-er bbb bbe bbk bbr bbt be- beb bee bek ber bet bkb bke bkk bkr bkt brb bre brk brr brt btb bte btk btr btt ebb ebe ebk ebr ebt eeb eee eek eer eet ekb eke ekr ekt erb ere erk err ert etb ete etk etr ett k-t kbb kbe kbk kbr ke- keb kee kek ker ket kkb kke kkk kkr kkt krk krr krt ktb kte ktk ktr ktt rbb rbe rbk rbr rbt re- reb ree rek rer ret rkb rke rkk rkt rrb rrk rrr rrt rtb rte rtk rtr rtt tbb tbe tbk tbr tbt te- teb tee tek ter tet tkb tke tkk tkr tkt trb tre trk trr trt ttb tte ttk ttr ttt

bbbb bbeb bbet bebb bebe beeb beek beer beet beke bere berk berr bert bete bett breb bree brek brer bret brkb brrr btek btrt bttb ebbr eber eeee eeke eete ekeb ekek eker eket erbb erbe ereb erer eret erke erre etbr etee eter etre ette kbbb kbbe kbbk kbbr kbbt kbeb kbee kbek kber kbet kbkb kbkk kbkr kbrb kbre kbrk kbrt kbtb kbte kbtk kbtr kbtt kebb kebe kebr kebt keek keer keet kekb keke ker- kerb kere kerk kerr kert ket- kete ketk ketr kett kkbb kkbe kkbr kkbt kkkk kkrb kkre kkrk kkrr kkrt kktk krbb krbe krbk krbr krbt kreb kree krek kret krke krkk krkr krrb krre krrk krrr krrt krtk krtr ktbb ktbr ktbt ktee ktek ktkb ktke ktkk ktkr ktkt ktrb ktre ktrk ktrr ktrt kttk kttr kttt rbbb rbbr rebb rebe rebk reeb reek reet reke rekt rere rert rete retr rett rrrr rtee tbrb teek teer teet teke ter- tere terk terr tete tetr tett tre- tree trek tret trte trtr ttbb tter tttt

-tree b-r-k bbbee be-er bebek beber beebe beeke beete beker bekke berbe berek beret berk- berke berre berte betee beter betke betre bett- bette breek breer breet breke brere brett brrrr btr-t ebber ebbet ebert eeeee ekker erbbe erber erere erte erter eteke etete etree etrek etter k-t-b kebbe kebek keber keere kerek keret kerre ketek keter kette kreek kreke krete rebbe reber rebet reere rekke rere- reree reret retee reter rette rt-rk tbtbt teber tebet teket tekke terek teret terre tert- teter tetr- tette treer treet trere trete trett ttttt

b-tree bbbbbb beebee beeker beeter bekker berbee berber bereet bereke berere berker berrer berret bertre betere betete bettee better breere brekke brette ebbert eebree erbree errett k-tree kebber keeker kerber kerker kertee ketter kreker kretek r-tree reeker reteer reteet retere retree retret retter t-tree teebee teetee teeter terete terrer terret terter tertre tetete tetter trebek treete treker tretee trette

bbbbbbb beetree berbere berrett bertree bk-tree bkerke brekker eerbeek ekekete kee-kee kektebe kreeker reteere reterre retrete rettert terere terreer terrere tettete treetee trekker trettre

bbbbbbbb bebetter berebere betterer etbetter kerkebet ketterer teketeke

beebeebee etterbeek keek-keek tebe-tebe

betterbeer

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