iiii iiis iiit iisi iisp iist iitt ippy ipsi ipsp ipss ipts isis isit isps ispy issi issp isss issy isti istp ists isty isys itis itsi itsp itsy itty iypt piip pipi pipp pips pipy pisi piss pist pisy piti pits pitt pity piys pppp ppps ppss ppts pptt psip psis pspi pspp psps psst psts psy- psys pypy pyss pyst pytt s-ii siit sipi sipp sips sipt sipy sisi siss sist sisy sit- siti sits sitt sity siyi spip spis spit spps spsp spss spst spts spy- spys ssis ssit ssps sspt sssi ssss sstp ssts stip stis stit stpp stps stsi stss stys syis syss syst sytt tiit tip- tipi tipp tips tipt tisi tiss tist titi titp tits titt tiyi tppp tptp tsis tsps tspt tssi tsst tsts tsys ttss tttt ttys typ- typp typy tyss tyst tyti tytt tyty yips yiss yist yiti yitp ypsi ysii yspi yyyy