-er bbb bbe bbo bbr bbt be- beb bee beo ber bet bev bjj bjr bjt bob boe boj boo bor bot bov brb bre brj bro brr brt brv btb bte bto btr btt btv bvb bve bvo bvr bvt bvv ebb ebe ebj ebo ebr ebt ebv eeb eee eeo eer eet eev ejo ejt eo- eob eoe eoo eor eot erb ere ero err ert erv etb ete etj eto etr ett etv evb eve evo evr evt evv jbj jbo jbr jbt jeb jee jej jeo jer jet jjb jjj jjr job joe joj joo jor jot jrb jro jrr jrt jtb jte jtr jtt jtv jvb jvt ob- obb obe obj obo obr obt obv oeb oee oeo oer oet ojb oje ojo oo- oob ooo oor oot oov or- orb ore oro orr ort orv ot- otb ote oto otr ott otv ov- ovb ove ovo ovv rbb rbe rbo rbr rbt re- reb ree reo rer ret rev rjr rob roe roj roo ror rot rov rrb rrr rrt rtb rte rtj rto rtr rtt rtv rvb rve rvo rvr rvt rvv tbb tbe tbj tbo tbr tbt tbv te- teb tee tej teo ter tet tev tje tjo tjr to- tob toe toj too tor tot tov trb tre tro trr trt trv ttb tte tto ttr ttt ttv tvb tve tvo tvr tvt v-e vbo vbr vbv veb vee veo ver vet vob voe voo vor vot vov vrb vre vrr vrt vtb vte vto vtr vtt vtv vvb vvo vvr vvt vvv

bbbb bbeb bbet bebb bebe bebo beeb beej beer beet beo- beor beot bere bero berr bert bete beto bett betv bevo bobb bobe bobo boee boeo boer boet bojo bojt boob booe boor boot bor- bore borj boro borr bort botb bote boto bott bove bovo breb bree breo brer bret brev brje brob broe broo bror brot brrr btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebro eeee eero eete ejer ejob ejoo ejot eore eoto erbb erbe ereb erer eret erev erob eroe eroo erre erro erve etbr etee eter etoe etre etro ette etto etvo ever evet evje evoe evoo evre j-ro jbob jbtv jebb jebe jeer jeet jere jero jert jetb jete jett jobe jobo joee jojo joor joot jore joro jort joto jott jove jovo jrbr o-eo obbo ober obet oboe obor obot obre obro oere oobe ooer oooo oore oort ootb orbb orbe orbo ore- oreb oreo orer oro- oroe oror orot orro orte orto orve orvr otee oter oto- otoe otoo otor otov otre otro otte otto ovee over ovet ovo- ovoo ovot ovre rbbb rbbr rebb rebe rebo reeb reet reev reot rere rero rert rete reto retr rett reve revo rjtv rob- robb robe robo robt roer roet roev roje rojo roob roor root rore roro rort rote rotj roto rotr rott rove rovo rrrr rtee rtve rver tbrb tebo teej teer teet teev tejo teor ter- tere terj tero terr tete teto tetr tett tobe tobo tobt toee toer toet tojo toor toot tore toro torr tort torv tote toto totr tott tove tovo tre- tree treo tret trev troe troo trot trte trtr ttbb tteo tter ttoe tttt tver tvro tvrr tvtv veer veet veor ver- verb vere vero vert vete veto vetr veve vevo voer voet voor voot vor- vore voro vort vote voto vreo vret vrot vrto vver vvob vvvv

-tree bbbee be-er be-ro beber bebot beebe beete beeve bejte beote berbe beret berob beroe beror berre berte berto betee beter betoo betor betre bett- bette betto bever bevor bo-bo bobet bobov bobr bobre boero bojer booer boore boort borbo boree borer boret borje boro- boroo borot borov borre borro borve borvo botet botev botro botte bovee breer breet brejo breo- brere breto brett breve brobo broer broje broto brrrr btr-t ebber ebbet ebert eeeee eevee eever eorre erbbe erber erere ereve eroor erore eroto error erte erter etete etoro etree etter evere evero everr evert evete evett eveve evoor evote jebet jeroo jerre jerrv jerte jetee jeter jette jetto jever jobbe joe-e jooto joree jotto jover o-r-b obbet obejo obert obete objet oboro obote obreb obrov oerje oo-er ooooo oovoo orbot oreo- orere orero orobe orobo oroer orret orter ortet ortoo orvet otere otero ototo otrov otter ottov over- overo overt ovett rebbe reber rebet reere reeve rejto rere- reree reret rerob retee reter retje retro rette retto rever revet ro-ro robbe robbo rober robo- robor robot robrt robte roero rooer roore roote roove rorer roteb roter roto- rotor rotot rotte rotto rover rtejr rtrev rttov tbtbt teber tebet teret terje teror terre terro tert- terve tervo teter tetov tetr- tetro tette tevet tevot tjore to-be tobbe tober tobet tobor tobot tobre toerr toeto toobe toore torbe toreo toret torje torob torre torro torte torto torve toter toto- totoe totoo totte tover tovet treer treet trejo trere trete trett treve troee trott trove trovo ttttt v-bob v-bor veber vebre veere veeve verbo vereb verje verot verre verte verve vette vetto veveo vever voere voore vorbe vorre vorte voter votre votto vrbje vrbov

b-tree bbbbbb bebeto bebove beebee beeter beever beevor berbee berbeo berber bereet berere berevo berovo berrer berret bertre betere betete bettee better bettor bevoor bjerre bjorbo bobber bobete bobote bobovo bobrov boeber boerre bojort boober booboo bootee booter borbor boreto borore bororo borovo borte botere botero botete botevo botoro botovo botree botter bovert bovver breere brette brever brevet broter brotto ebbert eebree eototo erbree eroto- errett etoeot ettore everte jebbet jeerer jeobet jettee jetter jobber joojoo jorjor jotter oberto obtree obvert oerter oooooo orever ottoor overer overte r-tree reboot rebore rebote rebrov reever rerobe reroot reteer reteet reteoo retere retore retort retree retret retro- retrot retter reverb revere revert revote revver robber robert roboto robovo rooter rootte rorter rotter rovere t-tree teebee teetee teeter teevee terete terreo terrer terret terror terrot terter tertre tetete tetovo tetter tevere tjejer tobeor