a-a a-c a-t aaa aac aak aan aao aat ac- aca acc ack acn aco act aka akc akk akn ako an- ana anc ank ann ano ant aoa aoc aok aon aoo aot at- ata atc atn ato att c-- caa cac cak can cao cat cca ccc cck ccn cco cct cka ckc cko ckt cn- cna cnc cnn cno cnt co- coa coc cok con coo cot cta ctc ctk ctn cto ctt k-t ka- kaa kac kak kan kao kat kca kcc kck kcn kct kkc kkk kkn kkt kn- kna knc knk knn kno knt koa koc kok kon koo kot kta ktc ktk ktn kto ktt naa nac nak nan nao nat nca ncc nck ncn nco nct nka nkc nkk nkn nko nkt nna nnc nnk nnn nno nnt no- noa noc nok non noo not nta ntc ntk ntn nto ntt oaa oac oak oan oao oat oc- oca occ ock ocn oco oct oka okc okk oko on- ona onc onk onn ono ont oo- ooa ooc ook oon ooo oot ot- ota otc otk otn oto ott taa tac tak tan tao tat tca tcc tck tcn tco tct tka tkc tkk tko tkt tna tnc tnk tnn tno tnt to- toa toc tok ton too tot tta ttc ttk ttn tto ttt