-er ddd dde ddm ddp ddr dds de- ded dee dem dep der des dmd dme dmm dmp dmr dms dpd dpe dpm dpp dpr dps drd dre drm drp drr drs dsd dse dsm dsp dsr dss ed- edd ede edm edp edr eds eed eee eem eep eer ees em- emd eme emm emp emr ems ep- epd epe epm epp epr eps erd ere erm erp err ers es- esd ese esm esp esr ess m-r mdd mde mdm mdp mdr mds med mee mem mep mer mes mmd mme mmm mmp mmr mms mpd mpe mpm mpp mpr mps mrd mre mrm mrp mrr mrs msd mse msm msp msr mss p-p pdd pde pdm pdp pdr pds ped pee pem pep per pes pmd pme pmm pmp pmr pms ppd ppe ppm ppp ppr pps prd pre prm prp prr prs ps- psd pse psm psp psr pss rdd rde rdm rdp rdr rds re- red ree rem rep rer res rmd rme rmm rmp rmr rms rpd rpe rpm rpp rpr rps rrd rrm rrp rrr rrs rsd rse rsm rsp rsr rss sdd sde sdm sdp sdr sds se- sed see sem sep ser ses smd sme smm smp smr sms spd spe spm spp spr sps sr- srd sre srm srp srr srs ss- ssd sse ssm ssp ssr sss