bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins biny bipp bips bis- bisp biss bisy biys bnib bnin bnpp bnss bsin bsns bspp bysb bysi bysp byss bysy i-by ibis ibns ibsn ibss ibyi iiii iiis iisi iisp inby inis inni inns inny inp- inpi inpp insp inss ipin ippy ipsi ipsp ipss isbn isin isis isps ispy issi issp isss issy isys n-ii nbpp nbps nbsp nibi nibs niip nini nins nips nisi nisp niss niyi nnnn nnpi nnss npin npss npsy nsin nsis nspi nsps nssb nssp nsss nyny nyss pbsp pibb pibi piip pini pinn pinp pins piny pipi pipp pips pipy pisi piss pisy piys pnin pnpp ppib pppn pppp ppps ppss psip psis psni pspi pspp psps psy- psys pyin pyn- pypy pyss s-ib s-ii sbbs sbsi sbsp sibi sibs siby sini sinn sinp sins siny sipi sipp sips sipy sisi siss sisy siyi snib snip snns snpp snsy snys spby spib spin spip spis spns spps spsp spss spy- spys ssbn ssby ssin ssis ssns ssps sssb sssi ssss syis syn- syns syny syss ybbs yins yips yiss ypsi ysby ysii ysnp yspi ysyb yyyy