-er -th eee eef eel eer eet eex ef- efe eff efh efl efr eft efx ehe ehf ehh ehl ehr eht ele elf elh ell elr elt elx ere erf erh erl err ert ete etf eth etl etr ett etx ex- exe exh exl exr ext exx fee fef feh fel fer fet fex ffe fff ffh ffl ffr fft ffx fhe fhf fhh fhl fhr fle flf fll flr flt flx fre frf frh frl frr frt fte ftf fth ftl ftr ftt ftx fxe fxr fxt fxx he- hee hef heh hel her het hex hfe hff hfh hfl hfr hft hhe hhf hhh hhl hhr hht hle hlf hlh hll hlr hlt hlx hr- hre hrf hrh hrl hrr hrt hte htf hth htl htr htt htx hxl lee lef leh lel ler let lex lfe lff lfh lfl lfr lft lfx lhf lhh lhr lht lhx lle llf lll llr llt lrf lrh lrr lrt lte ltf lth ltl ltr ltt ltx lxr lxx re- ree ref reh rel rer ret rex rfe rff rfh rfl rfr rft rh- rhe rhf rhh rhl rhr rht rle rlf rlh rll rlr rlt rrf rrh rrl rrr rrt rte rtf rtl rtr rtt rtx rxr t-x te- tee tef teh tel ter tet tex tfe tff tfh tfl tfr tft tfx th- the thf thh thl thr tht thx tle tlf tlh tll tlr tlt tlx tre trf trh trl trr trt trx tte ttf tth ttl ttr ttt ttx txe txf txl txt xee xel xer xet xex xfe xfh xfl xft xfx xht xlf xlr xlt xrf xrt xrx xtf xtr xtx xxl xxx