-er ddd dde ddf ddl ddm ddr de- ded dee def del dem der dfd dfe dff dfl dfm dfr dl- dld dle dlf dll dlm dlr dmd dme dmf dml dmm dmr drd dre drl drm drr ed- edd ede edf edl edm edr eed eee eef eel eem eer ef- efd efe eff efl efm efr eld ele elf ell elm elr em- emd eme emf eml emm emr erd ere erf erl erm err fdd fde fdf fdl fdm fdr fed fee fef fel fem fer ffd ffe fff ffl ffm ffr fld fle flf fll flm flr fmd fme fmf fml fmm fmr frd fre frf frl frm frr ldd lde ldf ldl ldm ldr led lee lef lel lem ler lfd lfe lff lfl lfm lfr lld lle llf lll llm llr lmd lme lmf lml lmm lmr lrd lrf lrm lrr m-f m-r mdd mde mdf mdl mdm mdr med mee mef mel mem mer mfd mfe mff mfl mfm mfr mld mle mlf mll mlm mlr mmd mme mmf mml mmm mmr mrd mre mrf mrl mrm mrr rdd rde rdf rdl rdm rdr re- red ree ref rel rem rer rfd rfe rff rfl rfm rfr rld rle rlf rll rlm rlr rmd rme rmf rml rmm rmr rrd rrf rrl rrm rrr