a-a a-c aaa aac aae aak aav ac- aca acc ace ack acv aea aec aee aek aev aka akc ake akk akv av- ava avc ave avk c-- caa cac cae cak cav cca ccc cce cck ccv ce- cea cec cee cek cev cka ckc cva cvc cve cvk cvv eaa eac eae eak eav ec- eca ecc ece eck ecv eea eec eee eek eev eka ekc eke ekv eva evc eve evv ka- kaa kac kae kak kav kca kcc kce kck ke- kea kec kee kek kev kkc kke kkk kkv kva kvk kvv v-a v-e vaa vac vae vak vav vca vcc vce vea vec vee vek vka vva vvc vvv