-er -th bbb bbe bbh bbk bbo bbr bbt be- beb bee beh bek beo ber bet bhb bhe bhh bhk bho bhr bht bkb bke bkk bko bkr bkt bob boe boh bok boo bor bot brb bre brh brk bro brr brt btb bte bth btk bto btr btt ebb ebe ebh ebk ebo ebr ebt eeb eee eek eeo eer eet ehb ehe ehh eho ehr eht ekb eke ekh eko ekr ekt eo- eob eoe eoh eok eoo eor eot erb ere erh erk ero err ert etb ete eth etk eto etr ett hbb hbe hbh hbk hbo hbr hbt he- heb hee heh hek heo her het hhb hhe hhh hhk hho hhr hht hkb hkh hkk hko hkr hkt hob hoe hoh hok hoo hor hot hr- hrb hre hrh hrk hro hrr hrt htb hte hth htk hto htr htt k-t kbb kbe kbh kbk kbo kbr ke- keb kee keh kek keo ker ket khe khh khk kho khr kkb kke kkh kkk kkr kkt kob koe koh kok koo kor kot krk kro krr krt ktb kte kth ktk kto ktr ktt ob- obb obe obh obk obo obr obt oeb oee oeh oeo oer oet ohe ohh oho ohr oht okb oke okk oko okr oo- oob ooh ook ooo oor oot or- orb ore orh ork oro orr ort ot- otb ote oth otk oto otr ott rbb rbe rbh rbk rbo rbr rbt re- reb ree reh rek reo rer ret rh- rhb rhe rhh rho rhr rht rkb rke rkk rko rkt rob roe roh rok roo ror rot rrb rrh rrk rrr rrt rtb rte rtk rto rtr rtt tbb tbe tbh tbk tbo tbr tbt te- teb tee teh tek teo ter tet th- thb the thh thk tho thr tht tkb tke tkk tko tkr tkt to- tob toe toh tok too tor tot trb tre trh trk tro trr trt ttb tte tth ttk tto ttr ttt

bbbb bbeb bbet bebb bebe bebo beeb beek beer beet behr beke beko beo- beok beor beot bere berk bero berr bert bete beth beto bett bher bhet bhor bhot bhrt bobb bobe bobo boee boeo boer boet boho bohr boht boke boko boob booe booh book boor boot bor- bore borh bork boro borr bort botb bote both boto bott breb bree brek breo brer bret brkb brob broe broh brok broo bror brot brrr btek btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebro eeee eeke eero eete eeth eheh eher ehre ehte ekeb ekek eker eket ekho eore eoto erbb erbe ereb erer eret erke erob eroe eroo erre erro erth etbr etee eter eth- ethe etho etoe etoh etok etre etro ette etto hebb hebe hebo hebr heeb heek heer heet hehe heho heke hekt heor herb here herk hero herr hert hete heth heto hett hhhh hket hobe hobo hoek hoer hohe hoho hoke hoko hooe hook hoor hoot hore hork horo horr hort hotb hote hoth hoto hotr hott hree hrob hrtb hrte htet htoh htrk httr kbbb kbbe kbbk kbbo kbbr kbbt kbeb kbee kbeh kbek kbeo kber kbet kbhb kbhe kbhh kbhr kbht kbkb kbkk kbko kbkr kbob kboe kbok kboo kbot kbrb kbre kbrh kbrk kbro kbrt kbtb kbte kbtk kbto kbtr kbtt kebb kebe kebr kebt keeh keek keer keet kehk kehr kekb keke keko keok ker- kerb kere kerk kero kerr kert ket- kete keth ketk keto ketr kett khbr khbt kheb kher khet khhk khho khke khkk khkr khob khoe khok khor khot khrk khro khrr khrt khtb khte khth khtk khto khtr khtt kkbb kkbe kkbo kkbr kkbt kkhb kkhh kkhk kkhr kkkk kkob kkoh kkoo kkor kkot kkrb kkre kkrh kkrk kkro kkrr kkrt kktk kobb kobe kobk kobo kobr kohh koho kohr koht kokb koke kokh kokk koko kokr koob kook kooo koor koot korb kore kork koro korr kort kotb kote koth kotk koto kotr kott krbb krbe krbk krbr krbt kreb kree kreh krek kreo kret krke krkh krkk krko krkr krob kroe kroh krok kroo kror krrb krre krrk krro krrr krrt krth krtk krto krtr ktbb ktbr ktbt ktee kteh ktek kthe kthh kthk ktho kthr ktht ktkb ktke ktkk ktko ktkr ktkt ktob ktoe ktoh ktok ktoo ktor ktot ktrb ktre ktrh ktrk ktro ktrr ktrt ktth kttk ktto kttr kttt o-eo obbo ober obet obkb oboe obok obor obot obre obrh obro oere ohbe ohee oher ohho ohob ohoh ohok ohre ohte ohto okeh oker oket okko okok okor okot okre okro okto oobe ooer ooho oooh oooo oore oort ootb orbb orbe orbo ore- oreb oreh orek oreo orer orhe orke orko oro- oroe orok oror orot orro orte orth orto otee oter othe otho othr oto- otoe otoh otok otoo otor otre otro otte otto rbbb rbbr rboh rebb rebe rebk rebo reeb reek reet rehb rehe reht reke reko rekt reot rere rero rert rete reth reto retr rett rheb rhee rheo rhet rhob rhoh rob- robb robe robo robt roer roet rohe rohr roke rokh rokk roko rokr roob rook roor root rore rork roro rort rote roth rotk roto rotr rott rrrr rtee rthk tbrb tebo teek teer teet teho tehr teke tekh teoh teok teor ter- tere terk tero terr tete teth teto tetr tett the- theb thee thek theo ther thet thoe thoo thor thot thre thro thtb thtr tobe tobo tobt toee toeh toek toer toet toho toke toko tooh took toor toot tore tork toro torr tort tote toth 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 beber bebot beebe beeke beete beeth beher behet behot beker bekke bekko bekok beote beoth berbe bereh berek beret berhe berk- berke berko berob beroe berok beror berre berte berth berto betee beter bethe betke betoo betor betre bett-