a-a a-c aaa aac aae aaf aak aam ac- aca acc ace acf ack acm aea aec aee aef aek aem af- afa afc afe aff afk afm aka akc ake akk akm ama amc ame amf amk amm c-- caa cac cae caf cak cam cca ccc cce ccf cck ccm ce- cea cec cee cef cek cem cfa cfc cfe cff cfk cfm cka ckc ckm cma cmc cme cmf cmk cmm eaa eac eae eaf eak eam ec- eca ecc ece ecf eck ecm eea eec eee eef eek eem ef- efa efc efe eff efm eka ekc eke ekf em- ema emc eme emf emk emm faa fac fae faf fak fam fca fcc fce fcf fck fcm fea fec fee fef fek fem ffa ffc ffe fff ffk ffm fka fkc fkf fkk fkm fma fmc fme fmf fmm ka- kaa kac kae kaf kak kam kca kcc kce kck kcm ke- kea kec kee kef kek kem kfa kfc kff kfm kkc kke kkk kkm kma kmc kme kmf kmk kmm m-f maa mac mae maf mak mam mc- mca mcc mce mcf mck mcm mea mec mee mef mek mem mfa mfc mfe mff mfm mka mkc mke mkk mkm mma mmc mme mmf mmk mmm