i-v iii iio iip iir iis iit io- ioi ioo iop ior ios iot iov ipi ipo ipp ipr ips ipt ipv ir- iri iro irp irr irs irt irv is- isi iso isp isr iss ist isv iti ito itp its itt itv ivi ivo ivp ivr ivs ivt ivv o-i oii oio oip oir ois oit oiv oo- ooi ooo oop oor oos oot oov op- opi opo opp opr ops opt opv or- ori oro orp orr ors ort orv os- osi oso osp osr oss ost osv ot- oti oto otp otr ots ott otv ov- ovi ovo ovp ovs ovv p-p pii pio pip pir pis pit piv poi poo pop por pos pot pov ppi ppo ppp ppr pps ppt ppv pri pro prp prr prs prt prv ps- psi pso psp psr pss pst psv pt- pti pto ptp ptr pts ptt ptv pvi pvo pvp pvr pvs pvt pvv rii rio rip rir ris rit riv roi roo rop ror ros rot rov rpi rpo rpp rpr rps rpt rpv rri rrp rrr rrs rrt rsi rso rsp rsr rss rst rsv rti rto rtp rtr rts rtt rtv rvi rvo rvp rvr rvs rvt rvv sii sio sip sir sis sit siv soi soo sop sor sos sot sov spi spo spp spr sps spt spv sr- sri sro srp srr srs srt srv ss- ssi sso ssp ssr sss sst ssv sti sto stp str sts stt stv svi svo svp svr svs svt svv tii tio tip tir tis tit tiv to- toi too top tor tos tot tov tpi tpo tpp tpr tps tpt tpv tri tro trp trr trs trt trv tsi tso tsp tsr tss tst tsv tti tto ttp ttr tts ttt ttv tvi tvo tvp tvr tvs tvt vi- vii vio vip vir vis vit viv voi voo vop vor vos vot vov vpi vpo vpp vpr vps vpt vri vrp vrr vrs vrt vsi vso vsp vsr vss vst vsv vti vto vtr vts vtt vtv vvi vvo vvr vvs vvt vvv