-er c-- ccc ccd cce ccm cco ccp ccr cdc cdd cde cdm cdo cdp cdr ce- cec ced cee cem ceo cep cer cmc cmd cme cmm cmo cmp cmr co- coc cod coe com coo cop cor cpc cpd cpe cpm cpo cpp cpr crc crd cre crm cro crp crr dcc dcd dce dcm dco dcp dcr ddc ddd dde ddm ddo ddp ddr de- dec ded dee dem deo dep der dmc dmd dme dmm dmo dmp dmr doc dod doe dom doo dop dor dpc dpd dpe dpm dpo dpp dpr drc drd dre drm dro drp drr ec- ecc ecd ece ecm eco ecr ed- edc edd ede edm edo edp edr eec eed eee eem eeo eep eer em- emc emd eme emm emo emp emr eo- eoc eod eoe eom eoo eop eor ep- epc epd epe epm epo epp epr erc erd ere erm ero erp err m-o m-r mc- mcc mcd mce mcm mco mcp mcr mdc mdd mde mdm mdo mdp mdr mec med mee mem meo mep mer mmc mmd mme mmm mmo mmp mmr moc mod moe mom moo mop mor mpc mpd mpe mpm mpo mpp mpr mrc mrd mre mrm mro mrp mrr oc- occ ocd ocm oco ocp ocr odc odd ode odm odo odp odr oec oed oee oem oeo oep oer om- omc omd ome omm omo omp omr oo- ooc ood oom ooo oop oor op- opc opd ope opm opo opp opr or- orc ord ore orm oro orp orr p-p pcc pcd pce pcm pco pcp pcr pdc pdd pde pdm pdo pdp pdr pec ped pee pem peo pep per pmc pmd pme pmm pmo pmp pmr poc pod poe pom poo pop por ppc ppd ppe ppm ppo ppp ppr prc prd pre prm pro prp prr rcc rcd rce rcm rco rcp rcr rdc rdd rde rdm rdo rdp rdr re- rec red ree rem reo rep rer rmc rmd rme rmm rmo rmp rmr roc rod roe rom roo rop ror rpc rpd rpe rpm rpo rpp rpr rrc rrd rrm rrp rrr