-er ddd dde ddf ddl ddr ddt de- ded dee def del der det dfd dfe dff dfl dfr dft dl- dld dle dlf dll dlr dlt drd dre drl drr drt dtd dte dtf dtl dtr dtt ed- edd ede edf edl edr edt eed eee eef eel eer eet ef- efd efe eff efl efr eft eld ele elf ell elr elt erd ere erf erl err ert etd ete etf etl etr ett fdd fde fdf fdl fdr fdt fed fee fef fel fer fet ffd ffe fff ffl ffr fft fld fle flf fll flr flt frd fre frf frl frr frt ftd fte ftf ftl ftr ftt ldd lde ldf ldl ldr ldt led lee lef lel ler let lfd lfe lff lfl lfr lft lld lle llf lll llr llt lrd lrf lrr lrt ltd lte ltf ltl ltr ltt rdd rde rdf rdl rdr rdt re- red ree ref rel rer ret rfd rfe rff rfl rfr rft rld rle rlf rll rlr rlt rrd rrf rrl rrr rrt rtd rte rtf rtl rtr rtt tdd tde tdf tdl tdr tdt te- ted tee tef tel ter tet tfd tfe tff tfl tfr tft tld tle tlf tll tlr tlt trd tre trf trl trr trt ttd tte ttf ttl ttr ttt