bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins bint binu biny bis- biss bist bisu bisy bits bitt bitu biys 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 busy but- buti buts butt buty buus buyi buys buyu byit bysb bysi byss byst bysy byts byun i-by ibis ibns ibsn ibss ibtb ibts ibus ibuy ibyi iiii iiis iiit iisi iist iisu iitt inby inis init inni inns innu inny inss inst insu inti intn ints intu inui inun inus isbn isbt isin isis isit isnt issi isss issu issy isti ists isty isus isys itbs itby itin itis itsi itsu itsy itty iuiu iuss iust iuty n-ii nbti nbty nibi nibs niit niiu nini nins nisi niss nist nisu nitb niti nits nity niyi nnit nnnn nnss nntn nsin nsis nssb nsss nsts nstu nsub ntis ntnu ntsb ntss ntsu ntui nubi nubs nuby nuin nuit nunn nuns nunt nuny nusi nuss nust nusu nusy nuts nutt nutu nuys nyit nynt nyny nyss nyst nytb s-ib s-ii sbbs sbsi sbst sbtn sbus sibi sibs sibu siby siit sini sinn sins sint sinu siny sisi siss sist sisu sisy sit- siti sitn sits sitt situ sity siui sius siut siyi siyu snib snit snns snsy snub snus snys ssbn ssby ssin ssis ssit ssns sssb sssi ssss sstb ssts stbs stib stis stit stnn stns stsi stss stub stun stus stut stuy stys sub- subb subi subs suin suis suit sun- sunb suni sunn suns sunt sunu suny sus- susi suss sust susu susy suti sutu suty suus suyi suyn suyu syis syn- syns synu syny syss syst sytt syun tbbs tbit tbst tibi tibs tibu tiit tiiu tini tinn tins tint tinu tiny tisb tisi tiss tist titi tits titt titu tiyi tiyn tnts tnut tsin tsis tssi tsst tsts tsui tsun tsys ttbb ttss tttt ttys tubb tubs tubu tuin tuis tuit tuiu tunb tuni tunn tuns tunu tuny tusi tuss tust tuti tuts tutt tutu tuty tuyn tuys tybi tyin tynt tyny tyss tyst tyti tytt tyty tyus tyyn ubbi ubii ubis ubit uint uist uits uni- unii unin unis unit unni unns uns- unst untb unts unty unus unut usbs usin usis usnu ussb usss usst ussu ussy ustb usti usts usui usun usus utby utin utis utti uttu uuni uusi uuuu uuyn uyin uyts ybbs yins yiss yist yiti ysby ysii yssu ysyb yubu yuin yuit yuns yuny yust yutu yuty yuyu yyyy