-er bbb bbe bbi bbo bbr bbt bbx be- beb bee bei beo ber bet bex bi- bib bie bii bio bir bit bix bob boe boi boo bor bot box brb bre bri bro brr brt brx btb bte bti bto btr btt btx bxb bxi bxo bxx ebb ebe ebi ebo ebr ebt ebx eeb eee eeo eer eet eex eib eie eii eio eir eit eix eo- eob eoe eoi eoo eor eot erb ere eri ero err ert etb ete eti eto etr ett etx ex- exe exi exo exr ext exx ibb ibe ibi ibo ibr ibt ibx ie- iee iei ier iet iex iib iie iii iio iir iit iix io- iob ioe ioi ioo ior iot ir- irb ire iri iro irr irt irx itb ite iti ito itt itx ixe ixi o-i ob- obb obe obi obo obr obt obx oeb oee oei oeo oer oet oex oib oie oii oio oir oit oo- oob ooi ooo oor oot oox or- orb ore ori oro orr ort orx ot- otb ote oti oto otr ott ox- oxb oxi oxo oxt oxx rbb rbe rbi rbo rbr rbt rbx re- reb ree rei reo rer ret rex rib rie rii rio rir rit rix rob roe roi roo ror rot rox rrb rri rrr rrt rtb rte rti rto rtr rtt rtx rxr t-x tbb tbe tbi tbo tbr tbt te- teb tee tei teo ter tet tex tib tie tii tio tir tit tix to- tob toe toi too tor tot tox trb tre tri tro trr trt trx ttb tte tti tto ttr ttt ttx txe txi txt xbe xbr xbx xee xer xet xex xie xii xio xit xix xoi xoo xor xot xox xrt xrx xti xtr xtx xxi xxo xxx

bbbb bbeb bbet bbox bebb bebe bebi bebo beeb beer beet beir beit beo- beor beot bere beri bero berr bert bete beti beto bett bibb bibe bibi bibo bieb bier biet bio- bioi biot biox birb bire biri biro birr birt birx bite bito bitt bitx bixi bobb bobe bobi bobo boee boeo boer boet boi- boie boii boit boob booe boor boot boox bor- bore bori boro borr bort botb bote boti boto bott breb bree brei breo brer bret brex brie brio brit brix brob broe broo bror brot brox brrr btex btie btob btor btrt bttb ebbo ebbr eber ebit ebix eboe eboo ebor ebox ebro eeee eero eete eext eiei eier eire eitb eiti eito eitr eoir eore eori eoto er-x erbb erbe ereb erei erer eret erie erio erit erob eroe eroi eroo erre erro etbr etee eter etio etix etoe etox etre etro ette etti etto exer exit exo- exor exrx exte extr i-be ibet ibex ibie ibot ibox ibri ibro ibtb ieet ieie ieio iere ieri iett iiie iiii iiio iiit iioi iioo iitr iitt iobi ioee ioii ioio ioit iooi iooo iore iori iote ioto irbe iree irer irex iri- irie irio irix irob irre irri irte irti itbe iter itet itex itie itoi itoo itor itri itto ixxi o-eo obbo ober obet obex obie obit obix oboe oboi obor obot obox obre obri obro oere oeti oier oiii oire oirt oiti oobe oobi ooer oooo oore oort ootb orbb orbe orbi orbo ore- oreb oreo orer orex ori- orie orio orit orix oro- oroe oror orot orri orro orte orto otee oter otit oto- otoe otoo otor otre otro otte otti otto oxer oxi- oxie oxo- oxox oxxo rbbb rbbr rebb rebe rebo reeb reet reii reir reit reot rere reri rero rert rete reti reto retr rett rexx rib- ribe ribo rier riet riex riot rire riri rite riti rito ritt rixe rixo rob- robb robe robi robo robt roer roet roio roir roit roob rooi roor root roox rore rori roro rort rote roti roto rotr rott roxo rrrr rtee rtei rtex tbit tbox tbrb tebo teer teet teie teir teor ter- tere teri tero terr tete teti teto tetr tett tetx text tibi tie- tiee tiei tieo tier tiet tiit tirb tire tiri tiro tirr tite titi tito titt tixt tobe tobi tobo tobt toee toei toer toet toie toit toor toot tore tori toro torr tort torx tote toti toto totr tott tox- toxi toxo toxt tre- tree trei treo tret trex tri- trib trie trio trit trix troe troi troo trot trox trte trtr ttbb tteo tter ttoe tttt txii txtr xbee xbox xeer xer- xero xert xexe xibe xibo xiii xito xixi xoro xote xoxo xtie xtro xxii xxix xxxi xxxo xxxx

-tree bbbee be-er be-ro beber bebot bebox bebti beebe beeri beete beibi beier beire beite beoir beote berbe berei beret berie berio berit berob beroe beror berre berri berte berti berto betee beter betie betio betoo betor betre bett- bette betti betto betxi bibbe bibbo biber bibie bibio bibri biebe biere bieri biert bieti biore birie biter bitit bitte bitti bitto bixie bixio bo-bo bobbi bobet bobr bobre bobri boero boibe boier boire boiro boite boito booer booit boore boort bootx borbo boree borer boret borex borio boro- boroo borot borox borre borro botet botie botox botro botte botti boxbe boxee boxer bre-x breer breet breit breo- brere breto brett bretx bribe brier briot brite brito britt brixx brobo broer broto brrrr btr-t e-box ebber ebbet ebbie ebert ebibe ebrio eeeee eerie eetti eieio eirie eiter eitri eorre erbbe erber erere erier erio- erite erixx eroor erore eroto error erte erter etete etext etio- etite etoro etree etter ettie exbi- exert exite exito exorb exore exort exter extre extro i-beo i-bet i-bot ibero ibert ibeti ibibo ibore iboxx ibrox iebet ieiri ierei ieroe iette iiiee iiiii iitti iobit iobox ioooi ioooo iorio iotit iotti irbit irete irite irobo irori irrit itbit itbox itero itete itext itire itobi itter ittoo ittre ittti o-r-b obbet obeie obert obete oboro obote obreb oeiro oirot oitti oo-er oobit ooioo ooooo oorie orbit orbix orbot