iiii iiis iisi iisp inis inni inns inp- inpi inpp insp inss invs ipin ipsi ipsp ipss ipvs isin isis isps issi issp isss ivin n-ii niip nini nins nips nisi nisp niss nnnn nnpi nnss npin npiv npss nsin nsis nspi nsps nssp nsss nvis nvpi nvss piip pini pinn pinp pins pipi pipp pips pisi piss pnin pnpp pppn pppp ppps ppss psip psis psni pspi pspp psps s-ii s-iv sini sinn sinp sins sipi sipp sips sisi siss sivi snip snns snpp snvi spin spip spis spiv spns spps spsp spss ssin ssis ssns ssps sssi ssss ssvp svns viii vini vins vips visi visn visp viss vivi vsip vvvv