-er ddd dde ddm ddo ddr dds de- ded dee dem deo der des dmd dme dmm dmo dmr dms dod doe dom doo dor dos drd dre drm dro drr drs dsd dse dsm dso dsr dss ed- edd ede edm edo edr eds eed eee eem eeo eer ees em- emd eme emm emo emr ems eo- eod eoe eom eoo eor eos erd ere erm ero err ers es- esd ese esm eso esr ess m-o m-r mdd mde mdm mdo mdr mds med mee mem meo mer mes mmd mme mmm mmo mmr mms mod moe mom moo mor mos mrd mre mrm mro mrr mrs msd mse msm mso msr mss odd ode odm odo odr ods oed oee oem oeo oer oes om- omd ome omm omo omr oms oo- ood oom ooo oor oos or- ord ore orm oro orr ors os- osd ose osm oso osr oss rdd rde rdm rdo rdr rds re- red ree rem reo rer res rmd rme rmm rmo rmr rms rod roe rom roo ror ros rrd rrm rrr rrs rsd rse rsm rso rsr rss sdd sde sdm sdo sdr sds se- sed see sem seo ser ses smd sme smm smo smr sms sod soe som soo sor sos sr- srd sre srm sro srr srs ss- ssd sse ssm sso ssr sss