a-a a-c aaa aac aae aak aao ac- aca acc ace ack aco aea aec aee aek aeo aka akc ake akk ako aoa aoc aoe aok aoo c-- caa cac cae cak cao cca ccc cce cck cco ce- cea cec cee cek ceo cka ckc cko co- coa coc coe cok coo eaa eac eae eak eao ec- eca ecc ece eck eco eea eec eee eek eeo eka ekc eke eko eo- eoa eoc eoe eok eoo ka- kaa kac kae kak kao kca kcc kce kck ke- kea kec kee kek keo kkc kke kkk koa koc koe kok koo oaa oac oae oak oao oc- oca occ ock oco oea oec oee oeo oka okc oke okk oko oo- ooa ooc ook ooo