a-ak a-be aaaa aaab aaae aaba aabb aaea aaka aake abaa abab abae abak abb- abba abbb abbe abee abez abza aeka akaa akae akee akka aza- azab azaz azza baaa baak baaz baba babb babe baek baez bak- baka bake baza baze bbbb bbeb beak beba bebb bebe beeb beek beka beke beze bzzz eaba ebba eeea eeee eeka eeke eeze eka- ekab ekeb ekek ekka ezek kaaa kaab kaak kaba kabb kabe kabz kaka kake kakk kaza kaze kazz kbaa kbab kbae kbak kbaz kbba kbbb kbbe kbbk kbbz kbeb kbee kbek kbez kbkb kbkk kbkz kbze kbzz kea- keak keaz keba kebb kebe keek keka kekb keke keza kezb keze kezz kkaa kkba kkbb kkbe kkbz kkea kkez kkkk kkzz kzaz kzbb kzbe kzbk kzbz kzee kzke kzkz kzza kzzb kzzk kzzz zaba zaka zakk zaza zbek zeae zeba zebe zeek zeke zeze zzzz