kkk kkm kkr kks kmk kmm kmo kms kok kom koo kor kos krk kro krr krs ksk ksm kso ksr kss m-o m-r mkk mkm mko mkr mks mmk mmm mmo mmr mms mok mom moo mor mos mrk mrm mro mrr mrs msk msm mso msr mss okk oko okr oks om- omm omo omr oms oo- ook oom ooo oor oos or- ork orm oro orr ors os- osk osm oso osr oss rkk rkm rko rks rmm rmo rmr rms rok rom roo ror ros rrk rrm rrr rrs rsk rsm rso rsr rss sk- skk skm sko skr sks smk smm smo smr sms sok som soo sor sos sr- srk srm sro srr srs ss- ssk ssm sso ssr sss