iii iio iir iis iki ikk iko ikr iks io- ioi ioo ior ios ir- iri irk iro irr irs is- isi isk iso isr iss kii kik kio kir kis kki kkk kkr kks koi kok koo kor kos kri krk kro krr krs ksi ksk kso ksr kss o-i oii oik oio oir ois oki okk oko okr oks oo- ooi ook ooo oor oos or- ori ork oro orr ors os- osi osk oso osr oss rii rik rio rir ris rkk rko rks roi rok roo ror ros rri rrk rrr rrs rsi rsk rso rsr rss sii sik sio sir sis sk- ski skk sko skr sks soi sok soo sor sos sr- sri srk sro srr srs ss- ssi ssk sso ssr sss