-er ddd dde ddf ddm ddo ddr dds de- ded dee def dem deo der des dfd dfe dff dfm dfo dfr dfs dmd dme dmf dmm dmo dmr dms dod doe dof dom doo dor dos drd dre drm dro drr drs dsd dse dsf dsm dso dsr dss ed- edd ede edf edm edo edr eds eed eee eef eem eeo eer ees ef- efd efe eff efm efo efr efs em- emd eme emf emm emo emr ems eo- eod eoe eof eom eoo eor eos erd ere erf erm ero err ers es- esd ese esf esm eso esr ess fdd fde fdf fdm fdo fdr fds fed fee fef fem feo fer fes ffd ffe fff ffm ffo ffr ffs fmd fme fmf fmm fmo fmr fms foe fof fom foo for fos frd fre frf frm fro frr frs fsd fse fsf fsm fso fsr fss m-f m-o m-r mdd mde mdf mdm mdo mdr mds med mee mef mem meo mer mes mfd mfe mff mfm mfo mfr mfs mmd mme mmf mmm mmo mmr mms mod moe mof mom moo mor mos mrd mre mrf mrm mro mrr mrs msd mse msf msm mso msr mss odd ode odf odm odo odr ods oed oee oef oem oeo oer oes of- ofd ofe off ofm ofo ofr ofs om- omd ome omf omm omo omr oms oo- ood oof oom ooo oor oos or- ord ore orf orm oro orr ors os- osd ose osf osm oso osr oss rdd rde rdf rdm rdo rdr rds re- red ree ref rem reo rer res rfd rfe rff rfm rfo rfr rfs rmd rme rmf rmm rmo rmr rms rod roe rof rom roo ror ros rrd rrf rrm rrr rrs rsd rse rsf rsm rso rsr rss sdd sde sdf sdm sdo sdr sds se- sed see sef sem seo ser ses sfd sfe sff sfm sfo sfr sfs smd sme smf smm smo smr sms sod soe sof som soo sor sos sr- srd sre srf srm sro srr srs ss- ssd sse ssf ssm sso ssr sss