-er ddd dde ddf ddm ddo ddr ddz de- ded dee def dem deo der dez dfd dfe dff dfm dfo dfr dfz dmd dme dmf dmm dmo dmr dmz dod doe dof dom doo dor doz drd dre drm dro drr drz dzd dze dzo dzr ed- edd ede edf edm edo edr eed eee eef eem eeo eer ef- efd efe eff efm efo efr em- emd eme emf emm emo emr eo- eod eoe eof eom eoo eor erd ere erf erm ero err erz eze ezf ezo ezr ezz fdd fde fdf fdm fdo fdr fed fee fef fem feo fer fez ffd ffe fff ffm ffo ffr ffz fmd fme fmf fmm fmo fmr foe fof fom foo for foz frd fre frf frm fro frr fzd m-f m-o m-r mdd mde mdf mdm mdo mdr mdz med mee mef mem meo mer mez mfd mfe mff mfm mfo mfr mfz mmd mme mmf mmm mmo mmr mmz mod moe mof mom moo mor moz mrd mre mrf mrm mro mrr mrz mzf mzm odd ode odf odm odo odr oed oee oef oem oeo oer of- ofd ofe off ofm ofo ofr ofz om- omd ome omf omm omo omr omz oo- ood oof oom ooo oor or- ord ore orf orm oro orr orz oze ozm ozo ozz rdd rde rdf rdm rdo rdr re- red ree ref rem reo rer rez rfd rfe rff rfm rfo rfr rfz rmd rme rmf rmm rmo rmr rod roe rof rom roo ror roz rrd rrf rrm rrr rze rzm rzo zdf zdm zed zee zef zem zeo zer zez zfd zfr zmd zmm zo- zod zoe zof zom zoo zor zro zzr zzz