a-a a-c aaa aac aae aam aan ac- aca acc ace acm acn aea aec aee aem aen ama amc ame amm amn an- ana anc ane anm ann c-- caa cac cae cam can cca ccc cce ccm ccn ce- cea cec cee cem cen cma cmc cme cmm cmn cn- cna cnc cne cnm cnn eaa eac eae eam ean ec- eca ecc ece ecm ecn eea eec eee eem een em- ema emc eme emm emn en- ena enc ene enm enn maa mac mae mam man mc- mca mcc mce mcm mcn mea mec mee mem men mma mmc mme mmm mmn mna mnc mne mnm mnn naa nac nae nam nan nca ncc nce ncm ncn ne- nea nec nee nem nen nma nmc nme nmm nmn nna nnc nne nnm nnn