bbbb bbeb bbet bebb bebe bebi beeb beek beer beet beik beir beit beke beki bere beri berk berr bert bete beti bett bibb bibe bibi bieb bier biet bike birb bire biri birk birr birt bite bitt breb bree brei brek brer bret brie brik brit brkb brrr btek btie btrt bttb ebbr eber ebit eeee eeke eete eiei eier eike eiki eire eitb eiti eitr ekeb ekek eker eket ekki erbb erbe ereb erei erer eret erie erik erit erke erki erre etbr etee eter etik etre ette etti i-be ibet ibie ibri ibtb ieet ieie iere ieri iett iiie iiii iiit iitr iitt ikee iker ikki ikri irbe iree irer iri- irie irki irre irri irte irti itbe itek iter itet itie itri kbbb kbbe kbbi kbbk kbbr kbbt kbeb kbee kbek kber kbet kbib kbie kbik kbit kbkb kbkk kbkr kbrb kbre kbri kbrk kbrt kbtb kbte kbtk kbtr kbtt kebb kebe kebi kebr kebt keek keer keet keib keii keik keir kekb keke keki ker- kerb kere keri kerk kerr kert ket- kete keti ketk ketr kett kibb kibe kibi kibr kibt kier kiii kiik kiit kiki kikk kikr kikt kirb kiri kirk kirr kirt kite kiti kitr kitt kkbb kkbe kkbi kkbr kkbt kkik kkit kkkk kkrb kkre kkrk kkrr kkrt kktk krbb krbe krbi krbk krbr krbt kreb kree krei krek kret krib krik krit krke krki krkk krkr krrb krre krri krrk krrr krrt krti krtk krtr ktbb ktbr ktbt ktee ktek ktib ktie ktik ktkb ktke ktkk ktkr ktkt ktrb ktre ktri ktrk ktrr ktrt ktti kttk kttr kttt rbbb rbbr rebb rebe rebk reeb reek reet reii reik reir reit reke reki rekt rere reri rert rete reti retr rett rib- ribe riek rier riet rike riki rikk rire riri rite riti ritt rrrr rtee rtei tbit tbrb teek teer teet teie teir teke ter- tere teri terk terr tete teti tetr tett tibi tie- tiee tiei tier tiet tiit tike tiki tirb tire tiri tirr tite titi titt tre- tree trei trek tret tri- trib trie trik trit trte trtr ttbb tter tttt