m-o m-r mmm mmo mmr mms mmz mom moo mor mos moz mrm mro mrr mrs mrz msm mso msr mss mzm om- omm omo omr oms omz oo- oom ooo oor oos or- orm oro orr ors orz os- osm oso osr oss ozm ozo ozs ozz rmm rmo rmr rms rom roo ror ros roz rrm rrr rrs rsm rso rsr rss rzm rzo smm smo smr sms smz som soo sor sos soz sr- srm sro srr srs ss- ssm sso ssr sss ssz szr zmm zms zo- zom zoo zor zos zro zrs zsm zsz zzr zzs zzz