iiii iiis iirs iisi iisp iisr inis inni innr inns inp- inpi inpp inri inrs insp inss ipin ippr ipri ipsi ipsp ipss iri- irin irip iris irps irri irrs irsp isin isis ispr isps isri isrp issi issp issr isss n-ii niip niir nini nins nipr nips nirs nisi nisp niss nnnn nnpi nnpr nnss npin npri npss nrpn nrps nrsp nsin nsis nsnr nspi nsps nssp nssr nsss piip pini pinn pinp pins pipi pipp pips piri pirn pirr pirs pisi piss pnin pnpp pppn pppp ppps ppss pri- prii prin pris prnp prps prri prrs prsi prss psip psis psni psnr pspi pspp pspr psps psrp riin riis rinn ripi ripp ripr rips riri rirs risi risp riss rnin rnsp rpii rppn rpps rrrr rrsp rsis rsnn rsnr rsps s-ii sini sinn sinp sins sipi sipp sips siri sirp sirr sirs sisi siss snip snir snns snpp snrs spin spip spir spis spns spps spri sprs spsp spss sris srni srnn srps srsp ssin ssis ssns ssps ssri ssrs sssi ssss