iiii iiis iirs iisi iisp iisr ippr ippy ipri ipsi ipsp ipss iri- irip iris iriy irps irri irrs irsp isis ispr isps ispy isri isrp issi issp issr isss issy isys piip pipi pipp pips pipy piri pirr pirs piry pisi piss pisy piys pppp ppps ppss pri- prii pris prps prri prrs prsi prss prys psip psis pspi pspp pspr psps psrp psy- psys pypy pyr- pyri pyry pyss riis ripi ripp ripr rips riri rirs risi risp riss rpii rpps rrrr rrsp rsis rsps ryip ryis rysy s-ii sipi sipp sips sipy siri sirp sirr sirs sisi siss sisy siyi spip spir spis spps spri sprs spry spsp spss spy- spyr spys sris srps srsp ssis ssps ssri ssrs sssi ssss syis syrs syry syss yips yirr yiss ypir ypsi ysii yspi yyyy