a-a a-c aaa aac aae aak aam ac- aca acc ace ack acm aea aec aee aek aem aka akc ake akk akm ama amc ame amk amm c-- caa cac cae cak cam cca ccc cce cck ccm ce- cea cec cee cek cem cka ckc ckm cma cmc cme cmk cmm eaa eac eae eak eam ec- eca ecc ece eck ecm eea eec eee eek eem eka ekc eke em- ema emc eme emk emm ka- kaa kac kae kak kam kca kcc kce kck kcm ke- kea kec kee kek kem kkc kke kkk kkm kma kmc kme kmk kmm maa mac mae mak mam mc- mca mcc mce mck mcm mea mec mee mek mem mka mkc mke mkk mkm mma mmc mme mmk mmm