kkag kkba kkbb kkbe kkbg kkea kkeg kkgb kkkk