a-a a-c a-t aaa aac aad aan aao aat aax ac- aca acc acd acn aco act acx ad- ada adc add adn ado adt adx an- ana anc and ann ano ant anx aoa aoc aod aon aoo aot aox at- ata atc atd atn ato att atx ax- axa axn axo axt axx c-- caa cac cad can cao cat cax cca ccc ccd ccn cco cct ccx cda cdc cdd cdn cdo cdt cdx cn- cna cnc cnd cnn cno cnt cnx co- coa coc cod con coo cot cox cta ctc ctd ctn cto ctt ctx cxc cxo cxt cxx daa dac dad dan dao dat dax dca dcc dcd dcn dco dct dcx dda ddc ddd ddn ddo ddt ddx dna dnc dnd dnn dno dnt doa doc dod don doo dot dox dta dtc dtd dtn dto dtt dtx dxc dxd dxn dxo dxt dxx naa nac nad nan nao nat nax nca ncc ncd ncn nco nct ncx nda ndc ndd ndn ndo ndt nna nnc nnn nno nnt no- noa noc nod non noo not nox nta ntc ntd ntn nto ntt ntx nxc nxd nxt oaa oac oad oan oao oat oax oc- oca occ ocd ocn oco oct ocx oda odc odd odn odo odt on- ona onc ond onn ono ont onx oo- ooa ooc ood oon ooo oot oox ot- ota otc otd otn oto ott ox- oxa oxc oxn oxo oxt oxx t-x taa tac tad tan tao tat tax tca tcc tcd tcn tco tct tcx tda tdc tdd tdn tdo tdt tdx tna tnc tnd tnn tno tnt tnx to- toa toc tod ton too tot tox tta ttc ttd ttn tto ttt ttx txn txt xaa xac xad xan xat xcd xcx xda xdc xdt xna xnc xno xoa xoc xod xon xoo xot xox xtc xtx xxo xxx