bbbb bbbs bbin bblb bbls bibb bibi bibl bibs biin biis bili bill bils bilt bilu bin- bini binn bins bint binu bis- bisl biss bist bisu bits bitt bitu blbt blin blis blit blls blni blss blst blts blub blus blut bnib bnin bnss bsin bsns bsts btss bttb btus bubb bubi bubs bubu buin buis buit buiu bulb buli bull buls bult bulu bunb buni bunn buns bunt bunu busi buss bust busu but- buti buts butt buus ibis ibns ibsn ibss ibtb ibtl ibts ibus iiii iiis iiit iisi iist iisu iitt ilin ilis ilit ill- illi ills illt ilni ilts ilus ilut inis init inni inns innu inss inst insu inti intl intn ints intu inui inul inun inus isbl isbn isbt isil isin isis isit isls isnt issi isss issu isti ists isus itbs itil itin itis itll itsi itsu iuiu iuss iust libs libu liii liin liis lilb lili lill lils lilt lilu linn lins lint lisi liss list lisu litb liti litl lits litt litu liun lius liut llbs llll lnts lsbu lsts ltbl ltib ltns ltnt ltsi lubs luin luis luit luli lull lulu luni lunn luns lunt lusi luss lust luti luts n-ii nbti nibi nibs niit niiu nili nill nils nilt nilu nini ninl nins nisi nisl niss nist nisu nitb niti nits nlls nnit nnls nnnn nnsl nnss nntn nsin nsis nsls nssb nsss nstl nsts nstu nsub ntis ntnu ntsb ntss ntsu ntui nubi nubl nubs nuin nuit nuli null nunn nuns nunt nusi nusl nuss nust nusu nuts nutt nutu s-ib s-ii sbbs sbsi sbst sbtn sbus sibi sibs sibu siit sil- sili sill sils silt silu sini sinn sins sint sinu sisi siss sist sisu sit- siti sitn sits sitt situ siui sius siut sl-i slib slit slln slst slsu slts slub slut snib snit snns snub snus ssbn ssin ssis ssit sslt ssns sssb sssi ssss sstb sstl ssts stbs stib stil stis stit stln stlt stnn stns stsi stss stub stul stun stus stut sub- subb subi subl subs suin suis suit sul- suli sull sult sulu sun- sunb suni sunn suns sunt sunu sus- susi suss sust susu suti sutu suus tbbs tbil tbit tbst tibi tibs tibu tiit tiiu till tiln tils tilt tini tinn tins tint tinu tisb tisi tiss tist titi tits titt titu tlli tnts tnut tsin tsis tssi tsst tsts tsui tsun ttbb ttss tttt ttul tubb tubs tubu tuil tuin tuis tuit tuiu tuli tull tulu tunb tuni tunn tuns tunu tusi tuss tust tuti tutl tuts tutt tutu ubbi ubii ubis ubit ubli ubls uint uist uits ulli ulti ults ultt ulul ulus uni- unii unin unis unit unni unns uns- unst untb unts unus unut usbl usbs usin usis uslu usnu ussb usss usst ussu ustb usti usts usui usul usun usus util utin utis utsl utti uttu uulu uuni uusi uuuu