iii iip iir iis iit ipi ipp ipr ips ipt ir- iri irp irr irs irt is- isi isp isr iss ist iti itp its itt p-p pii pip pir pis pit ppi ppp ppr pps ppt pri prp prr prs prt ps- psi psp psr pss pst pt- pti ptp ptr pts ptt rii rip rir ris rit rpi rpp rpr rps rpt rri rrp rrr rrs rrt rsi rsp rsr rss rst rti rtp rtr rts rtt sii sip sir sis sit spi spp spr sps spt sr- sri srp srr srs srt ss- ssi ssp ssr sss sst sti stp str sts stt tii tip tir tis tit tpi tpp tpr tps tpt tri trp trr trs trt tsi tsp tsr tss tst tti ttp ttr tts ttt