-er bbb bbe bbo bbr bbs bbt be- beb bee beo ber bes bet bev bob boe boo bor bos bot bov brb bre bro brr brs brt brv bsb bse bso bsr bss bst bsv btb bte bto btr bts btt btv bvb bve bvo bvr bvs bvt bvv ebb ebe ebo ebr ebs ebt ebv eeb eee eeo eer ees eet eev eo- eob eoe eoo eor eos eot erb ere ero err ers ert erv es- esb ese eso esr ess est esv etb ete eto etr ets ett etv evb eve evo evr evs evt evv ob- obb obe obo obr obs obt obv oeb oee oeo oer oes oet oo- oob ooo oor oos oot oov or- orb ore oro orr ors ort orv os- osb ose oso osr oss ost osv ot- otb ote oto otr ots ott otv ov- ovb ove ovo ovs ovv rbb rbe rbo rbr rbs rbt re- reb ree reo rer res ret rev rob roe roo ror ros rot rov rrb rrr rrs rrt rsb rse rso rsr rss rst rsv rtb rte rto rtr rts rtt rtv rvb rve rvo rvr rvs rvt rvv sbb sbe sbo sbr sbs sbt sbv se- seb see seo ser ses set sev sob soe soo sor sos sot sov sr- srb sre sro srr srs srt srv ss- ssb sse sso ssr sss sst ssv stb ste sto str sts stt stv svb sve svo svr svs svt svv tbb tbe tbo tbr tbs tbt tbv te- teb tee teo ter tes tet tev to- tob toe too tor tos tot tov trb tre tro trr trs trt trv tsb tse tso tsr tss tst tsv ttb tte tto ttr tts ttt ttv tvb tve tvo tvr tvs tvt v-e vbo vbr vbs vbv veb vee veo ver ves vet vob voe voo vor vos vot vov vrb vre vrr vrs vrt vsb vse vso vsr vss vst vsv vtb vte vto vtr vts vtt vtv vvb vvo vvr vvs vvt vvv

-ose bbbb bbbs bbeb bbet bebb bebe bebo beeb beer bees beet beo- beor beos beot bere bero berr bers bert bes- bese beso bess best bete beto bets bett betv bevo bevs bobb bobe bobo bobs boee boeo boer boes boet boob booe boor boos boot bor- bore boro borr bors bort bose boso boss bost botb bote boto bots bott bove bovo breb bree breo brer bres bret brev brob broe broo bror bros brot brrr brrs brsb brsr brst bseb bsee bser bses bset bsos bsse bsts bstv btob btor btrt btss bttb ebbo ebbr ebbs eber ebes eboe eboo ebor ebos ebro eeee eees eero eers eese eete eets eoes eore eost eoto eots erbb erbe ereb erer eres eret erev erob eroe eroo eros erre erro errs erse erso erst erts erve esbo esbs esee eseo eser eses eset eso- esos esse esso esst este esto estr ests estv etbr etee eter etes etoe etos etre etro ette etto etvo ever eves evet evoe evoo evos evre evrs evst o-eo obbo ober obes obet oboe obor obos obot obre obro obsr obss obst obts obvs oere oers oese oest oobe ooer ooes oooo ooos oore oort oose oost ootb oots orbb orbe orbo orbs ore- oreb oreo orer ores oro- oroe oror oros orot orro orrs orse orso orte orto orts orve orvr orvs osbe osee oser oses oset osoo osor osos osov osro ossb osse osso oste ostr osts osve otbs otee oter otes oto- otoe otoo otor otos otov otre otro otrs otse otso otte otto otts ovee over ovet ovo- ovoo ovot ovre rbbb rbbr rbbs rbss rbst rebb rebe rebo rebs reeb rees reet reev reos reot rere rero rers rert rese reso ress rest rete reto retr rets rett reve revo revs rob- robb robe robo robs robt roer roes roet roev roob roor roos root rore roro rort rose roso ross rost rote roto rotr rots rott rove rovo rovs rrrr rsee rsos rsre rsts rtee rtes rtss rtts rtve rver s-os s-vt sbbs sber sbor sbot sbse sbst se-e se-o se-s se-t sebe sebo sebs sebt seeb seer sees seet serb sere sero serr sers sert serv sese seso sess sest set- sete seto sets sett seve sobe sobo sobr sobs sobt soeo soes soor soos soot sorb sore soro sorr sors sort sose soso soss sost sosv sote soto sots sove sovo sovs sreb sreo sres sros srtr srtv ssbr ssee sses sset ssot ssrs sssb ssss sstb ssts st-v stbs stee steo ster stes stet stev stob stoe stoo stor stos stot stre stro strs stss sttr stvs svet svor svtr tbbs tbrb tbst tebo teer tees teet teev teor teos ter- tere tero terr ters tese teso tess test tete teto tetr tets tett tobe tobo tobs tobt toee toer toes toet toor toos toot tore toro torr tors tort torv tosb tose toso toss tost tote toto totr tots tott tove tovo tre- tree treo tres tret trev troe troo tros trot trst trte trtr trvs tses tset tsob tsos tsse tssr tsst tsts ttbb tteo tter ttoe ttss tttt tvbs tver tves tvos tvro tvrr tvss tvtv veer vees veet veor ver- verb vere vero vers vert vese vess vest vete veto vetr vets veve vevo voer voes voet voor voot vor- vore voro vors vort vose voso voss vote voto vreo vret vrot vrse vrto vsee vses vsoe vsse vsto vtes vtrs vver vvob vvsb vvvv

-tree bbbee bbser be-er be-ro beber bebes bebot beebe beebs beers beest beete beets beeve beost beote berbe beres beret berob beroe beror berre berse berte berto berts besee beset besob besos besot besov besse besso beste bests betee beter betes betoo betor betre betrs betso bett- bette betto betts bever beves bevor bo-bo bobet bobos bobov bobr bobre bobst bobts boero boers boese boets boobs booer boore boors boort boose boost boots borbo