iiii iiis iirs iisi iisp iisr inis inni innr inns inp- inpi inpp inri inrs insp inss invs ipin ippr ipri ipsi ipsp ipss ipvs iri- irin irip iris irps irri irrs irsp irvs isin isis ispr isps isri isrp issi issp issr isss ivin ivrs n-ii niip niir nini nins nipr nips nirs nirv nisi nisp niss nivr nnnn nnpi nnpr nnss npin npiv npri npss nrpn nrps nrsp nrsv nsin nsis nsnr nspi nsps nssp nssr nsss nvir nvis nvpi nvss piip pini pinn pinp pins pipi pipp pips piri pirn pirr pirs pisi piss pnin pnpp pppn pppp ppps ppss pri- prii prin pris priv prnp prps prri prrs prsi prss prsv psip psis psni psnr pspi pspp pspr psps psrp riin riis rinn ripi ripp ripr rips riri rirs risi risp riss rivp rivs rnin rnpv rnsp rpii rppn rpps rrrr rrsp rsis rsnn rsnr rsps rsvp rvsp s-ii s-iv sini sinn sinp sins sipi sipp sips siri sirp sirr sirs sisi siss sivi snip snir snns snpp snrs snvi spin spip spir spis spiv spns spps spri sprs spsp spss sris srni srnn srps srsp srvn ssin ssis ssns ssps ssri ssrs sssi ssss ssvp svir svns viii vini vins vipr vips viri virr visi visn visp viss vivi vnir vrin vris vrnn vrpn vrsi vsip vsrp vvvv