iiii iiis iiit iirs iisi iisp iisr iist iitr iitt ippr ippy ipri ipsi ipsp ipss ipts iri- irip iris iriy irps irri irrs irsp irti irtp irts isis isit ispr isps ispy isri isrp issi issp issr isss issy isti istp istr ists isty isys itis itri itrs itry itsi itsp itsy itty iypt piip pipi pipp pips pipy piri pirr pirs piry pisi piss pist pisy piti pitr pits pitt pity piys pppp ppps ppss ppts pptt pri- prii pris prps prri prrs prsi prss prti prtp prtr prys psip psis pspi pspp pspr psps psrp psst psts psy- psys pypy pyr- pyri pyry pyss pyst pytt riis ripi ripp ripr rips ript riri rirs risi risp riss rist riti rits ritt rpii rpps rpts rrrr rrsp rsis rsps rstp rsts rtps rtss rttp rtts ryip ryis rysy rytt ryyt s-ii siit sipi sipp sips sipt sipy siri sirp sirr sirs sirt sisi siss sist sisy sit- siti sits sitt sity siyi spip spir spis spit spps spri sprs spry spsp spss spst sptr spts spy- spyr spys sris srps srpt srsp srtp srtr ssis ssit ssps sspt ssri ssrs sssi ssss sstp ssts stip stir stis stit stpp stps stri strs stry stsi stss sttr styr stys syis syrs syrt syry syss syst sytt tiit tip- tipi tipp tips tipt tiri tirr tirs tiry tisi tiss tist titi titp tits titt tiyi tpir tppp tppr tprs tptp tptr tri- trip tris trit trpp trps trsi trst trtr try- tryp trys tsis tsps tspt tssi tssr tsst tsts tsys ttss tttt ttys tyir typ- typp typy tyr- tyrr tyss tyst tyti tytt tyty yips yirr yiss yist yiti yitp ypir ypsi ysii yspi yyyy