a-ak a-be aaaa aaab aaae aaba aabb aabt aaea aaka aake aata aatk aatt abaa abab abae abak abat abb- abba abbb abbe abbt abee abet abta aeka aeta aett akaa akae akee akka akte at-t ataa atab atae atak atat atea atee atka atkt atta atte baaa baak baat baba babb babe baek bak- baka bake bakt bata bate batt bbbb bbeb bbet beak beat beba bebb bebe beeb beek beet beka beke beta bete bett btaa btek bttb eaba eata eate ebba eeea eeee eeka eeke eeta eete eka- ekab ekeb ekek eket ekka ekta etak etat etee etka etta ette kaaa kaab kaak kaat kaba kabb kabe kaet kaka kake kakk kakt kat- kata katb kate katk katt kbaa kbab kbae kbak kbat kbba kbbb kbbe kbbk kbbt kbeb kbee kbek kbet kbkb kbkk kbta kbtb kbte kbtk kbtt kea- keak keat keba kebb kebe kebt keek keet keka kekb keke ket- keta kete ketk kett kkaa kkat kkba kkbb kkbe kkbt kkea kkkk kktk ktaa ktae ktak ktat ktba ktbb ktbt ktea ktee ktek ktkb ktke ktkk ktkt kttk kttt taa- taat taba tabb tabe taka take takk takt tata tatb tate tatt tbta teak teat teba teek teet teka teke teta tete tett ttab ttbb tttt