a-a a-c aaa aac aad aae aaf aam ac- aca acc acd ace acf acm ad- ada adc add ade adf adm aea aec aed aee aef aem af- afa afc afd afe aff afm ama amc amd ame amf amm c-- caa cac cad cae caf cam cca ccc ccd cce ccf ccm cda cdc cdd cde cdf cdm ce- cea cec ced cee cef cem cfa cfc cfd cfe cff cfm cma cmc cmd cme cmf cmm daa dac dad dae daf dam dca dcc dcd dce dcf dcm dda ddc ddd dde ddf ddm de- dea dec ded dee def dem dfa dfc dfd dfe dff dfm dma dmc dmd dme dmf dmm eaa eac ead eae eaf eam ec- eca ecc ecd ece ecf ecm ed- eda edc edd ede edf edm eea eec eed eee eef eem ef- efa efc efd efe eff efm em- ema emc emd eme emf emm faa fac fad fae faf fam fca fcc fcd fce fcf fcm fda fdc fdd fde fdf fdm fea fec fed fee fef fem ffa ffc ffd ffe fff ffm fma fmc fmd fme fmf fmm m-f maa mac mad mae maf mam mc- mca mcc mcd mce mcf mcm mda mdc mdd mde mdf mdm mea mec med mee mef mem mfa mfc mfd mfe mff mfm mma mmc mmd mme mmf mmm