a-a a-c a-t aaa aac aak aao aat ac- aca acc ack aco act aka akc akk ako aoa aoc aok aoo aot at- ata atc ato att c-- caa cac cak cao cat cca ccc cck cco cct cka ckc cko ckt co- coa coc cok coo cot cta ctc ctk cto ctt k-t ka- kaa kac kak kao kat kca kcc kck kct kkc kkk kkt koa koc kok koo kot kta ktc ktk kto ktt oaa oac oak oao oat oc- oca occ ock oco oct oka okc okk oko oo- ooa ooc ook ooo oot ot- ota otc otk oto ott taa tac tak tao tat tca tcc tck tco tct tka tkc tkk tko tkt to- toa toc tok too tot tta ttc ttk tto ttt