bbbb bbbs bbeb bebb bebe bebi beeb beer bees beir beis bere beri berr bers beru bes- bese bess beur beux bibb bibe bibi bibs bieb bier bies bieu biis birb bire biri birr birs biru birx bis- bise biss bisu bixi breb bree brei brer bres brex brie bris brix brrr brrs brsb brsr brue brus brux bseb bsee bser bses bsix bsse bubb bube bubi bubs bubu buer bueu buie buir buis buiu buix bur- burb bure buri burr burs buru buse busi buss busu busx buus ebbr ebbs eber ebes ebis ebix ebru ebur ebus eeee eees eers eese eesi eiei eier eies eire eirs eise eiss er-x erbb erbe ereb erei erer eres erie eris eriu erre errs erse ersi erub erur erus esbs esee eser eses esie esis esri esse essi essu esui esus eubi euer eur- eure euse exer exes exis exrx i-be ibes ibex ibie ibis ibri ibss ibus ieie iere ieri iers iesi iesr iesu iies iiie iiii iiis iirs iisi iisr iisu irbe iree irer ires irex iri- irie iris irix irre irri irrs irse irus isbe isbx iseb isee iser ises isie isis isri isse issi issr isss issu isus iuiu iuse iuss ixxi rbbb rbbr rbbs rbis rbss rebb rebe rebs rebu reeb rees reii reir reis reiu rere reri rers reru rese resi ress reue reus reuu reux rexx rib- ribe ribs ribu rier ries rieu riex riis rire riri rirs rise risi riss risu riue rius rixe rrrr rsbi rsee rsis rsre rubb rube rubi rubs rubu ruer rues ruis rure ruri rurs ruru ruse rusi russ rusu rxes s-ib s-ii sbbs sber sbse sbsi sbus se-e se-i se-s se-u se-x sebe sebi sebs seeb seer sees seeu seex seie seii seir seis seiu seix serb sere seri serr sers seru sese sesi sess seui seur seux sex- sexe sexi sibe sibi sibs sibu sier sies siex sire siri sirr sirs siru sise sisi siss sisu siue siui sius sixe sixx sreb sres srib sris srub ssbr ssee sses ssex ssis ssri ssrs sssb sssi ssss sub- subb subi subs suee suer sues sueu suie suir suis sur- sure suri surr surs suru sus- suse susi suss susu suus sux- suxe u-ie ubbe ubbi uber ubii ubir ubis ueir uers uess uies uirr uise urbe urbi urbs ure- ures urex urib urie uris uriu urix urre urri urse ursi urss ursu urur urus usbe usbr usbs usee user uses usie usis usix ussb usse ussr usss ussu usui usus uuri uusi uuuu uxue uxus xbee xeer xer- xers xeus xexe xibe xibu xiii xisi xixi xuri xurs xuxu xxii xxix xxxi xxxx