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