a-a a-c a-t aaa aac aan aao aat aax ac- aca acc acn aco act acx an- ana anc ann ano ant anx aoa aoc aon aoo aot aox at- ata atc atn ato att atx ax- axa axn axo axt axx c-- caa cac can cao cat cax cca ccc ccn cco cct ccx cn- cna cnc cnn cno cnt cnx co- coa coc con coo cot cox cta ctc ctn cto ctt ctx cxc cxo cxt cxx naa nac nan nao nat nax nca ncc ncn nco nct ncx nna nnc nnn nno nnt no- noa noc non noo not nox nta ntc ntn nto ntt ntx nxc nxt oaa oac oan oao oat oax oc- oca occ ocn oco oct ocx on- ona onc onn ono ont onx oo- ooa ooc oon ooo oot oox ot- ota otc otn oto ott ox- oxa oxc oxn oxo oxt oxx t-x taa tac tan tao tat tax tca tcc tcn tco tct tcx tna tnc tnn tno tnt tnx to- toa toc ton too tot tox tta ttc ttn tto ttt ttx txn txt xaa xac xan xat xcx xna xnc xno xoa xoc xon xoo xot xox xtc xtx xxo xxx