c-- ccc ccm cco ccr ccs cmc cmm cmo cmr cms cmy co- coc com coo cor cos coy crc crm cro crr crs cry csc csm cso csr css csy cyc cym cyo cyr cys m-o m-r mc- mcc mcm mco mcr mcs mmc mmm mmo mmr mms moc mom moo mor mos moy mrc mrm mro mrr mrs mry msc msm mso msr mss msy my- myc mym myo myr mys oc- occ ocm oco ocr ocs om- omc omm omo omr oms omy oo- ooc oom ooo oor oos or- orc orm oro orr ors ory os- osc osm oso osr oss oyo oys rcc rcm rco rcr rcs rmc rmm rmo rmr rms roc rom roo ror ros roy rrc rrm rrr rrs rsc rsm rso rsr rss ry- ryc rym ryo ryr rys ryy scc scm sco scr scs smc smm smo smr sms smy soc som soo sor sos soy sr- src srm sro srr srs sry ss- ssc ssm sso ssr sss sy- syc sym syr sys ycc yco ycs ycy ymc ymm ymo yms yoc yom yoo yor yos yoy yrc yro yrs ysc ysm yso ysr yss ysy yyc yys yyy