iiii iiis iiit iirs iisi iisp iisr iist iisu iitr iitt ippr ipri ipsi ipsp ipss ipts ipur ipus iput iri- irip iris irps irri irrs irsp irti irtp irts irus isis isit ispr isps isri isrp issi issp issr isss issu isti istp istr ists isup isus itis itri itrs itsi itsp itsu itup itur iuiu iupp iuss iust piip pipi pipp pips piri pirr pirs piru pisi piss pist pisu piti pitr pits pitt pitu pius pppp ppps ppru ppss ppts pptt ppur pri- prii pris prps prri prrs prsi prss prti prtp prtr prus prut pruu psip psis pspi pspp pspr psps psrp psst psts pstu ptui puir puis puit puiu pupi pups pupu pur- puri purp purr purs puru pusi puss pust put- puti puts putt putu riis ripi ripp ripr rips ript riri rirs risi risp riss rist risu riti rits ritt ritu rius rpii rpps rpts rrrr rrsp rsis rsps rstp rsts rstu rtps rtss rttp rtts ruis ruit rupp rupt ruri rurp rurs ruru rusi russ rust rusu ruti ruts rutt rutu s-ii siit sipi sipp sips sipt siri sirp sirr sirs sirt siru sisi siss sist sisu sit- siti sits sitt situ siui sius siut spip spir spis spit spps spri sprs spsp spss spst sptr spts spui spur spus sput sris srps srpt srsp srtp srtr ssis ssit ssps sspt ssri ssrs sssi ssss sstp ssts stip stir stis stit stpp stps stri strs stru stsi stss sttr stup stur stus stut suir suis suit sup- supp supr sups supt sur- suri surp surr surs surt suru sus- susi susp suss sust susu suti sutu suus tiit tiiu tip- tipi tipp tips tipt tipu tiri tirr tirs tiru tisi tiss tist titi titp tits titt titu tpir tppp tppr tprs tptp tptr tput tri- trip tris trit trpp trps trsi trst trtr trus trut truu tsis tsps tspt tssi tssr tsst tsts tsui tsup ttss tttt tuis tuit tuiu tupi tups tupu turi turp turr turs turt turu tusi tuss tust tuti tuts tutt tutu u-rp uipi uirr uist uits upis uppp uppu upri upsi upup uris uriu urri ursi urss ursu urts urup urur urus urut usip usis uspp usps ussr usss usst ussu usti ustp usts usui usus utis utri utti uttu uuri uusi uuuu