iiii iiis iiit iisi iisp iist iitt ipix ippy ipsi ipsp ipss ipts isis isit isps ispy issi issp isss issy isti istp ists isty isys itis itsi itsp itsy itty ixxi iypt piip pipi pipp pips pipy pisi piss pist pisy piti pits pitt pitx pity pixx pixy 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 sixt sixx siyi spip spis spit spix spps spsp spss spst spts spy- spys ssis ssit ssps sspt sspx sssi ssss sstp ssts stip stis stit stix stpp stps stsi stss stys styx syis syss syst sytt syxt tiit tip- tipi tipp tips tipt tisi tiss tist titi titp tits titt tixt tiyi tppp tptp tsis tsix tsps tspt tssi tsst tsts tsys ttss tttt ttys txii typ- typp typy tyss tyst tyti tytt tyty tyxt xiii xisi xist xixi xxii xxix xxxi xxxx xxxy xyst yips yiss yist yiti yitp ypsi ysii yspi yyyy