bbbb bbbs bbfn bbin bffs bfsi bfsr bibb bibi bibs biff bifi biin biis bin- bini binn bins binu biny birb biri birn birr birs biru biry bis- biss bisu bisy biys bnib bnin bnrr bnss brfu brin bris brns brrr brrs brsb brsr brun brus bry- bryn bsff bsfs bsin bsns bubb bubi bubs bubu buff bufr buif buin buir buis buiu bunb buni bunn buns bunu bur- burb buri burn burr burs buru bury busi buss busu busy buus buyi buys buyu byrn bysb bysi byss bysy byun fbis fbrs fbus ffff ffii ffrr ffss ffun fibs fiff fifi fiii fini finn fins firn firs firy fisi fiss fisu fnrs fnuf frib frin fris frns frsb frub frun frys fsfi fssf fubb fubs fubu fuff fufu fuir funf funs fur- furi furn furr furs fury fusi fuss fusu fuyu fyfi fynn fyrs fyry i-by ibfi ibis ibns ibri ibsf ibsn ibss ibus ibuy ibyi ifbb ifby iffy ifis ifni ifnr ifns ifrb ifrf ifri ifsb iiii iiis iirs iisi iisr iisu inby infi infs infy inis inni innr inns innu inny inri inrs inss insu inui inun inus irby irfu iri- irin iris iriy irri irrs irsf irun irus iryn isbn isin isis isri issf issi issr isss issu issy isus isys iuiu iuss n-ii nbuf nfff nfib nfrs nfsr nfsu nfyb nibi nibs niff niir niiu nini nins nirs niru nisi niss nisu niur niyi nnnn nnss nsfs nsin nsis nsnr nssb nssf nssr nsss nsub nubi nubs nuby nuff nuin nunn nuns nuny nuri nurn nurr nurs nuru nusi nuss nusu nusy nuys nyny nyrb nyrf nysf nyss rbbb rbbr rbbs rbis rbss rib- ribs ribu riby riff rifs rifu riif riin riis rinf rinn riny riri rirs risi riss risu rius riyf rnbr rnin rrif rrrr rrun rsbi rsis rsnn rsnr rubb rubi rubs rubu ruby ruff ruif ruin ruis runf runi runn runs runy ruri rurs ruru rusi russ rusu rusy ruun ruyi ruys ryff ryif ryis rynn rysy ryun ryyf s-ib s-ii sbbs sbsi sbus sfnb sfss sfsu sibi sibs sibu siby siff sifr sifu sify sini sinn sins sinu siny sirf siri sirr sirs siru sisi siss sisu sisy siui sius siyi siyu snfu snib snir snns snrs snsy snub snur snus snys srby srfi srib sris srni srnn srub ssbn ssbr ssby ssin ssis ssns ssri ssrs sssb sssf sssi ssss sub- subb subi subs suf- suff sufi sufr sufs sufu suin suir suis sun- sunb suni sunn suns sunu suny sur- surf suri surn surr surs suru sury sus- susi suss susu susy suus suyi suyn suyr suyu syff syfy syis syn- syns synu syny syrs syry syss syun ubbi ubii ubir ubis uirr uni- unif unii unin unir unis unni unns unrf unrs uns- unus urbi urbs urff urfi urib urif urin uris uriu urni urns urri urry ursi urss ursu ursy urun urur urus uryn usbr usbs usfi usfs usif usin usis usnr usnu ussb ussf ussr usss ussu ussy usui usun usus uuni uuri uusi uuuu uuyn uyin uyir ybbs ybry yiff yins yirb yirn yirr yiss yrin yrun yryn ysby ysii yssu ysyb yubu yuff yufu yuin yuns yuny yuri yurn yury yuyu yyff yyyy