a-a a-c aaa aac aae aaf aam aan ac- aca acc ace acf acm acn aea aec aee aef aem aen af- afa afc afe aff afm afn ama amc ame amf amm amn an- ana anc ane anf anm ann c-- caa cac cae caf cam can cca ccc cce ccf ccm ccn ce- cea cec cee cef cem cen cfa cfc cfe cff cfm cfn cma cmc cme cmf cmm cmn cn- cna cnc cne cnf cnm cnn eaa eac eae eaf eam ean ec- eca ecc ece ecf ecm ecn eea eec eee eef eem een ef- efa efc efe eff efm em- ema emc eme emf emm emn en- ena enc ene enf enm enn faa fac fae faf fam fan fca fcc fce fcf fcm fcn fea fec fee fef fem fen ffa ffc ffe fff ffm ffn fma fmc fme fmf fmm fmn fna fnc fne fnf fnm fnn m-f maa mac mae maf mam man mc- mca mcc mce mcf mcm mcn mea mec mee mef mem men mfa mfc mfe mff mfm mfn mma mmc mme mmf mmm mmn mna mnc mne mnf mnm mnn naa nac nae naf nam nan nca ncc nce ncf ncm ncn ne- nea nec nee nef nem nen nfa nfc nfe nff nfn nma nmc nme nmm nmn nna nnc nne nnf nnm nnn