bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins binu biny birb biri birn birr birs biru biry bis- biss bisu bisy biys bnib bnin bnrr bnss brin bris brns brrr brrs brsb brsr brun brus bry- bryn bsin bsns bubb bubi bubs bubu 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 i-by ibis ibns ibri ibsn ibss ibus ibuy ibyi iiii iiis iirs iisi iisr iisu inby inis inni innr inns innu inny inri inrs inss insu inui inun inus irby iri- irin iris iriy irri irrs irun irus iryn isbn isin isis isri issi issr isss issu issy isus isys iuiu iuss n-ii nibi nibs niir niiu nini nins nirs niru nisi niss nisu niur niyi nnnn nnss nsin nsis nsnr nssb nssr nsss nsub nubi nubs nuby nuin nunn nuns nuny nuri nurn nurr nurs nuru nusi nuss nusu nusy nuys nyny nyrb nyss rbbb rbbr rbbs rbis rbss rib- ribs ribu riby riin riis rinn riny riri rirs risi riss risu rius rnbr rnin rrrr rrun rsbi rsis rsnn rsnr rubb rubi rubs rubu ruby ruin ruis runi runn runs runy ruri rurs ruru rusi russ rusu rusy ruun ruyi ruys ryis rynn rysy ryun s-ib s-ii sbbs sbsi sbus sibi sibs sibu siby sini sinn sins sinu siny siri sirr sirs siru sisi siss sisu sisy siui sius siyi siyu snib snir snns snrs snsy snub snur snus snys srby srib sris srni srnn srub ssbn ssbr ssby ssin ssis ssns ssri ssrs sssb sssi ssss sub- subb subi subs suin suir suis sun- sunb suni sunn suns sunu suny sur- suri surn surr surs suru sury sus- susi suss susu susy suus suyi suyn suyr suyu syis syn- syns synu syny syrs syry syss syun ubbi ubii ubir ubis uirr uni- unii unin unir unis unni unns unrs uns- unus urbi urbs urib urin uris uriu urni urns urri urry ursi urss ursu ursy urun urur urus uryn usbr usbs usin usis usnr usnu ussb ussr usss ussu ussy usui usun usus uuni uuri uusi uuuu uuyn uyin uyir ybbs ybry yins yirb yirn yirr yiss yrin yrun yryn ysby ysii yssu ysyb yubu yuin yuns yuny yuri yurn yury yuyu yyyy