a-a a-c aaa aac aae aaf aah aan ac- aca acc ace acf ach acn aea aec aee aef aeh aen af- afa afc afe aff afh afn aha ahc ahe ahf ahh ahn an- ana anc ane anf anh ann c-- caa cac cae caf cah can cca ccc cce ccf cch ccn ce- cea cec cee cef ceh cen cfa cfc cfe cff cfh cfn ch- cha chc che chf chh chn cn- cna cnc cne cnf cnh cnn eaa eac eae eaf eah ean ec- eca ecc ece ecf ech ecn eea eec eee eef een ef- efa efc efe eff efh eha ehc ehe ehf ehh ehn en- ena enc ene enf enh enn faa fac fae faf fah fan fca fcc fce fcf fcn fea fec fee fef feh fen ffa ffc ffe fff ffh ffn fha fhc fhe fhf fhh fhn fna fnc fne fnf fnh fnn haa hac hae haf hah han hca hcc hce hcf hch hcn he- hea hec hee hef heh hen hfa hfc hfe hff hfh hfn hha hhc hhe hhf hhh hhn hna hnc hne hnf hnh hnn naa nac nae naf nah nan nca ncc nce ncf nch ncn ne- nea nec nee nef neh nen nfa nfc nfe nff nfn nha nhc nhe nhf nhh nhn nna nnc nne nnf nnh nnn