iiii iiis iirs iisi iisp iisr iisu ippr ippy ipri ipsi ipsp ipss ipur ipus iri- irip iris iriy irps irri irrs irsp irus isis ispr isps ispy isri isrp issi issp issr isss issu issy isup isus isys iuiu iupp iuss piip pipi pipp pips pipy piri pirr pirs piru piry pisi piss pisu pisy pius piys pppp ppps ppru ppss ppur pri- prii pris prps prri prrs prsi prss prus pruu prys psip psis pspi pspp pspr psps psrp psy- psys puir puis puiu pupi pups pupu pupy pur- puri purp purr purs puru pury pusi puss puy- puyi puys pypy pyr- pyri pyry pyss riis ripi ripp ripr rips riri rirs risi risp riss risu rius rpii rpps rrrr rrsp rsis rsps ruis rupp rupy ruri rurp rurs ruru rusi russ rusu rusy ruyi ruys ryip ryis rysy s-ii sipi sipp sips sipy siri sirp sirr sirs siru sisi siss sisu sisy siui sius siyi siyu spip spir spis spps spri sprs spry spsp spss spui spur spus spy- spyr spys sris srps srsp ssis ssps ssri ssrs sssi ssss suir suis sup- supp supr sups supy sur- suri surp surr surs suru sury sus- susi susp suss susu susy suus suyi suyr suyu syis syrs syry syss u-rp uipi uirr upis uppp uppu uppy upri upsi upsy upup uris uriu urri urry ursi urss ursu ursy urup urur urus usip usis uspp usps ussr usss ussu ussy usui usus uuri uusi uuuu uyir yips yirr yiss ypir ypsi ysii yspi yssu yupi yups yuri yury yuyu yyyy