-er ddd dde ddf ddl ddr de- ded dee def del der dfd dfe dff dfl dfr dl- dld dle dlf dll dlr drd dre drl drr ed- edd ede edf edl edr eed eee eef eel eer ef- efd efe eff efl efr eld ele elf ell elr erd ere erf erl err fdd fde fdf fdl fdr fed fee fef fel fer ffd ffe fff ffl ffr fld fle flf fll flr frd fre frf frl frr ldd lde ldf ldl ldr led lee lef lel ler lfd lfe lff lfl lfr lld lle llf lll llr lrd lrf lrr rdd rde rdf rdl rdr re- red ree ref rel rer rfd rfe rff rfl rfr rld rle rlf rll rlr rrd rrf rrl rrr