c-- ccc ccd ccm cco ccr ccs cdc cdd cdm cdo cdr cds cmc cmd cmm cmo cmr cms co- coc cod com coo cor cos crc crd crm cro crr crs csc csd csm cso csr css dcc dcd dcm dco dcr dcs ddc ddd ddm ddo ddr dds dmc dmd dmm dmo dmr dms doc dod dom doo dor dos drc drd drm dro drr drs dsc dsd dsm dso dsr dss m-o m-r mc- mcc mcd mcm mco mcr mcs mdc mdd mdm mdo mdr mds mmc mmd mmm mmo mmr mms moc mod mom moo mor mos mrc mrd mrm mro mrr mrs msc msd msm mso msr mss oc- occ ocd ocm oco ocr ocs odc odd odm odo odr ods om- omc omd omm omo omr oms oo- ooc ood oom ooo oor oos or- orc ord orm oro orr ors os- osc osd osm oso osr oss rcc rcd rcm rco rcr rcs rdc rdd rdm rdo rdr rds rmc rmd rmm rmo rmr rms roc rod rom roo ror ros rrc rrd rrm rrr rrs rsc rsd rsm rso rsr rss scc scd scm sco scr scs sdc sdd sdm sdo sdr sds smc smd smm smo smr sms soc sod som soo sor sos sr- src srd srm sro srr srs ss- ssc ssd ssm sso ssr sss