-er eee eef eeg eel eer eex ef- efe eff efg efl efr efx ege egf egg egl egr egu egx ele elf elg ell elr elu elx ere erf erg erl err eru eu- eue euf eug eul eur eux ex- exe exl exr exu exx fee fef feg fel fer feu fex ffe fff ffg ffl ffr ffu ffx fge fgf fgg fgl fgr fle flf flg fll flr flu flx fre frf frg frl frr fru fue fuf fug ful fur fuu fux fxe fxg fxr fxu fxx ge- gee gef geg gel ger geu gex gfe gff gfl gfr gfx ggg ggr ggu gle glf glg gll glr glu glx gre grf grg grl grr gru grx gu- gue guf gug gul gur guu gxf gxl lee lef leg lel ler leu lex lfe lff lfg lfl lfr lfu lfx lge lgf lgg lgl lgr lgu lle llf llg lll llr llu lrf lrg lrr lru lue luf lug lul lur luu lux lxr lxx re- ree ref reg rel rer reu rex rfe rff rfg rfl rfr rfu rge rgf rgg rgr rgx rle rlf rlg rll rlr rlu rrf rrg rrl rrr rru rue ruf rug rur ruu rux rxr uee uef ueg uel uer ufe uff ufg ufl ufr ufu ufx uge ugf ugg ugl ugr ugu ugx ule ulf ulg ull ulr ulu ur- ure urf urg url urr uru urx uue uug uur uuu uxf uxr uxu xee xeg xel xer xeu xex xfe xfl xfx xge xgl xlf xlg xlr xrf xrx xue xul xxl xxx