-er -ol bbb bbe bbk bbl bbo bbr bbt be- beb bee bek bel beo ber bet bkb bke bkk bkl bko bkr bkt blb ble blk bll blo blr blt bob boe bok bol boo bor bot brb bre brk brl bro brr brt btb bte btk btl bto btr btt ebb ebe ebk ebl ebo ebr ebt eeb eee eek eel eeo eer eet ekb eke ekl eko ekr ekt elb ele elk ell elo elr elt eo- eob eoe eok eol eoo eor eot erb ere erk erl ero err ert etb ete etk etl eto etr ett k-t kbb kbe kbk kbl kbo kbr ke- keb kee kek kel keo ker ket kkb kke kkk kkl kkr kkt kl- klb klo klr klt kob koe kok kol koo kor kot krk krl kro krr krt ktb kte ktk ktl kto ktr ktt lbb lbe lbk lbl lbo lbr lbt leb lee lek lel leo ler let lkb lkl lkr lkt llb lle llk lll llo llr llt lob loe lok lol loo lor lot lrb lrk lro lrr lrt ltb lte ltk ltl lto ltr ltt ob- obb obe obk obl obo obr obt oeb oee oel oeo oer oet okb oke okk okl oko okr olb ole olk oll olo olt oo- oob ook ool ooo oor oot or- orb ore ork orl oro orr ort ot- otb ote otk otl oto otr ott rbb rbe rbk rbl rbo rbr rbt re- reb ree rek rel reo rer ret rkb rke rkk rko rkt rle rll rlo rlr rlt rob roe rok rol roo ror rot rrb rrk rrl rrr rrt rtb rte rtk rtl rto rtr rtt tbb tbe tbk tbl tbo tbr tbt te- teb tee tek tel teo ter tet tkb tke tkk tkl tko tkr tkt tle tlk tll tlo tlr tlt to- tob toe tok tol too tor tot trb tre trk trl tro trr trt ttb tte ttk ttl tto ttr ttt

bbbb bbeb bbet bblb bebb bebe bebo beeb beek beel beer beet beke beko bele belk bell belo belt beo- beok beor beot bere berk bero berr bert bete beto bett blbt bleb blee blek bleo blet blkb blob blok bloo blot bobb bobe bobo boee boel boeo boer boet boke boko bole bolk boll bolo bolt boob booe book bool boor boot bor- bore bork boro borr bort botb bote boto bott breb bree brek brel breo brer bret brkb brob broe brok brol broo bror brot brrr btek btob btor btrt bttb ebbo ebbr ebel eber eboe ebol eboo ebor ebro eeee eeke eele eero eete ekeb ekek eker eket el-b elbe elbo elee elek eleo eler elet elke elko elle ello elok elro elte elto eole eolo eore eorl eoto erbb erbe ereb erel erer eret erke erle erll erob eroe erol eroo erre erro ertl etbr etee etel eter etoe etok etre etro ette etto k-lo kbbb kbbe kbbk kbbl kbbo kbbr kbbt kbeb kbee kbek kbel kbeo kber kbet kbkb kbkk kbkl kbko kbkr kblb kble kbll kblo kblr kblt kbob kboe kbok kboo kbot kbrb kbre kbrk kbrl kbro kbrt kbtb kbte kbtk kbtl kbto kbtr kbtt kebb kebe kebr kebt keek keel keer keet kekb keke kekl keko kele kelk kell kelo kelt keok keol ker- kerb kere kerk kerl kero kerr kert ket- kete ketk keto ketr kett kkbb kkbe kkbl kkbo kkbr kkbt kkkk kklb kkll kklo kkob kkol kkoo kkor kkot kkrb kkre kkrk kkrl kkro kkrr kkrt kktk kktl klbb klbe klbl klbt kleb klee klek kleo kler klet klkk klkl klko klkr kllb klle kllk klob kloe klok klol kloo klor klrk klrr kltk klto kltr kltt kobb kobe kobk kobo kobr koel kokb koke kokk koko kokr kolb kole kolk koll kolo kolr kolt koob kook kool kooo koor koot korb kore kork korl koro korr kort kotb kote kotk koto kotr kott krbb krbe krbk krbl krbr krbt kreb kree krek kreo kret krke krkk krko krkr krle krlt krob kroe krok krol kroo kror krrb krre krrk krrl krro krrr krrt krtk krto krtr ktbb ktbl ktbr ktbt ktee ktek ktel ktkb ktke ktkk ktko ktkr ktkt ktlb ktlk ktlo ktlr ktlt ktob ktoe ktok ktoo ktor ktot ktrb ktre ktrk ktrl ktro ktrr ktrt kttk ktto kttr kttt lblr lbrt lebo leek leel leer leet leke lekk leko lele lell lelo leok leor lere lerk lero lert lete leto lett llet llll lloo lob- lobb lobe lobo loeb loke lokk loko lole loll lolo loob looe look lool loor loot lore lork loro lote lotl loto lotr lott lrrr ltbl ltee ltke lttr o-eo obbo obel ober obet obkb oble oboe obok obol obor obot obre obro oele oere oker oket okko oklo okok okol okor okot okre okro okto olbo ole- oleo oler olet olle ollo olor olot oobe ooer oolo oooo oore oort ootb orbb orbe orbo ore- oreb orek orel oreo orer orke orko orle orlo oro- oroe orok oror orot orro orte orto otee oter oto- otoe otok otoo otor otre otro otte otto rbbb rbbr rble rebb rebe rebk rebo reeb reek reel reet reke reko rekt relb rele rell relo relt reol reot rere rero rert rete reto retr rett rlee rob- robb robe robo robt roel roer roet roke rokk roko rokr role rolk roll rolo rolt roob rook rool roor root rore rork roro rort rote rotk rotl roto rotr rott rrle rrrr rtee rtle rtlt tbrb tebo teek teel teer teet teke tel- tele tell telo telt teok teor ter- tere terk tero terr tete teto tetr tett tkol tobe tobo tobt toee toek toer toet toke toko tol- tole tolk toll tolo tolt took tool toor toot tore tork toro torr tort tote toto totr tott tre- tree trek treo tret troe troo trot trte trtr ttbb tteo tter ttoe tttt

-tree b-r-k bbbee bbook be-er be-ro bebek bebel beber beblo