iii iio iip iir iis iit io- ioi ioo iop ior ios iot ipi ipo ipp ipr ips ipt ir- iri iro irp irr irs irt is- isi iso isp isr iss ist iti ito itp its itt o-i oii oio oip oir ois oit oo- ooi ooo oop oor oos oot op- opi opo opp opr ops opt or- ori oro orp orr ors ort os- osi oso osp osr oss ost ot- oti oto otp otr ots ott p-p pii pio pip pir pis pit poi poo pop por pos pot ppi ppo ppp ppr pps ppt pri pro prp prr prs prt ps- psi pso psp psr pss pst pt- pti pto ptp ptr pts ptt rii rio rip rir ris rit roi roo rop ror ros rot rpi rpo rpp rpr rps rpt rri rrp rrr rrs rrt rsi rso rsp rsr rss rst rti rto rtp rtr rts rtt sii sio sip sir sis sit soi soo sop sor sos sot spi spo spp spr sps spt sr- sri sro srp srr srs srt ss- ssi sso ssp ssr sss sst sti sto stp str sts stt tii tio tip tir tis tit to- toi too top tor tos tot tpi tpo tpp tpr tps tpt tri tro trp trr trs trt tsi tso tsp tsr tss tst tti tto ttp ttr tts ttt