-er b-p bbb bbe bbo bbp bbr bbt be- beb bee beo bep ber bet bev bob boe boo bop bor bot bov bpb bpe bpo bpp bpr bpt bpv brb bre bro brp brr brt brv btb bte bto btp btr btt btv bvb bve bvo bvp bvr bvt bvv ebb ebe ebo ebp ebr ebt ebv eeb eee eeo eep eer eet eev eo- eob eoe eoo eop eor eot ep- epb epe epo epp epr ept erb ere ero erp err ert erv etb ete eto etp etr ett etv evb eve evo evp evr evt evv ob- obb obe obo obp obr obt obv oeb oee oeo oep oer oet oo- oob ooo oop oor oot oov op- opb ope opo opp opr opt opv or- orb ore oro orp orr ort orv ot- otb ote oto otp otr ott otv ov- ovb ove ovo ovp ovv p-p pbb pbe pbo pbp pbr pbt peb pee peo pep per pet pev pob poe poo pop por pot pov ppb ppe ppo ppp ppr ppt ppv prb pre pro prp prr prt prv pt- ptb pte pto ptp ptr ptt ptv pvb pve pvo pvp pvr pvt pvv rbb rbe rbo rbp rbr rbt re- reb ree reo rep rer ret rev rob roe roo rop ror rot rov rpb rpe rpo rpp rpr rpt rpv rrb rrp rrr rrt rtb rte rto rtp rtr rtt rtv rvb rve rvo rvp rvr rvt rvv tbb tbe tbo tbp tbr tbt tbv te- teb tee teo tep ter tet tev to- tob toe too top tor tot tov tpb tpe tpo tpp tpr tpt tpv trb tre tro trp trr trt trv ttb tte tto ttp ttr ttt ttv tvb tve tvo tvp tvr tvt v-e vbo vbr vbv veb vee veo vep ver vet vob voe voo vop vor vot vov vpb vpe vpo vpp vpr vpt vrb vre vrp vrr vrt vtb vte vto vtr vtt vtv vvb vvo vvr vvt vvv

bbbb bbeb bbet bbpr bebb bebe bebo beeb beep beer beet beo- beor beot bepo bere bero berr bert bete beto bett betv bevo bobb bobe bobo boee boeo boep boer boet boob booe boop boor boot bope bopp bor- bore boro borr bort botb bote boto bott bove bovo bpoe bpot breb bree breo brep brer bret brev brob broe broo bror brot brrr btbp btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebpo ebro eeee eero eete eore eoto epee eper epor epot eppo eppp eprb epro eprp epte eptv erbb erbe ereb erer eret erev erob eroe eroo erpe erre erro erve etbr etee eter etoe etre etro ette etto etvo ever evet evoe evoo evop evre o-eo obbo ober obet oboe obor obot obre obro oere oevp oobe ooer oooo oore oort ootb ootp opep oper opet opo- opor oppo opto orbb orbe orbo ore- oreb oreo orer oro- oroe oror orot orpe orro orte orto orve orvr otee otep oter oto- otoe otoo otor otov otpp otre otro otte otto ovee over ovet ovo- ovoo ovot ovpp ovre peep peer peet peev peor pepe pepo per- pere pero perp perr pert perv pete peto petr pett pobo poer poet poop poor poot pop- pope popo popp popt porb pore poro porr port pote poto pott povo ppbv pper pppo pppp pptt pptv pre- preb pree prep pret prev pro- prob proe proo prop prot prov prtp prtr pter ptop rbbb rbbr rebb rebe rebo reeb reep reet reev reop reot repe repo repp repr rept rere rero rert rete reto retr rett reve revo revp rob- robb robe robo robt roer roet roev roob roop roor root rope ropo rore roro rort rote roto rotr rott rove rovo rpet rpob rpoe rrrr rtee rttp rtve rver tbrb tbtp tebo teer teet teev teor tepe tepp ter- tere tero terp terr tete teto tetr tett tobe tobo tobt toee toer toet toor toot top- tope topo topp topt topv tore toro torp torr tort torv tote toto totr tott tove tovo tper tppp tppr tpte tptp tptr tre- tree treo tret trev troe troo trop trot trpe trpp trpv trte trtr ttbb tteo tter ttoe ttop tttt tver tvro tvrr tvtv veep veer veet veor vepe vepr ver- verb vere vero vert vete veto vetr veve vevo voer voet voor voot vopt vor- vore voro vort vote voto votp vpro vreo vret vrot vrto vtpr vver vvob vvpb vvvv

-tree bbbee be-er be-ro beber bebop bebot beebe beete beeve beote bepop beppe beppo 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 bopet 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 e-pro ebber ebbet ebert eeeee eepee eevee eever eorre epopt epote epptb erbbe erber erept 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 oeppo oo-er ooooo oovoo opepe opere opobo opovo opper opter opto- optot optto orbot oreo- orere orero orobe orobo oroer orret orter ortet ortoo orvet otere otero ototo otpor otrov otter ottov over- overo overt ovett p-rep pebre peebo peere peert peete peeve pepee peppe pept- pepto perer peret perot perov perre perro perte perto perve pervo petbe peter petr- petre petro pette petto po-po pobe poete pooer poope poopo poore poort poote poove poper popet popop popov poppe poppo poreb porer poret poro- porro porte porto poteb potee poter potoo potop potor potpe potro potte potto pover povet povvo preop prete preto pretv preve probe probo proer proor proot prop- prope propp propr propt prore prot- proto prove provo prtor pter- ptere ptero ptprb ptpre ptpro ptprr ptprt pveto rebbe reber rebet rebop