-al a-a a-c aaa aac aae aaf aag aal aan ac- aca acc ace acf acg acl acn aea aec aee aef aeg ael aen af- afa afc afe aff afg afl afn ag- aga agc age agf agg agl agn al- ala alc ale alf alg all aln an- ana anc ane anf ang anl ann c-- caa cac cae caf cag cal can cca ccc cce ccf ccg ccl ccn ce- cea cec cee cef ceg cel cen cfa cfc cfe cff cfg cfl cfn cga cgc cge cgg cgl cgn cl- cla clc cle clf clg cll cln cn- cna cnc cne cnf cng cnl cnn eaa eac eae eaf eag eal ean ec- eca ecc ece ecf ecg ecl ecn eea eec eee eef eeg eel een ef- efa efc efe eff efg efl ega egc ege egf egg egl egn ela elc ele elf elg ell eln en- ena enc ene enf eng enl enn faa fac fae faf fag fal fan fca fcc fce fcf fcg fcl fcn fea fec fee fef feg fel fen ffa ffc ffe fff ffg ffl ffn fga fgc fge fgf fgg fgl fgn fla flc fle flf flg fll fln fna fnc fne fnf fng fnl fnn gaa gac gae gaf gag gal gan gca gcc gce gcf gcg gcl gcn ge- gea gec gee gef geg gel gen gfa gfc gfe gff gfl gga ggc ggg ggn gla glc gle glf glg gll gln gna gnc gne gnf gnl gnn la- laa lac lae laf lag lal lan lca lcc lce lcf lcg lcl lcn lea lec lee lef leg lel len lfa lfc lfe lff lfg lfl lfn lga lgc lge lgf lgg lgl lgn lla llc lle llf llg lll lln lna lnc lne lng lnl lnn naa nac nae naf nag nal nan nca ncc nce ncf ncg ncl ncn ne- nea nec nee nef neg nel nen nfa nfc nfe nff nfl nfn nga ngc nge ngf ngg ngl ngn nla nlc nle nlf nlg nll nln nna nnc nne nnf nng nnl nnn