-er bbb bbe bbo bbr bbt be- beb bee beo ber bet bev bob boe boo bor bot bov brb bre bro brr brt brv btb bte bto btr btt btv bvb bve bvo bvr bvt bvv ebb ebe ebo ebr ebt ebv eeb eee eeo eer eet eev eo- eob eoe eoo eor eot erb ere ero err ert erv etb ete eto etr ett etv evb eve evo evr evt evv ob- obb obe obo obr obt obv oeb oee oeo oer oet 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 rob roe roo ror rot rov rrb rrr rrt rtb rte rto rtr rtt rtv rvb rve rvo rvr rvt rvv tbb tbe tbo tbr tbt tbv te- teb tee teo ter tet tev to- tob toe 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 beer beet beo- beor beot bere bero berr bert bete beto bett betv bevo bobb bobe bobo boee boeo boer boet boob booe boor boot bor- bore boro borr bort botb bote boto bott bove bovo breb bree breo brer bret brev brob broe broo bror brot brrr btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebro eeee eero eete 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 evoe evoo evre 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 rob- robb robe robo robt roer roet roev roob roor root rore roro rort rote roto rotr rott rove rovo rrrr rtee rtve rver tbrb tebo teer teet teev teor ter- tere tero terr tete teto tetr tett tobe tobo tobt toee toer toet 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 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 booer boore boort borbo boree borer boret boro- boroo borot borov borre borro borve borvo botet botev botro botte bovee breer breet breo- brere breto brett breve brobo broer 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 o-r-b obbet obert obete oboro obote obreb obrov 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 rere- reree reret rerob retee reter 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 rtrev rttov tbtbt teber tebet teret teror terre terro tert- terve tervo teter tetov tetr- tetro tette tevet tevot to-be tobbe tober tobet tobor tobot tobre toerr toeto toobe toore torbe toreo toret torob torre torro torte torto torve toter toto- totoe totoo totte tover tovet treer treet trere trete trett treve troee trott trove trovo ttttt v-bob v-bor veber vebre veere veeve verbo vereb verot verre verte verve vette vetto veveo vever voere voore vorbe vorre vorte voter votre votto 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 bobber bobete bobote bobovo bobrov boeber boerre 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 oberto obtree 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 tobeor toboot toetoe tooter tootoo torero tororo torovo torret tortor torver totebo totoro totrot totter tovero tovore trebor treete tretee trette trevet trevor trotro trotte trover vebret veerer veerto verbo- verbot veroor verree verrer verret vertre verver vervet vervo vetere vetoer vetovo vetrov vetter vorort vrbovo vvvvvv

bbbbbbb beetree berbere berrett bertero bertree bo-tree bobotee boe-bot boo-boo borbore boretto borovoe borrero bottero bottovo e-voter eeeroer erovete errevet everett evertor o-breve oberrot obterre orebro oroboro ottetto ottrott overbet overrev ovrette re-bore rebrovo reteere reterre retrete rettert rettore reveree reverer revette roberto robobee rootrot roovere rotebro terere tereto- terreer terrere terrove tettete to-bote toe-toe too-too toovere torbert torrert totorve tototoo treetee trettre treveer treveor tro-tro trottee trotter veeboer veotere verbere verrett verrore verveer veterov vetrovo vettoor vorbote vrbove

bbbbbbbb bebetter beetroot berebere betterer betteror betterto bo-bo-bo boortree boottree boretree brebotte breveter etbetter everette oevreboe ortovero overboot overbore