-er -up b-p b-u bbb bbe bbo bbp bbr bbt bbu be- beb bee beo bep ber bet beu bob boe boo bop bor bot bou bpb bpe bpo bpp bpr bpt bpu brb bre bro brp brr brt bru btb bte bto btp btr btt btu bub bue buo bup bur but buu ebb ebe ebo ebp ebr ebt ebu eeb eee eeo eep eer eet eo- eob eoe eoo eop eor eot eou ep- epb epe epo epp epr ept epu erb ere ero erp err ert eru etb ete eto etp etr ett etu eu- eub eue eup eur eut ob- obb obe obo obp obr obt obu oeb oee oeo oep oer oet oo- oob ooo oop oor oot op- opb ope opo opp opr opt or- orb ore oro orp orr ort oru ot- otb ote oto otp otr ott otu ou- oue ouo oup our out p-p pbb pbe pbo pbp pbr pbt pbu peb pee peo pep per pet peu pob poe poo pop por pot pou ppb ppe ppo ppp ppr ppt ppu prb pre pro prp prr prt pru pt- ptb pte pto ptp ptr ptt ptu pub pue pup pur put puu rbb rbe rbo rbp rbr rbt rbu re- reb ree reo rep rer ret reu rob roe roo rop ror rot rou rpb rpe rpo rpp rpr rpt rpu rrb rrp rrr rrt rru rtb rte rto rtp rtr rtt rtu rub rue ruo rup rur rut ruu tbb tbe tbo tbp tbr tbt tbu te- teb tee teo tep ter tet teu to- tob toe too top tor tot tou tpb tpe tpo tpp tpr tpt tpu trb tre tro trp trr trt tru ttb tte tto ttp ttr ttt ttu tub tue tuo tup tur tut tuu ubb ube ubo ubp ubr ubt ubu ueb uee uep uer uet uob uoe uoo uop uor uot up- upb upe upo upp upr upt upu ur- urb ure uro urp urr urt uru utb ute uto utp utr utt utu uue uur uut uuu

bbbb bbeb bbet bbpr bebb bebe bebo beeb beep beer beet beo- beor beot bepo bere bero berr bert beru bete beto bett betu beur bobb bobe bobo bobu boee boeo boep boer boet boob booe boop boor boot bope bopp bor- bore boro borr bort boru botb bote boto bott boue boup bour bout bpoe bpot breb bree breo brep brer bret brob broe broo bror brot brou brrr brue brup brut btbp btob btor btrt bttb bubb bube bubo bubu buer bueu bur- burb bure buro burp burr burt buru but- bute buto butt ebbo ebbr eber eboe eboo ebor ebpo ebro ebru ebur eeee eero eete eetu eore eoto epee eper epor epot eppo eppp eprb epro eprp epte epub erbb erbe ereb erer eret erob eroe eroo erpe erre erro ertu erub erur etbr etee eter etoe etre etro ette etto ettu euer eur- eure euro eurt o-eo obbo ober obet oboe obor obot obre obro oere oobe ooer oooo oore oort ootb ootp opep oper opet opo- opor oppo opto orbb orbe orbo orbu ore- oreb oreo orer oro- oroe oror orot orpe orro orte orto orub orup otee otep oter oto- otoe otoo otor otpp otre otro otte otto ottu otur ouer oupe our- oure ouro ourt out- outb oute outo ouu- peep peer peet peor peou pepe pepo per- pere pero perp perr pert peru pete peto petr pett peur peut pobo poer poet poop poor poot pop- pope popo popp popt porb pore poro porr port pote poto pott potu poup pour pout pper pppo pppp ppru pptt ppur pre- preb pree prep pret preu pro- prob proe proo prop prot prou prtp prtr prue prut pruu pter ptop pu-e pube pubu pueo puer puet pueu pupe pupu pur- purb pure puro purp purr puru put- pute puto putt putu rbbb rbbr rebb rebe rebo rebu reeb reep reet reop reot reou repe repo repp repr rept repu rere rero rert reru rete reto retr rett reue reup reut reuu rob- robb robe robo robt robu roer roet roob roop roor root rope ropo rore roro rort roru rote roto rotr rott roub roue roup rout rpet rpob rpoe rrrr rtee rttp rubb rube rubp rubu ruer ruet rupe rupp rupt rure ruro rurp ruru rute ruto rutt rutu tbrb tbtp tebo tebu teer teet teor tepe tepp tepu ter- tere tero terp terr teru tete teto tetr tett tetu teut tobe tobo tobt tobu toee toer toet toor toot top- tope topo topp topt topu tore toro torp torr tort toru tote toto totr tott toup tour tout tper tppp tppr tpte tptp tptr tput tre- tree treo tret treu troe troo trop trot trou trpe trpp trte trtr trub true trut truu ttbb tteo tter ttoe ttop tttt tubb tube tubo tubr tubu tuer tuet tuor tupe tupo tupu turb ture turo turp turr turt turu tute tuto tutt tutu tuuo u-rp ubbe ubbo uber ubet uor- uore upbe upor uppe uppp uppu upto upup urbe ure- uret uro- uroo urpo urre urte urup urur urut utep uter utor utto uttu uuuu

-tree bbbee be-er be-ro beber bebop bebot beebe beete beeut beote beour bepop beppe beppo beppu berbe beret berob beroe beror berre berru berte berto betee beter betoo betor betou betre bett- bette betto beuer beure beute bo-bo bobet bobr bobre bobup boero boeur booer boore boort booru bopet borbo boree borer boret boro- boroo borot borou borre borro borup borut botet botou botro botte bottu bouee bouer bouet boure boute bouto brebu breer breet breo- brere breto brett breu- brobo broer broto broue brout brrrr bruer bruet brute btr-t bubbe buber buret buroo burro burru burte burtt burut buteo buter buto- butor butot butou butte butuo butut e-pro ebber ebbet ebert eboue ebure eeeee eepee eorre epopt epote epptb epure erbbe erber erept erere eroor erore eroto error errtu erte erter