iiii iiis iiit iisi iisp iist iitt ilis ilit ill- illi illp ills illt ilts ipil ipsi ipsp ipss ipts isil isis isit isls isps issi issp isss isti istp ists itil itis itll itsi itsp liii liis lili lill lils lilt lip- lipi lipl lipp lips lisi lisp liss list liti litl lits litt llll llps lppl lpss lspl lssp lsts ltps ltsi ltsp piip pil- pili pill pils pilt pipi pipp pips pisi piss pist piti pits pitt plip plis plit plpp plsi plss pltt ppli pppp ppps ppss ppts pptt psil psip psis pspi pspp psps psst psts s-ii siit sil- sili sill sils silt sipi sipp sips sipt sisi siss sist sit- siti sits sitt sl-i slip slit sllp slpi slpp slps slst slts spip spis spit splp spls spps spsp spss spst spts ssis ssit sslp sslt sspl ssps sspt sssi ssss sstl sstp ssts stil stip stis stit stlt stpp stps stsi stss tiit till tils tilt tip- tipi tipp tips tipt tisi tiss tist titi titp tits titt tlli tpls tppp tptp tsis tsps tspt tssi tsst tsts ttss tttt