-er b-p bbb bbe bbk bbo bbp bbr bbt be- beb bee bek beo bep ber bet bkb bke bkk bko bkp bkr bkt bob boe bok boo bop bor bot bpb bpe bpo bpp bpr bpt brb bre brk bro brp brr brt btb bte btk bto btp btr btt ebb ebe ebk ebo ebp ebr ebt eeb eee eek eeo eep eer eet ekb eke eko ekp ekr ekt eo- eob eoe eok eoo eop eor eot ep- epb epe epo epp epr ept erb ere erk ero erp err ert etb ete etk eto etp etr ett k-t kbb kbe kbk kbo kbp kbr ke- keb kee kek keo kep ker ket kkb kke kkk kkp kkr kkt kob koe kok koo kop kor kot kpe kpk kpo kpp kpr kpt krk kro krp krr krt ktb kte ktk kto ktp ktr ktt ob- obb obe obk obo obp obr obt oeb oee oeo oep oer oet okb oke okk oko okp okr oo- oob ook ooo oop oor oot op- opb ope opk opo opp opr opt or- orb ore ork oro orp orr ort ot- otb ote otk oto otp otr ott p-p pbb pbe pbk pbo pbp pbr pbt peb pee pek peo pep per pet pkb pke pko pkp pkr pkt pob poe pok poo pop por pot ppb ppe ppk ppo ppp ppr ppt prb pre prk pro prp prr prt pt- ptb pte ptk pto ptp ptr ptt rbb rbe rbk rbo rbp rbr rbt re- reb ree rek reo rep rer ret rkb rke rkk rko rkp rkt rob roe rok roo rop ror rot rpb rpe rpk rpo rpp rpr rpt rrb rrk rrp rrr rrt rtb rte rtk rto rtp rtr rtt tbb tbe tbk tbo tbp tbr tbt te- teb tee tek teo tep ter tet tkb tke tkk tko tkp tkr tkt to- tob toe tok too top tor tot tpb tpe tpk tpo tpp tpr tpt trb tre trk tro trp trr trt ttb tte ttk tto ttp ttr ttt

bbbb bbeb bbet bbpr bebb bebe bebo beeb beek beep beer beet beke beko beo- beok beor beot bepo bere berk bero berr bert bete beto bett bkpr bkpt bobb bobe bobo boee boeo boep boer boet boke boko boob booe book boop boor boot bope bopp bor- bore bork boro borr bort botb bote boto bott bpoe bpot breb bree brek breo brep brer bret brkb brob broe brok broo bror brot brrr btbp btek btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebpo ebro eeee eeke eero eete ekeb ekek eker eket ekpe ekpo eore eoto epee eper epor epot eppo eppp eprb epro eprp epte erbb erbe ereb erer eret erke erob eroe eroo erpe erre erro etbr etee eter etoe etok etre etro ette etto kbbb kbbe kbbk kbbo kbbr kbbt kbeb kbee kbek kbeo kber kbet kbkb kbkk kbko kbkr kbob kboe kbok kboo kbot kbpe kbpk kbpo kbpr kbpt kbrb kbre kbrk kbro kbrt kbtb kbte kbtk kbto kbtr kbtt kebb kebe kebr kebt keek keep keer keet kekb keke keko keok kep- kepe kept ker- kerb kere kerk kero kerp kerr kert ket- kete ketk keto ketp ketr kett kkbb kkbe kkbo kkbr kkbt kkkk kkob kkoo kkor kkot kkpk kkpt kkrb kkre kkrk kkro kkrr kkrt kktk kobb kobe kobk kobo kobr kokb koke kokk koko kokp kokr koob kook kooo koop koor koot kopb kope kopp kopr kopt korb kore kork koro korr kort kotb kote kotk koto kotr kott kpbb kpbe kpbr kpek kper kpet kpke kpkk kpkr kpob kpoe kpok kpoo kpop kppk kppo kppp kppr kprb kpre kprk kpro kprp kprr kprt kpte kpto kptr kptt krbb krbe krbk krbr krbt kreb kree krek kreo kret krke krkk krko krkr krob kroe krok kroo krop kror krpr krpt krrb krre krrk krro krrr krrt krtk krto krtr ktbb ktbr ktbt ktee ktek ktep ktkb ktke ktkk ktko ktkr ktkt ktob ktoe ktok ktoo ktop ktor ktot ktpk ktpo ktpr ktpt ktrb ktre ktrk ktro ktrp ktrr ktrt kttk ktto kttp kttr kttt o-eo obbo ober obet obkb oboe obok obor obot obre obro oere oker oket okko okok okor okot okpe okpo okre okro okto oobe ooer oooo oore oort ootb ootp opep oper opet opo- opor oppo opto orbb orbe orbo ore- oreb orek oreo orer orke orko oro- oroe orok oror orot orpe orro orte orto otee otep oter oto- otoe otok otoo otor otpp otre otro otte otto pbpk peek peep peer peet peke pekk peko peor pepe pepo per- pere perk pero perp perr pert pete peto petr pett pobo poer poet poke poko pook poop poor poot pop- pope popo popp popt porb pore pork poro porr port pote poto pott pper pppo pppp pptt pre- preb pree prek prep pret pro- prob proe proo prop prot prtp prtr pter ptop pttk rbbb rbbr rebb rebe rebk rebo reeb reek reep reet reke reko rekt reop reot repe repo repp repr rept rere rero rert rete reto retr rett rob- robb robe robo robt roer roet roke rokk roko rokr roob rook roop roor root rope ropo rore rork roro rort rote rotk roto rotr rott rpet rpob rpoe rrrr rtee rttp tbrb tbtp tebo teek teer teet teke teok teor tepe tepp ter- tere terk tero terp terr tete teto tetr tett tobe tobo tobt toee toek toer toet toke toko took toor toot top- tope topo topp topt tore tork toro torp torr tort tote toto totr tott tper tpke tppp tppr tpte tptp tptr tre- tree trek treo tret troe troo trop trot trpe trpp trte trtr ttbb tteo tter ttoe ttop tttt

-tree b-r-k bbbee bbook be-er be-ro bebek beber bebop bebot beebe beeke beete beker bekke bekko bekok beote bepop beppe beppo berbe berek beret berk- berke berko berob beroe berok beror berre berte berto betee beter betke betoo betor betre