-er bbb bbe bbg bbo bbr bbt be- beb bee beg beo ber bet bgb bge bgg bgo bgr bgt bjg bjj bjr bjt bob boe bog boj boo bor bot brb bre brg brj bro brr brt btb bte btg bto btr btt ebb ebe ebg ebj ebo ebr ebt eeb eee eeg eeo eer eet egb ege egg ego egr egt ejo ejt eo- eob eoe eog eoo eor eot erb ere erg ero err ert etb ete etg etj eto etr ett gbe gbg gbj gbo gbr gbt ge- geb gee geg geo ger get ggb ggg ggj ggo ggr ggt gje gjg gjr gjt gob goe gog goo gor got grb gre grg grj gro grr grt gtb gte gtg gto gtr gtt jbg jbj jbo jbr jbt jeb jee jeg jej jeo jer jet jgb jge jgo jgr jgt jjb jjg jjj jjr job joe jog joj joo jor jot jrb jrg jro jrr jrt jtb jte jtg jtr jtt ob- obb obe obg obj obo obr obt oeb oee oeg oeo oer oet oge ogg ogo ogt ojb oje ojo oo- oob oog ooo oor oot or- orb ore org oro orr ort ot- otb ote otg oto otr ott rbb rbe rbg rbo rbr rbt re- reb ree reg reo rer ret rgb rge rgg rgo rgr rgt rjg rjr rob roe rog roj roo ror rot rrb rrg rrr rrt rtb rte rtg rtj rto rtr rtt tbb tbe tbg tbj tbo tbr tbt te- teb tee teg tej teo ter tet tgb tge tgg tgo tgr tgt tje tjo tjr to- tob toe tog toj too tor tot trb tre trg tro trr trt ttb tte ttg tto ttr ttt

bbbb bbeb bbet bbrg bebb bebe bebo beeb beeg beej beer beet begg bego beo- beor beot bere berg bero berr bert bete beto bett bobb bobe bobo boee boeo boer boet boge bogg bogo bogt bojo bojt boob booe boog boor boot bor- bore borg borj boro borr bort botb bote boto bott breb bree breg breo brer bret brje brob broe brog broo bror brot brrr btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebro eeee eerg eero eete egbe egee eger eggb egge eggo ego- egor egot egre egte ejer ejob ejoo ejot eore eoto erbb erbe ereb erer eret erg- ergg ergo erob eroe eroo erre erro etbr etee eter etoe etre etro ette etto g-jo gbbo gebe geer geet gege gegg gego geo- geog gerb gere gero gert getb gete getg geto gett ggbt gggg gobe gobo goer gogo goje gojg gojo goog goor goot gorb gore gorg goro gorr gort gote gotj goto gott grbr greb gree greg gret grob grog groo gror grot grrr gtbr gtoe j-ro jbob jebb jebe jeer jeet jego jere jero jert jetb jete jetg jett jobe jobo joee jogg jojo joor joot jore jorg joro jort joto jott jrbr jrge jtbg o-eo obbo ober obet oboe obor obot obre obro oegb oere ogb ogbe ogee oger ogge ogog ogre ogro oobe ooer oooo oore oort ootb orbb orbe orbo ore- oreb oreg oreo orer orge orgo oro- oroe oror orot orro orte orto otee oter oto- otoe otog otoo otor otre otro otte otto rbbb rbbr rebb rebe rebo reeb reet rege rego regr regt reog reot rere rerg rero rert rete reto retr rett rgbe rgtr rob- robb robe robo robt roeg roer roet roge rogg rogo roje rojo roob roog roor root rore roro rort rote rotg rotj roto rotr rott rrrr rtee tbrb tebo teej teer teet tegg tego tegt tejo teor ter- tere terj tero terr tete teto tetr tett tobe tobo tobt toee toer toet toge togo togr togt tojg tojo toor toot tore torg toro torr tort tote toto totr tott tre- tree treg treo tret trge troe trog troo trot trte trtr ttbb tteo tter ttoe tttt

-tree bbbee be-er be-ro beber bebog bebot beebe beete begee beget begge begob begor begot begto bejte beote berbe bereg beret berge berob beroe beror berre berte berto betee beter betoo betor betre bett- bette betto bjorg bo-bo bobet bobr bobre boege boero boger boget bogge bogoe bogor bogot bojer booer boore boort borbo boree borer boret borge borgo borje boro- boroo borot borre borro botet botro botte breer breet breg- brege bregg brejo breo- brere breto brett brobo broer broje broto brrrr btr-t ebber ebbet eberg ebert eeeee egger egret ejogo eorre erbbe erber erege erere ergo- ergot eroge eroor erore eroto error erte erter etete etoro etree etrog etter gberg geber gebet gebre geebo geere geert geete gegge geoje georg gerbe gerbo gerre gertt getee geter getgo gette getto go-go go-oo go-to gobbe gobbo gobeo gobet gobot goget gogro gojoe goobo googe goore goote gorbe goree gorer gorge gorgo gorre goter gotoo gotor gotto grebe grebo greer greet grege gregg grego greot grete grett groet groge grogg groot grote grott grrrr gtrot jebet jegbo jeroo jerre jerte jetee jeter jette jetto jobbe joe-e jogee joget jogge jogre jooto joree jorge jotto o-r-b obbet obejo oberg obert obete objet oboro obote obreb oerje ogogo oo-er ooooo orbot oreo- orere orero orobe orobo oroer orret orrgo orter ortet ortoo otego otere otero ototo otter rebbe rebeg reber rebet reege reere reger reget regge reggo regtt rejog rejto reorg rere- reree reret rerob retee reter retgo retje retrg retro rette retto ro-ro robbe robbo rober robo- robor robot robrt robte roero roger roget rogge rooer rooge roore roote rorer roteb roter rotge roto- rotor rotot rotte rotto rtejr tbtbt teber tebet teege tegre teret terge tergo terje teror terre terro tert- teter tetr- tetro tette tjore to-be to-go tobbe tobeg tober tobet tobog tobor tobot tobre toego toerr toeto toget togge toobe toore torbe toreo toret torgo torje torob torog torre torro torte torto toter toto- totoe totoo totte treer treet treg- trego trejo trere trete trett troee trott ttttt

b-tree bbbbbb bebeto beebee