-er ddd dde ddm ddo ddp ddr de- ded dee dem deo dep der dmd dme dmm dmo dmp dmr dod doe dom doo dop dor dpd dpe dpm dpo dpp dpr drd dre drm dro drp drr ed- edd ede edm edo edp edr eed eee eem eeo eep eer em- emd eme emm emo emp emr eo- eod eoe eom eoo eop eor ep- epd epe epm epo epp epr erd ere erm ero erp err m-o m-r mdd mde mdm mdo mdp mdr med mee mem meo mep mer mmd mme mmm mmo mmp mmr mod moe mom moo mop mor mpd mpe mpm mpo mpp mpr mrd mre mrm mro mrp mrr odd ode odm odo odp odr oed oee oem oeo oep oer om- omd ome omm omo omp omr oo- ood oom ooo oop oor op- opd ope opm opo opp opr or- ord ore orm oro orp orr p-p pdd pde pdm pdo pdp pdr ped pee pem peo pep per pmd pme pmm pmo pmp pmr pod poe pom poo pop por ppd ppe ppm ppo ppp ppr prd pre prm pro prp prr rdd rde rdm rdo rdp rdr re- red ree rem reo rep rer rmd rme rmm rmo rmp rmr rod roe rom roo rop ror rpd rpe rpm rpo rpp rpr rrd rrm rrp rrr