a-ak a-be aaaa aaab aaae aaar aaba aabb aabt aaea aaka aake aara aare aart aata aatk aatt abaa abab abae abak abar abat abb- abba abbb abbe abbr abbt abee aber abet abra abta aeer aeka aer- aera aeta aetr aett akaa akae akar akee aker akka akr- akra akre akte arab arae arak arar arat arba arbe area aree arek aret arka arke arr- arra arre arrk arrr arrt arta arte artr at-t ataa atab atae atak atar atat atea atee ater atka atkt atra atre atrk atta atte attr baaa baak baar baat baba babb babe babr baek baer bak- baka bake bakr bakt bar- bara barb bare bark barr bart bata bate batt bbbb bbeb bbet beak bear beat beba bebb bebe beeb beek beer beet beka beke bera bere berk berr bert beta bete bett brab brae brak brat brea breb bree brek brer bret brka brkb brrr btaa btek btrt bttb eaba eara earb eare eart eata eate ebba ebbr eber eeea eeee eeka eeke eera eeta eete eka- ekab ekeb ekek eker eket ekka ekta erat erba erbb erbe ereb erer eret erke erra erre erta etak etat etbr etee eter etka etra etre etta ette kaaa kaab kaak kaar kaat kaba kabb kabe kabr kaer kaet kaka kake kakk kakt kara karb kare kark karr kart kat- kata katb kate katk katr katt kbaa kbab kbae kbak kbar kbat kbba kbbb kbbe kbbk kbbr kbbt kbeb kbee kbek kber kbet kbkb kbkk kbkr kbra kbrb kbre kbrk kbrt kbta kbtb kbte kbtk kbtr kbtt kea- keak kear keat keba kebb kebe kebr kebt keek keer keet keka kekb keke ker- kera kerb kere kerk kerr kert ket- keta kete ketk ketr kett kkaa kkar kkat kkba kkbb kkbe kkbr kkbt kkea kkkk kkrb kkre kkrk kkrr kkrt kktk krab krae krak krar krat krba krbb krbe krbk krbr krbt krea kreb kree krek kret krka krke krkk krkr krrb krre krrk krrr krrt krta krtk krtr ktaa ktae ktak ktar ktat ktba ktbb ktbr ktbt ktea ktee ktek ktkb ktke ktkk ktkr ktkt ktrb ktre ktrk ktrr ktrt kttk kttr kttt raab raak raat raba rabb rabe rabk raer raka rake rakk rakt rara rarb rare rark rata rate ratk ratt rbbb rbbr rea- reae reak rear reat reba rebb rebe rebk reeb reek reet reka reke rekt rera rere rert reta rete retr rett rrat rrrr rtee taa- taar taat taba tabb tabe taer taka take takk takt tara tarb tare tark tarr tart tata tatb tate tatr tatt tbar tbrb tbta teak tear teat teba teek teer teet teka teke ter- tera tere terk terr teta tete tetr tett traa trab trae trak trat tre- trea tree trek tret trra trte trtr ttab ttbb tter tttt