a-a a-c a-t aaa aac aae aak aao aat ac- aca acc ace ack aco act aea aec aee aek aeo aet aka akc ake akk ako aoa aoc aoe aok aoo aot at- ata atc ate ato att c-- caa cac cae cak cao cat cca ccc cce cck cco cct ce- cea cec cee cek ceo cet cka ckc cko ckt co- coa coc coe cok coo cot cta ctc cte ctk cto ctt eaa eac eae eak eao eat ec- eca ecc ece eck eco ect eea eec eee eek eeo eet eka ekc eke eko ekt eo- eoa eoc eoe eok eoo eot eta etc ete etk eto ett k-t ka- kaa kac kae kak kao kat kca kcc kce kck kct ke- kea kec kee kek keo ket kkc kke kkk kkt koa koc koe kok koo kot kta ktc kte ktk kto ktt oaa oac oae oak oao oat oc- oca occ ock oco oct oea oec oee oeo oet oka okc oke okk oko oo- ooa ooc ook ooo oot ot- ota otc ote otk oto ott taa tac tae tak tao tat tca tcc tce tck tco tct te- tea tec tee tek teo tet tka tkc tke tkk tko tkt to- toa toc toe tok too tot tta ttc tte ttk tto ttt