bbbb bbbs bbin bblb bbls bibb bibi bibl bibs biin biis bili bill bils bilu bin- bini binn bins binu birb biri birl birn birr birs biru bis- bisl biss bisu blin blir blis blls blni blss blub blur blus bnib bnin bnrr bnss bril brin bris brls brns brrr brrs brsb brsr brun brus bsin bsns bubb bubi bubs bubu buin buir buis buiu bulb buli bull buls bulu bunb buni bunn buns bunu bur- burb buri burl burn burr burs buru busi buss busu buus ibis ibns ibri ibsn ibss ibus iiii iiis iirs iisi iisr iisu ilin ilir ilis ill- illi ills ilni ilus inis inni innr inns innu inri inrs inss insu inui inul inun inus iri- iril irin iris irlb irri irrs irul irun irus isbl isbn isil isin isis isls isri issi issr isss issu isus iuiu iuss lblr lbrs libr libs libu liii liin liir liis lilb lili lill lils lilu linn lins liri lirl lirn lirr lirs liru lisi liss lisu liun lius llbs llll lrrr ls-r lsbu lssr lubs luin luis luli lull lulu luni lunn luns luri lurs lusi luss n-ii nibi nibs niir niiu nili nill nils nilu nini ninl nins nirs niru nisi nisl niss nisu niur nlls nlrb nnls nnnn nnsl nnss nrlb nrrl nsin nsis nslr nsls nsnr nsrl nssb nssr nsss nsub nubi nubl nubs nuin nuli null nunn nuns nuri nurl nurn nurr nurs nuru nusi nusl nuss nusu rbbb rbbr rbbs rbis rbsl rbss rib- ribs ribu riin riis rill rilu rinn riri rirs risi riss risu rius rlin rlls rnbr rnin rnli rrrr rrun rsbi rsis rsnn rsnr rssl rubb rubi rubs rubu ruin ruis rull runi runn runs ruri rurs ruru rusi russ rusu ruun s-ib s-ii sbbs sbsi sbus sibi sibs sibu sil- sili sill sils silu sini sinn sins sinu siri sirr sirs siru sisi siss sisu siui sius sl-i slib slir slln slrn slrs slsu slub slur snib snir snns snrs snub snur snus srib sris srni srnn srub ssbn ssbr ssin ssis ssns ssri ssrl ssrs sssb sssi ssss sub- subb subi subl subs suin suir suis sul- suli sull sulu sun- sunb suni sunn suns sunu sur- suri surn surr surs suru sus- susi suss susu suus ubbi ubii ubir ubis ubli ubls uirr ulli ullr ulul ulus uni- unii unin unir unis unni unns unrs uns- unus urbi urbs urib urin uris uriu urls urni urns urri ursi urss ursu urun urur urus usbl usbr usbs usin usis uslu usnr usnu ussb ussr usss ussu usui usul usun usus uulu uuni uuri uusi uuuu