a-a a-c a-t aaa aac aan aao aat aax aay ac- aca acc acn aco act acx acy an- ana anc ann ano ant anx any aoa aoc aon aoo aot aox at- ata atc atn ato att atx ax- axa axn axo axt axx ay- aya ayc ayn ayo ayt ayx c-- caa cac can cao cat cax cay cca ccc ccn cco cct ccx cn- cna cnc cnn cno cnt cnx cny co- coa coc con coo cot cox coy cta ctc ctn cto ctt ctx cty cxc cxo cxt cxx cya cyc cyn cyo cyt naa nac nan nao nat nax nay nca ncc ncn nco nct ncx nna nnc nnn nno nnt no- noa noc non noo not nox noy nta ntc ntn nto ntt ntx nxc nxt nya nyc nyn nyo nyt nyx nyy oaa oac oan oao oat oax oc- oca occ ocn oco oct ocx on- ona onc onn ono ont onx ony oo- ooa ooc oon ooo oot oox ot- ota otc otn oto ott ox- oxa oxc oxn oxo oxt oxx oxy oya oyo t-x taa tac tan tao tat tax tay tca tcc tcn tco tct tcx tna tnc tnn tno tnt tnx to- toa toc ton too tot tox toy tta ttc ttn tto ttt ttx tty txn txt tya tyc tyn tyo tyt xaa xac xan xat xcx xna xnc xno xoa xoc xon xoo xot xox xtc xtx xty xxo xxx xxy xyy yaa yac yan yao yat yax yay yca ycc yco ycy yna ynn yny yoc yon yoo yot yox yoy yta ytc ytn yto ytt yxa yxy yyc yyt yyy