iiii iiis iiit iirs iisi iisp iisr iist iitr iitt ippr ipri ipsi ipsp ipss ipts iri- irip iris irps irri irrs irsp irti irtp irts isis isit ispr isps isri isrp issi issp issr isss isti istp istr ists itis itri itrs itsi itsp piip pipi pipp pips piri pirr pirs pisi piss pist piti pitr pits pitt pppp ppps ppss ppts pptt pri- prii pris prps prri prrs prsi prss prti prtp prtr psip psis pspi pspp pspr psps psrp psst psts 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 s-ii siit sipi sipp sips sipt siri sirp sirr sirs sirt sisi siss sist sit- siti sits sitt spip spir spis spit spps spri sprs spsp spss spst sptr spts sris srps srpt srsp srtp srtr ssis ssit ssps sspt ssri ssrs sssi ssss sstp ssts stip stir stis stit stpp stps stri strs stsi stss sttr tiit tip- tipi tipp tips tipt tiri tirr tirs tisi tiss tist titi titp tits titt tpir tppp tppr tprs tptp tptr tri- trip tris trit trpp trps trsi trst trtr tsis tsps tspt tssi tssr tsst tsts ttss tttt