-er c-- ccc ccd cce ccm cco ccr ccs cdc cdd cde cdm cdo cdr cds ce- cec ced cee cem ceo cer ces cmc cmd cme cmm cmo cmr cms co- coc cod coe com coo cor cos crc crd cre crm cro crr crs csc csd cse csm cso csr css dcc dcd dce dcm dco dcr dcs ddc ddd dde ddm ddo ddr dds de- dec ded dee dem deo der des dmc dmd dme dmm dmo dmr dms doc dod doe dom doo dor dos drc drd dre drm dro drr drs dsc dsd dse dsm dso dsr dss ec- ecc ecd ece ecm eco ecr ecs ed- edc edd ede edm edo edr eds eec eed eee eem eeo eer ees em- emc emd eme emm emo emr ems eo- eoc eod eoe eom eoo eor eos erc erd ere erm ero err ers es- esc esd ese esm eso esr ess m-o m-r mc- mcc mcd mce mcm mco mcr mcs mdc mdd mde mdm mdo mdr mds mec med mee mem meo mer mes mmc mmd mme mmm mmo mmr mms moc mod moe mom moo mor mos mrc mrd mre mrm mro mrr mrs msc msd mse msm mso msr mss oc- occ ocd ocm oco ocr ocs odc odd ode odm odo odr ods oec oed oee oem oeo oer oes om- omc omd ome omm omo omr oms oo- ooc ood oom ooo oor oos or- orc ord ore orm oro orr ors os- osc osd ose osm oso osr oss rcc rcd rce rcm rco rcr rcs rdc rdd rde rdm rdo rdr rds re- rec red ree rem reo rer res rmc rmd rme rmm rmo rmr rms roc rod roe rom roo ror ros rrc rrd rrm rrr rrs rsc rsd rse rsm rso rsr rss scc scd sce scm sco scr scs sdc sdd sde sdm sdo sdr sds se- sec sed see sem seo ser ses smc smd sme smm smo smr sms soc sod soe som soo sor sos sr- src srd sre srm sro srr srs ss- ssc ssd sse ssm sso ssr sss