-er eee eef eel eer eet ef- efe eff efl efr eft ele elf ell elr elt ere erf erl err ert ete etf etl etr ett fee fef fel fer fet ffe fff ffl ffr fft fle flf fll flr flt fre frf frl frr frt fte ftf ftl ftr ftt lee lef lel ler let lfe lff lfl lfr lft lle llf lll llr llt lrf lrr lrt lte ltf ltl ltr ltt re- ree ref rel rer ret rfe rff rfl rfr rft rle rlf rll rlr rlt rrf rrl rrr rrt rte rtf rtl rtr rtt te- tee tef tel ter tet tfe tff tfl tfr tft tle tlf tll tlr tlt tre trf trl trr trt tte ttf ttl ttr ttt