-al a-a a-c aaa aac aae aaf aal aax ac- aca acc ace acf acl acx aea aec aee aef ael aex af- afa afc afe aff afl afx al- ala alc ale alf all alx ax- axa axe axl axx c-- caa cac cae caf cal cax cca ccc cce ccf ccl ccx ce- cea cec cee cef cel cex cfa cfc cfe cff cfl cfx cl- cla clc cle clf cll clx cxc cxf cxl cxx eaa eac eae eaf eal eax ec- eca ecc ece ecf ecl ecx eea eec eee eef eel eex ef- efa efc efe eff efl efx ela elc ele elf ell elx ex- exa exc exe exl exx faa fac fae faf fal fax fca fcc fce fcf fcl fcx fea fec fee fef fel fex ffa ffc ffe fff ffl ffx fla flc fle flf fll flx fxe fxx la- laa lac lae laf lal lax lca lcc lce lcf lcl lcx lea lec lee lef lel lex lfa lfc lfe lff lfl lfx lla llc lle llf lll lxc lxx xaa xac xaf xal xcf xcl xcx xee xel xex xfa xfe xfl xfx xla xlf xxl xxx