bbbb bbbs bbeb bebb bebe bebi beeb beef beer bees befe beff beir beis bere beri berr bers beru bes- bese bess beur bffs bfsi bfsr bibb bibe bibi bibs bieb bief bier bies bieu biff bifi biis birb bire biri birr birs biru bis- bise biss bisu breb bree bref brei brer bres brfu brie bris brrr brrs brsb brsr brue brus bseb bsee bser bses bsff bsfs bsse bubb bube bubi bubs bubu buer bueu bufe buff bufr buie buif buir buis buiu bur- burb bure buri burr burs buru buse busi buss busu buus ebbr ebbs eber ebes ebis ebru ebur ebus eeee eees eefe eers eese eesi efbr efes effi effs efsi eiei eier eies eifs eire eirs eise eiss erbb erbe ereb erei erer eres erfs erie eris eriu erre errs erse ersi erub erur erus esbs esee eser eses esfs esie esis esri esse essi essu esuf esui esus eubi euer eufi eur- eure euse fbis fbrs fbus febs feeb feer fees fefe feff fefi feie feir feis ferb fere ferr fers feru fese fess feus ffee ffff ffii ffrr ffss fibe fibs fief fier fies fife fiff fifi fiii fire firs fise fisi fiss fisu free frei fres frib frie fris frsb frub frue fsfi fssf fubb fubs fubu fuff fufu fuir fur- fure furi furr furs fuse fusi fuss fusu i-be ibes ibfi ibie ibis ibri ibsf ibss ibus ieie iere ieri iers iesi iesr iesu ifbb ifer ifes ifis ifrb ifrf ifri ifsb iies iiie iiii iiis iirs iisi iisr iisu irbe iree irer ires irfe irfu iri- irie iris irre irri irrs irse irsf irus isbe iseb isee iser ises isie isis isri isse issf issi issr isss issu isus iuef iuiu iuse iuss rbbb rbbr rbbs rbis rbss rebb rebe rebs rebu reeb reef rees refe reff refi refr refs refu reif reii reir reis reiu rere reri rers reru rese resi ress reue reuf reus reuu rfef rib- ribe ribs ribu rief rier ries rieu rife riff rifs rifu riif riis rire riri rirs rise risi riss risu riue rius rrif rrrr rsbi rsee rsis rsre rubb rube rubi rubs rubu ruer rues rufe ruff ruif ruis rure ruri rurs ruru ruse rusi russ rusu s-ib s-ii sbbs sbef sber sbse sbsi sbus se-e se-f se-i se-s se-u sebe sebi sebs seeb seef seer sees seeu seff sefi seie seif seii seir seis seiu serb sere serf seri serr sers seru sese sesi sess seui seur sfer sfss sfsu sibe sibi sibs sibu sief sier sies sife siff sifr sifu sire sirf siri sirr sirs siru sise sisi siss sisu siue siui sius sreb sres srfi srib sris srub ssbr ssee sses ssis ssri ssrs sssb sssf sssi ssss sub- subb subi subs suee suer sues sueu suf- suff sufi sufr sufs sufu suie suir suis sur- sure surf suri surr surs suru sus- suse susi suss susu suus u-ie ubbe ubbi uber ubii ubir ubis ueir uers uess ufer uffe uies uirr uise urbe urbi urbs ure- ures urfe urff urfi urib urie urif uris uriu urre urri urse ursi urss ursu urur urus usbe usbr usbs usee usef user uses usfi usfs usie usif usis ussb usse ussf ussr usss ussu usui usus uuri uusi uuuu