-er bbb bbe bbm bbr bbt be- beb bee bem ber bet bmb bme bmm bmr bmt brb bre brm brr brt btb bte btm btr btt ebb ebe ebm ebr ebt eeb eee eem eer eet em- emb eme emm emr emt erb ere erm err ert etb ete etm etr ett m-r mbb mbe mbm mbr mbt meb mee mem mer met mmb mme mmm mmr mmt mrb mre mrm mrr mrt mtb mte mtm mtr mtt rbb rbe rbm rbr rbt re- reb ree rem rer ret rmb rme rmm rmr rmt rrb rrm rrr rrt rtb rte rtm rtr rtt tbb tbe tbm tbr tbt te- teb tee tem ter tet tmb tme tmm tmr tmt trb tre trm trr trt ttb tte ttm ttr ttt

bbbb bbeb bbet bebb bebe beeb beem beer beet beme bere berm berr bert bete bett breb bree brem brer bret brrm brrr btrt bttb ebbr eber eeee eete embe embr emer emet emme emre emte erbb erbe ereb erem erer eret erme erre etbr etee etem eter etre etrm ette mebe meem meer meet meme memr mer- merb mere merm mert met- mete mett mmmm mrbb mrbm mreb mree mrtm mrtt mtre mtrr mttr rbbb rbbr rebb rebe reeb reem reet reme rere rert rete retr rett rrrr rtee tbrb teem teer teet teme ter- tere term terr tete tetr tett tmbr tmtt tre- tree trem tret trmb trte trtr ttbb tter tttt

-tree bbbee be-er beber beebe beete bembe bemer bemet berbe beret berme berre berte betee beter betre bett- bette breem breer breet breme bremm brere brett brmmm brrrr btr-t ebber ebbet ebert eeeee embee ember emeer emere emert emmer emmet emtee erbbe erber erem- erere erte erter etete etree etter mbebe mbere mbret mebbe meere meete membe memer merer meret merre merte meter metr- metre mette mmmmm mrmet mt-te mt-tm mt-tr mt-tt mtree rebbe reber rebet reeme reere remee remer remet rere- reree reret retee retem reter rette tbtbt teber tebet teeme tembe terem teret terme terre tert- teter tetr- tette treer treet treme trere trete trett ttttt

b-tree bbbbbb beebee beebem beembe beemer beerme beeter bemeet bemete berbee berber bereet berere bermet berrer berret bertem bertre beteem betere betete bettee better breere bremer brette ebbert eebree embree emeere emeter emmert emmett erbree errett m-tree mbembe meeter meetme meetre member membre mememe memere merete mermer mermet merrem merret merter meteer metrer metter mettet r-tree remeet remete reteer reteet retere reterm retree retret retter t-tree teebee teemer teerme teetee teeter tembre temere terete termer terrer terret terter tertre tetete tetter treete tremet tretee trette

bbbbbbb beetree berbere berrett bertree betemme brember bremete bremmer e-meter eemmeer emebert memmert mereret merrett mertert metreme metrete r-meter rembert remeber reteere reterre retrete rettert terere terreer terrere tettete treetee trettre

bbbbbbbb bebetter berebere betterer bremette embetter erembert etbetter meremere remember remembre

beebeebee emmermeer tebe-tebe

betterbeer mememememe mettembert rememberer rememberme

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