iii iio iir iis io- ioi ioo ior ios ir- iri iro irr irs is- isi iso isr iss izi izo izz o-i oii oio oir ois oiz oo- ooi ooo oor oos or- ori oro orr ors orz os- osi oso osr oss ozo ozs ozz rii rio rir ris riz roi roo ror ros roz rri rrr rrs rsi rso rsr rss rzo sii sio sir sis soi soo sor sos soz sr- sri sro srr srs ss- ssi sso ssr sss ssz szi szr zio zir zis ziz zo- zoi zoo zor zos zro zrs zsi zsz zzr zzs zzz