-er ddd dde ddm ddp ddr de- ded dee dem dep der dmd dme dmm dmp dmr dpd dpe dpm dpp dpr drd dre drm drp drr ed- edd ede edm edp edr eed eee eem eep eer em- emd eme emm emp emr ep- epd epe epm epp epr erd ere erm erp err m-r mdd mde mdm mdp mdr med mee mem mep mer mmd mme mmm mmp mmr mpd mpe mpm mpp mpr mrd mre mrm mrp mrr p-p pdd pde pdm pdp pdr ped pee pem pep per pmd pme pmm pmp pmr ppd ppe ppm ppp ppr prd pre prm prp prr rdd rde rdm rdp rdr re- red ree rem rep rer rmd rme rmm rmp rmr rpd rpe rpm rpp rpr rrd rrm rrp rrr