-er bbb bbe bbk bbm bbo bbr bbt be- beb bee bek bem beo ber bet bkb bke bkk bkm bko bkr bkt bmb bme bmk bmm bmo bmr bmt bob boe bok bom boo bor bot brb bre brk brm bro brr brt btb bte btk btm bto btr btt ebb ebe ebk ebm ebo ebr ebt eeb eee eek eem eeo eer eet ekb eke eko ekr ekt em- emb eme emk emm emo emr emt eo- eob eoe eok eom eoo eor eot erb ere erk erm ero err ert etb ete etk etm eto etr ett k-t kbb kbe kbk kbm kbo kbr ke- keb kee kek kem keo ker ket kkb kke kkk kkm kkr kkt kmb kme kmk kmm kmo kmt kob koe kok kom koo kor kot krk kro krr krt ktb kte ktk ktm kto ktr ktt m-o m-r mbb mbe mbk mbm mbo mbr mbt meb mee mek mem meo mer met mkb mke mkk mkm mko mkr mkt mmb mme mmk mmm mmo mmr mmt mob moe mok mom moo mor mot mrb mre mrk mrm mro mrr mrt mtb mte mtk mtm mto mtr mtt ob- obb obe obk obm obo obr obt oeb oee oem oeo oer oet okb oke okk oko okr om- omb ome omm omo omr omt oo- oob ook oom ooo oor oot or- orb ore ork orm oro orr ort ot- otb ote otk otm oto otr ott rbb rbe rbk rbm rbo rbr rbt re- reb ree rek rem reo rer ret rkb rke rkk rkm rko rkt rmb rme rmm rmo rmr rmt rob roe rok rom roo ror rot rrb rrk rrm rrr rrt rtb rte rtk rtm rto rtr rtt tbb tbe tbk tbm tbo tbr tbt te- teb tee tek tem teo ter tet tkb tke tkk tkm tko tkr tkt tmb tme tmk tmm tmo tmr tmt to- tob toe tok tom too tor tot trb tre trk trm tro trr trt ttb tte ttk ttm tto ttr ttt

bbbb bbeb bbet bebb bebe bebo beeb beek beem beer beet beke beko beme beo- beok beor beot bere berk berm bero berr bert bete beto bett bobb bobe bobo boee boeo boer boet boke boko bomb bome bomt boob booe book boom boor boot bor- bore bork borm boro borr bort botb bote boto bott breb bree brek brem breo brer bret brkb brob broe brok brom broo bror brot brrm brrr btek btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebro eeee eeke eemo eero eete ekeb ekek eker eket embe embo embr emek emer emet emme emor emre emte eore eoto erbb erbe ereb erem erer eret erke erme ermo erob eroe eroo erre erro etbr etee etem eter etoe etok etre etrm etro ette etto kbbb kbbe kbbk kbbm kbbo kbbr kbbt kbeb kbee kbek kbeo kber kbet kbkb kbkk kbko kbkr kbmb kbme kbmo kbmr kbmt kbob kboe kbok kboo kbot kbrb kbre kbrk kbro kbrt kbtb kbte kbtk kbtm kbto kbtr kbtt kebb kebe kebr kebt keek keem keer keet kekb keke keko kemb keme kemm kemo kemr keok keom ker- kerb kere kerk kerm kero kerr kert ket- kete ketk keto ketr kett kkbb kkbe kkbo kkbr kkbt kkkk kkmk kkmo kkmr kkmt kkob kkoo kkor kkot kkrb kkre kkrk kkro kkrr kkrt kktk kmbr kmem kmeo kmer kmet kmke kmkk kmko kmkt kmme kmmk kmmm kmmo kmmr kmmt kmob kmoe kmok kmom kmor kmot kmrb kmro kmrr kmtb kmtk kmtr kmtt kobb kobe kobk kobo kobr kokb koke kokk koko kokr komb kome komo komr komt koob kook kooo koor koot korb kore kork koro korr kort kotb kote kotk kotm koto kotr kott krbb krbe krbk krbm krbr krbt kreb kree krek krem kreo kret krke krkk krko krkr krmb krme krmo krmr krmt krob kroe krok krom kroo kror krrb krre krrk krrm krro krrr krrt krtk krtm krto krtr ktbb ktbr ktbt ktee ktek ktem ktkb ktke ktkk ktko ktkr ktkt ktmb ktme ktmk ktmm ktmo ktmr ktmt ktob ktoe ktok ktoo ktor ktot ktrb ktre ktrk ktrm ktro ktrr ktrt kttk ktto kttr kttt mebe mebo meek meem meer meet meke meko meme memo memr meok meor mer- merb mere merk merm mero mert met- mete meto mett mker mkto mmmm mmor mobb mobe mobo moet moke moko mome momo moob mooe mook moor moot morb more mork moro mort motb mote motm moto mott mrbb mrbm mreb mree mrkr mrtm mrtt mtbo mtoe mtom mtor mtre mtrr mttr o-eo obbo ober obet obkb oboe obok obor obot obre obro oeme oere oerm oker oket okko okmo okok okom okor okot okre okro okto ombe ombo omee omeo omer omet omo- omoe omoo omor omre omro oobe ooer oome oooo oore oort ootb orbb orbe orbo ore- oreb orek orem oreo orer orke orko orme ormo oro- oroe orok orom oror orot orro orte orto otee otem oter oto- otoe otok otoo otor otre otro otte otto rbbb rbbr rbmk rebb rebe rebk rebo reeb reek reem reet reke reko rekt reme remo reot rere rero rert rete reto retr rett rob- robb robe robo robt roer roet roke rokk roko rokr romb rome romk romm romo roob rook room roor root rore rork roro rort rote rotk roto rotr rott rrkm rrrr rtee t-mo tbrb tebo teek teem teer teet teke teme temo teok teom teor ter- tere terk term tero terr tete teto tetr tett tmbr tmmk tmro tmtt tobe tobo tobt toee toek toer toet toke toko tomb tome tomm tomo tomt took toom toor toot tore tork torm toro torr tort tote totm toto totr tott tre- tree trek trem treo tret trmb trmk troe trom troo trot trte trtr ttbb tteo tter ttoe tttt

-tree b-r-k bbbee bbook be-er be-ro bebek beber bebot beebe beeke beete beker bekke bekko bekok bembe bembo bemer bemet beote berbe berek beret berk-