bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins bint binu bis- biss bist bisu bits bitt bitu bnib bnin bnss bsin bsns bsts btss bttb btus bubb bubi bubs bubu buin buis buit buiu bunb buni bunn buns bunt bunu busi buss bust busu but- buti buts butt buus ibis ibns ibsn ibss ibtb ibts ibus iiii iiis iiit iisi iist iisu iitt inis init inni inns innu inss inst insu inti intn ints intu inui inun inus isbn isbt isin isis isit isnt issi isss issu isti ists isus itbs itin itis itsi itsu iuiu iuss iust n-ii nbti nibi nibs niit niiu nini nins nisi niss nist nisu nitb niti nits nnit nnnn nnss nntn nsin nsis nssb nsss nsts nstu nsub ntis ntnu ntsb ntss ntsu ntui nubi nubs nuin nuit nunn nuns nunt nusi nuss nust nusu nuts nutt nutu s-ib s-ii sbbs sbsi sbst sbtn sbus sibi sibs sibu siit sini sinn sins sint sinu sisi siss sist sisu sit- siti sitn sits sitt situ siui sius siut snib snit snns snub snus ssbn ssin ssis ssit ssns sssb sssi ssss sstb ssts stbs stib stis stit stnn stns stsi stss stub stun stus stut sub- subb subi subs suin suis suit sun- sunb suni sunn suns sunt sunu sus- susi suss sust susu suti sutu suus tbbs tbit tbst tibi tibs tibu tiit tiiu tini tinn tins tint tinu tisb tisi tiss tist titi tits titt titu tnts tnut tsin tsis tssi tsst tsts tsui tsun ttbb ttss tttt tubb tubs tubu tuin tuis tuit tuiu tunb tuni tunn tuns tunu tusi tuss tust tuti tuts tutt tutu ubbi ubii ubis ubit uint uist uits uni- unii unin unis unit unni unns uns- unst untb unts unus unut usbs usin usis usnu ussb usss usst ussu ustb usti usts usui usun usus utin utis utti uttu uuni uusi uuuu