iii iio iir iis iit io- ioi ioo ior ios iot ir- iri iro irr irs irt is- isi iso isr iss ist iti ito its itt itz izi izo izz o-i oii oio oir ois oit oiz oo- ooi ooo oor oos oot or- ori oro orr ors ort orz os- osi oso osr oss ost ot- oti oto otr ots ott otz ozo ozs ozt ozz rii rio rir ris rit riz roi roo ror ros rot roz rri rrr rrs rrt rsi rso rsr rss rst rti rto rtr rts rtt rtz rzo sii sio sir sis sit soi soo sor sos sot soz sr- sri sro srr srs srt ss- ssi sso ssr sss sst ssz sti sto str sts stt stz szi szr tii tio tir tis tit tiz to- toi too tor tos tot toz tri tro trr trs trt trz tsi tso tsr tss tst tti tto ttr tts ttt tzs zio zir zis zit ziz zo- zoi zoo zor zos zot zro zrs zsi zst zsz ztr zzr zzs zzt zzz