a-a a-c aaa aac aad aae aaf aan ac- aca acc acd ace acf acn ad- ada adc add ade adf adn aea aec aed aee aef aen af- afa afc afd afe aff afn an- ana anc and ane anf ann c-- caa cac cad cae caf can cca ccc ccd cce ccf ccn cda cdc cdd cde cdf cdn ce- cea cec ced cee cef cen cfa cfc cfd cfe cff cfn cn- cna cnc cnd cne cnf cnn daa dac dad dae daf dan dca dcc dcd dce dcf dcn dda ddc ddd dde ddf ddn de- dea dec ded dee def den dfa dfc dfd dfe dff dfn dna dnc dnd dne dnf dnn eaa eac ead eae eaf ean ec- eca ecc ecd ece ecf ecn ed- eda edc edd ede edf edn eea eec eed eee eef een ef- efa efc efd efe eff en- ena enc end ene enf enn faa fac fad fae faf fan fca fcc fcd fce fcf fcn fda fdc fdd fde fdf fdn fea fec fed fee fef fen ffa ffc ffd ffe fff ffn fna fnc fnd fne fnf fnn naa nac nad nae naf nan nca ncc ncd nce ncf ncn nda ndc ndd nde ndf ndn ne- nea nec ned nee nef nen nfa nfc nfd nfe nff nfn nna nnc nne nnf nnn