a-a a-c aaa aac aae aag aah aan aax ac- aca acc ace acg ach acn acx aea aec aee aeg aeh aen aex ag- aga agc age agg agh agn agx aha ahc ahe ahg ahh ahn ahx an- ana anc ane ang anh ann anx ax- axa axe axh axn axx c-- caa cac cae cag cah can cax cca ccc cce ccg cch ccn ccx ce- cea cec cee ceg ceh cen cex cga cgc cge cgg cgh cgn ch- cha chc che chg chh chn chx cn- cna cnc cne cng cnh cnn cnx cxc cxh cxx eaa eac eae eag eah ean eax ec- eca ecc ece ecg ech ecn ecx eea eec eee eeg een eex ega egc ege egg egh egn egx eha ehc ehe ehg ehh ehn en- ena enc ene eng enh enn ex- exa exc exe exh exx gaa gac gae gag gah gan gca gcc gce gcg gch gcn ge- gea gec gee geg geh gen gex gga ggc ggg ggh ggn gha ghc ghe ghg ghh ghn gna gnc gne gnn gxa haa hac hae hag hah han hax hca hcc hce hcg hch hcn he- hea hec hee heg heh hen hex hga hgc hge hgg hgh hgn hha hhc hhe hhg hhh hhn hna hnc hne hng hnh hnn hxc naa nac nae nag nah nan nax nca ncc nce ncg nch ncn ncx ne- nea nec nee neg neh nen nex nga ngc nge ngg ngh ngn nha nhc nhe nhg nhh nhn nna nnc nne nng nnh nnn nxc xaa xac xag xan xch xcx xee xeg xen xex xge xna xnc xxx