-er b-u bbb bbe bbo bbr bbt bbu bbx be- beb bee beo ber bet beu bex bob boe boo bor bot bou box brb bre bro brr brt bru brx btb bte bto btr btt btu btx bub bue buo bur but buu bux bxb bxo bxx ebb ebe ebo ebr ebt ebu ebx eeb eee eeo eer eet eex eo- eob eoe eoo eor eot eou erb ere ero err ert eru etb ete eto etr ett etu etx eu- eub eue eur eut eux ex- exe exo exr ext exu exx ob- obb obe obo obr obt obu obx oeb oee oeo oer oet oex oo- oob ooo oor oot oox or- orb ore oro orr ort oru orx ot- otb ote oto otr ott otu ou- oue ouo our out ox- oxb oxo oxt oxx rbb rbe rbo rbr rbt rbu rbx re- reb ree reo rer ret reu rex rob roe roo ror rot rou rox rrb rrr rrt rru rtb rte rto rtr rtt rtu rtx rub rue ruo rur rut ruu rux rxr t-x tbb tbe tbo tbr tbt tbu te- teb tee teo ter tet teu tex to- tob toe too tor tot tou tox trb tre tro trr trt tru trx ttb tte tto ttr ttt ttu ttx tub tue tuo tur tut tuu tux txe txt txu ubb ube ubo ubr ubt ubu ubx ueb uee uer uet uob uoe uoo uor uot uox ur- urb ure uro urr urt uru urx utb ute uto utr utt utu utx uue uur uut uuu uxb uxo uxr uxt uxu xbe xbr xbx xee xer xet xeu xex xoo xor xot xox xrt xrx xtr xtx xue xxo xxx

bbbb bbeb bbet bbox bebb bebe bebo beeb beer beet beo- beor beot bere bero berr bert beru bete beto bett betu beur beux bobb bobe bobo bobu boee boeo boer boet boob booe boor boot boox bor- bore boro borr bort boru botb bote boto bott boue bour bout breb bree breo brer bret brex brob broe broo bror brot brou brox brrr brue brut brux btex btob btor btrt bttb bubb bube bubo bubu buer bueu bur- burb bure buro burr burt buru but- bute buto butt ebbo ebbr eber eboe eboo ebor ebox ebro ebru ebur eeee eero eete eetu eext eore eoto eoux er-x erbb erbe ereb erer eret erob eroe eroo erre erro ertu erub erur etbr etee eter etoe etox etre etro ette etto ettu etux euer eur- eure euro eurt exer exo- exor exrx exte extr o-eo obbo ober obet obex oboe obor obot obox obre obro oere oobe ooer oooo oore oort ootb orbb orbe orbo orbu ore- oreb oreo orer orex oro- oroe oror orot orro orte orto orub otee oter oto- otoe otoo otor otre otro otte otto ottu otur ouer our- oure ouro ourt out- outb oute outo ouu- oxer oxo- oxox oxxo rbbb rbbr rebb rebe rebo rebu reeb reet reot reou rere rero rert reru rete reto retr rett reue reut reuu reux rexx rob- robb robe robo robt robu roer roet roob roor root roox rore roro rort roru rote roto rotr rott roub roue rout roux roxo rrrr rtee rtex rubb rube rubu ruer ruet rure ruro ruru rute ruto rutt rutu tbox tbrb tebo tebu teer teet teor ter- tere tero terr teru tete teto tetr tett tetu tetx teut text tobe tobo tobt tobu toee toer toet toor toot tore toro torr tort toru torx tote toto totr tott tour tout tox- toxo toxt tre- tree treo tret treu trex troe troo trot trou trox trte trtr trub true trut truu trux ttbb tteo tter ttoe tttt tubb tube tubo tubr tubu tuer tuet tuor turb ture turo turr turt turu tute tuto tutt tutu tuuo txtr ubbe ubbo uber ubet uext uor- uore urbe ure- uret urex uro- uroo urox urre urte urur urut uter utor utto uttu uuuu uxor uxue xbee xbox xeer xer- xero xert xexe xoro xote xout xoxo xtro xuxu xxxo xxxx

-tree bbbee be-er be-ro beber bebot bebox beebe beete beeut beote beour 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 boero boeur booer boore boort booru bootx borbo boree borer boret borex boro- boroo borot borou borox borre borro borut botet botou botox botro botte bottu bouee bouer bouet bouex boure boute bouto boutx boxbe boxee boxer bre-x brebu breer breet breo- brere breto brett bretx breu- breux brobo broer broto broue brout brrrr bruer bruet brute btr-t bubbe buber buoux buret buroo burro burru burte burtt burut buteo buter buto- butor butot butou butte butuo butut e-box ebber ebbet ebert eboue ebure eeeee eorre erbbe erber erere eroor erore eroto error errtu erte erter etete etext etoro etour etree etter eturu eubro eurex euro- eurre exert exorb exore exort exout exter extre extro extue exurb exute o-r-b obbet obert obete oboro obote oboue obout obreb oo-er ooooo orbot oreo- orere orero orexo orobe orobo oroer orout oroux orret orter ortet ortoo orube oruro orutu otere otero ototo otour otter ottur oture oubut ouert ouoro oure- outer outre outro outto oxter rebbe reber rebet rebox rebut reere reorx rere- reree reret rerob retee reter retex retox retro rette retto reuer reuet reute rexer ro-ro robbe robbo rober robo- robor robot robrt robte robur roero roeux rooer roore roote rooue rorbu rorer roteb roter roto- rotor rotot rotox rotte rotto roubt rouer rouet roure route routt rtext rubee ruber rubor ruere ruete ruter rutte ruutu t-box t-rex tbtbt tbutt teber tebet teret tereu terex teror terre terro tert- teruo teter tetex tetr- tetro tette teuto texor texte to-be tobbe tober tobet tobor tobot tobou tobre toerr toeto toobe toore torbe toreo toret torob torre torro torte torto tortu torue torxe toter totex toto- totoe totoo totte toure touro toute toxo- treer treet trere