iiii iiis iiit iirs iisi iisp iisr iist iitr iitt inis init inni innr inns inp- inpi inpp inpt inri inrs insp inss inst inti intn intp intr ints ipin ippr ipri ipsi ipsp ipss ipts iri- irin irip iris irps irri irrs irsp irti irtp irts isin isis isit isnt ispr isps isri isrp issi issp issr isss isti istp istr ists itin itis itri itrs itsi itsp n-ii niip niir niit nini nins nipr nips nipt nirs nirt nisi nisp niss nist niti nitr nits nnit nnnn nnpi nnpr nnss nntn npin npri nprt npss nptn nrpn nrps nrsp nrts nsin nsis nsnr nspi nsps nssp nssr nsss nstp nsts ntis ntss nttr piip pini pinn pinp pins pint pipi pipp pips piri pirn pirr pirs pisi piss pist piti pitr pits pitt pnin pnpp pntr pppn pppp ppps ppss pptn ppts pptt pri- prii prin pris prnp prps prri prrs prsi prss prti prtp prtr psip psis psni psnr pspi pspp pspr psps psrp psst psts riin riis rinn ripi ripp ripr rips ript riri rirs risi risp riss rist riti rits ritt rnin rnnt rnsp rntp rpii rppn rpps rptn rpts rrrr rrsp rsis rsnn rsnr rsps rstp rsts rtns rtps rtss rttp rtts s-ii siit sini sinn sinp sins sint sipi sipp sips sipt siri sirp sirr sirs sirt sisi siss sist sit- siti sitn sits sitt snip snir snit snns snpp snrs sntr spin spip spir spis spit spns spps spri sprs spsp spss spst sptr spts sris srni srnn srps srpt srsp srtp srtr ssin ssis ssit ssns ssps sspt ssri ssrs sssi ssss sstp ssts stip stir stis stit stnn stnr stns stpp stps stri strn strs stsi stss sttr tiit tini tinn tins tint tip- tipi tipp tips tipt tiri tirr tirs tisi tiss tist titi titp tits titt tnsp tnts tpir tppp tppr tprs tptp tptr tri- trin trip tris trit trpn trpp trps trsi trst trtr tsin tsis tspn tsps tspt tssi tssr tsst tsts ttss tttt