-al a-a a-c aaa aac aae aaf aal aan aax ac- aca acc ace acf acl acn acx aea aec aee aef ael aen aex af- afa afc afe aff afl afn afx al- ala alc ale alf all aln alx an- ana anc ane anf anl ann anx ax- axa axe axl axn axx c-- caa cac cae caf cal can cax cca ccc cce ccf ccl ccn ccx ce- cea cec cee cef cel cen cex cfa cfc cfe cff cfl cfn cfx cl- cla clc cle clf cll cln clx cn- cna cnc cne cnf cnl cnn cnx cxc cxf cxl cxx eaa eac eae eaf eal ean eax ec- eca ecc ece ecf ecl ecn ecx eea eec eee eef eel een eex ef- efa efc efe eff efl efx ela elc ele elf ell eln elx en- ena enc ene enf enl enn ex- exa exc exe exl exx faa fac fae faf fal fan fax fca fcc fce fcf fcl fcn fcx fea fec fee fef fel fen fex ffa ffc ffe fff ffl ffn ffx fla flc fle flf fll fln flx fna fnc fne fnf fnl fnn fnx fxe fxx la- laa lac lae laf lal lan lax lca lcc lce lcf lcl lcn lcx lea lec lee lef lel len lex lfa lfc lfe lff lfl lfn lfx lla llc lle llf lll lln lna lnc lne lnl lnn lxc lxx naa nac nae naf nal nan nax nca ncc nce ncf ncl ncn ncx ne- nea nec nee nef nel nen nex nfa nfc nfe nff nfl nfn nla nlc nle nlf nll nln nlx nna nnc nne nnf nnl nnn nxc nxl xaa xac xaf xal xan xcf xcl xcx xee xel xen xex xfa xfe xfl xfn xfx xla xlf xna xnc xxl xxx