a-a a-c a-t aaa aac aad aae aaf aan aat ac- aca acc acd ace acf acn act ad- ada adc add ade adf adn adt aea aec aed aee aef aen aet af- afa afc afd afe aff afn aft an- ana anc and ane anf ann ant at- ata atc atd ate atf atn att c-- caa cac cad cae caf can cat cca ccc ccd cce ccf ccn cct cda cdc cdd cde cdf cdn cdt ce- cea cec ced cee cef cen cet cfa cfc cfd cfe cff cfn cft cn- cna cnc cnd cne cnf cnn cnt cta ctc ctd cte ctf ctn ctt daa dac dad dae daf dan dat dca dcc dcd dce dcf dcn dct dda ddc ddd dde ddf ddn ddt de- dea dec ded dee def den det dfa dfc dfd dfe dff dfn dft dna dnc dnd dne dnf dnn dnt dta dtc dtd dte dtf dtn dtt eaa eac ead eae eaf ean eat ec- eca ecc ecd ece ecf ecn ect ed- eda edc edd ede edf edn edt eea eec eed eee eef een eet ef- efa efc efd efe eff eft en- ena enc end ene enf enn ent eta etc etd ete etf etn ett faa fac fad fae faf fan fat fca fcc fcd fce fcf fcn fct fda fdc fdd fde fdf fdn fdt fea fec fed fee fef fen fet ffa ffc ffd ffe fff ffn fft fna fnc fnd fne fnf fnn fnt fta ftc ftd fte ftf ftn ftt naa nac nad nae naf nan nat nca ncc ncd nce ncf ncn nct nda ndc ndd nde ndf ndn ndt ne- nea nec ned nee nef nen net nfa nfc nfd nfe nff nfn nft nna nnc nne nnf nnn nnt nta ntc ntd nte ntf ntn ntt taa tac tad tae taf tan tat tca tcc tcd tce tcf tcn tct tda tdc tdd tde tdf tdn tdt te- tea tec ted tee tef ten tet tfa tfc tfd tfe tff tfn tft tna tnc tnd tne tnf tnn tnt tta ttc ttd tte ttf ttn ttt