-er bbb bbc bbe bbr bbt bcb bcc bce bcr bct be- beb bec bee ber bet brb bre brr brt btb btc bte btr btt c-- cbb cbc cbe cbr cbt ccb ccc cce ccr cct ce- ceb cec cee cer cet crb crc cre crr crt ctb ctc cte ctr ctt ebb ebc ebe ebr ebt ec- ecb ecc ece ecr ect eeb eec eee eer eet erb erc ere err ert etb etc ete etr ett rbb rbc rbe rbr rbt rcb rcc rce rcr rct re- reb rec ree rer ret rrb rrc rrr rrt rtb rtc rte rtr rtt tbb tbc tbe tbr tbt tcb tcc tce tcr tct te- teb tec tee ter tet trb trc tre trr trt ttb ttc tte ttr ttt

bbbb bbeb bbet bbrc bcbc bccc bcec bcer bcet bctc bebb bebe beeb beer beet berc bere berr bert betc bete bett brcb brce breb brec bree brer bret brrr brtc btcc btec btrc btrt bttb cbbc cbcc cbce cbcr cbct cbec cbee cber cbet cbre cbrt cbtc ccbc cccb cccc ccee ccrc ccre ccrt cctb cctc cctt cec- cece cect ceeb ceec cer- cerc cere cert cet- cete crbc crcc crce crcr cre- creb crec cree cret crrt crtc ctec ctrc ebbc ebbr ebcc eber ecbc ecbe eccb eccc ecce ecct ecrc ecrr ect- ectc eeee eerc eetc eete erbb erbe ercc erce ereb erec erer eret errc erre etbc etbr etcc etec etee eter etre ette rbbb rbbr rcbc rccb rccc rcet rctc rebb rebe recc rece recr rect reeb reet rere rert rete retr rett rrrr rtcc rtce rtee tbcb tbcc tbce tbrb tccc tctc tecr tect teec teer teet ter- terc tere terr tete tetr tett trcc tre- trec tree tret trtc trte trtr ttbb tter tttt

-tree bbbee be-er beber beebe beete berbe berec beret berre berte betee beter betre bett- bette brece breer breet brere brett brrrr btc-e btr-t c-tec ccccc ccett cebec ceber ceere cerc- cerce cerec cerer ceret cerre certe cette crebe crece creer crete ctree cttee ebber ebbet ebert eeeee erbbe erber erect erere erte erter etete etree etter rebbe rebec reber rebet recce recet rect- recte reece reere rere- reree reret retee reter rette tbtbt teber tebet tectb terce teret terre tert- teter tetr- tette treer treet trere trete trett ttttt

b-tree bbbbbb beebee beeter berbee berber bereet berere berrer berret bertre betere betete bettee better breere brette ceecee cerete creete ebbert eebree eerect erbree errett etcetc r-tree rebbec retece reteer reteet retere retree retret retter t-tree teebee teetee teeter tercer tercet terete terrer terret terter tertre tetete tetter tr-rec treece treete tretee trette

bbbbbbb beetree berbere berrett bertree cerbere cerebr- cert-ee erecter reerect reteere reterre retrete rettert tec-tec terere terreer terrere tettete treetee trettre

bbbbbbbb bebetter berebere betterer etbetter recetter

beebeebee tebe-tebe

betterbeer cerre-tree

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