-er ddd dde ddm ddr dds de- ded dee dem der des dmd dme dmm dmr dms drd dre drm drr drs dsd dse dsm dsr dss ed- edd ede edm edr eds eed eee eem eer ees em- emd eme emm emr ems erd ere erm err ers es- esd ese esm esr ess m-r mdd mde mdm mdr mds med mee mem mer mes mmd mme mmm mmr mms mrd mre mrm mrr mrs msd mse msm msr mss rdd rde rdm rdr rds re- red ree rem rer res rmd rme rmm rmr rms rrd rrm rrr rrs rsd rse rsm rsr rss sdd sde sdm sdr sds se- sed see sem ser ses smd sme smm smr sms sr- srd sre srm srr srs ss- ssd sse ssm ssr sss