i-v iii iio iir iis iki ikk iko ikr iks ikv io- ioi ioo ior ios iov ir- iri irk iro irr irs irv is- isi isk iso isr iss isv ivi ivo ivr ivs ivv kii kik kio kir kis kiv kki kkk kkr kks kkv koi kok koo kor kos kri krk kro krr krs krv ksi ksk kso ksr kss ksv kvi kvk kvo kvr kvs kvv o-i oii oik oio oir ois oiv oki okk oko okr oks oo- ooi ook ooo oor oos oov or- ori ork oro orr ors orv os- osi osk oso osr oss osv ov- ovi ovo ovs ovv rii rik rio rir ris riv rkk rko rks rkv roi rok roo ror ros rov rri rrk rrr rrs rsi rsk rso rsr rss rsv rvi rvo rvr rvs rvv sii sik sio sir sis siv sk- ski skk sko skr sks soi sok soo sor sos sov sr- sri srk sro srr srs srv ss- ssi ssk sso ssr sss ssv svi svk svo svr svs svv vi- vii vik vio vir vis viv voi vok voo vor vos vov vri vrk vrr vrs vsi vsk vso vsr vss vsv vvi vvo vvr vvs vvv