bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins bint biny bis- biss bist bisy bits bitt biys bnib bnin bnss bsin bsns bsts btss bttb byit bysb bysi byss byst bysy byts i-by ibis ibns ibsn ibss ibtb ibts ibyi iiii iiis iiit iisi iist iitt inby inis init inni inns inny inss inst inti intn ints isbn isbt isin isis isit isnt issi isss issy isti ists isty isys itbs itby itin itis itsi itsy itty n-ii nbti nbty nibi nibs niit nini nins nisi niss nist nitb niti nits nity niyi nnit nnnn nnss nntn nsin nsis nssb nsss nsts ntis ntsb ntss nyit nynt nyny nyss nyst nytb s-ib s-ii sbbs sbsi sbst sbtn sibi sibs siby siit sini sinn sins sint siny sisi siss sist sisy sit- siti sitn sits sitt sity siyi snib snit snns snsy snys ssbn ssby ssin ssis ssit ssns sssb sssi ssss sstb ssts stbs stib stis stit stnn stns stsi stss stys syis syn- syns syny syss syst sytt tbbs tbit tbst tibi tibs tiit tini tinn tins tint tiny tisb tisi tiss tist titi tits titt tiyi tiyn tnts tsin tsis tssi tsst tsts tsys ttbb ttss tttt ttys tybi tyin tynt tyny tyss tyst tyti tytt tyty tyyn ybbs yins yiss yist yiti ysby ysii ysyb yyyy