a-a a-c aaa aac aad aae aan ac- aca acc acd ace acn ad- ada adc add ade adn aea aec aed aee aen an- ana anc and ane ann c-- caa cac cad cae can cca ccc ccd cce ccn cda cdc cdd cde cdn ce- cea cec ced cee cen cn- cna cnc cnd cne cnn daa dac dad dae dan dca dcc dcd dce dcn dda ddc ddd dde ddn de- dea dec ded dee den dna dnc dnd dne dnn eaa eac ead eae ean ec- eca ecc ecd ece ecn ed- eda edc edd ede edn eea eec eed eee een en- ena enc end ene enn naa nac nad nae nan nca ncc ncd nce ncn nda ndc ndd nde ndn ne- nea nec ned nee nen nna nnc nne nnn