iiii iiis iiit iisi iisp iist iitt inis init inni inns inp- inpi inpp inpt insp inss inst inti intn intp ints ipin ipsi ipsp ipss ipts isin isis isit isnt isps issi issp isss isti istp ists itin itis itsi itsp n-ii niip niit nini nins nips nipt nisi nisp niss nist niti nits nnit nnnn nnpi nnss nntn npin npss nptn nsin nsis nspi nsps nssp nsss nstp nsts ntis ntss piip pini pinn pinp pins pint pipi pipp pips pisi piss pist piti pits pitt pnin pnpp pppn pppp ppps ppss pptn ppts pptt psip psis psni pspi pspp psps psst psts s-ii siit sini sinn sinp sins sint sipi sipp sips sipt sisi siss sist sit- siti sitn sits sitt snip snit snns snpp spin spip spis spit spns spps spsp spss spst spts ssin ssis ssit ssns ssps sspt sssi ssss sstp ssts stip stis stit stnn stns stpp stps stsi stss tiit tini tinn tins tint tip- tipi tipp tips tipt tisi tiss tist titi titp tits titt tnsp tnts tppp tptp tsin tsis tspn tsps tspt tssi tsst tsts ttss tttt