a-a a-c a-t aaa aac aad aae aao aas aat aax ac- aca acc acd ace aco acs act acx ad- ada adc add ade ado ads adt adx aea aec aed aee aeo aes aet aex aoa aoc aod aoe aoo aos aot aox as- asa asc asd ase aso ass ast asx at- ata atc atd ate ato ats att atx ax- axa axe axo axs axt axx c-- caa cac cad cae cao cas cat cax cca ccc ccd cce cco ccs cct ccx cda cdc cdd cde cdo cds cdt cdx ce- cea cec ced cee ceo ces cet cex co- coa coc cod coe coo cos cot cox csa csc csd cse cso css cst csx cta ctc ctd cte cto cts ctt ctx cxc cxo cxs cxt cxx daa dac dad dae dao das dat dax dca dcc dcd dce dco dcs dct dcx dda ddc ddd dde ddo dds ddt ddx de- dea dec ded dee deo des det dex doa doc dod doe doo dos dot dox dsa dsc dsd dse dso dss dst dsx dta dtc dtd dte dto dts dtt dtx dxc dxd dxo dxs dxt dxx eaa eac ead eae eao eas eat eax ec- eca ecc ecd ece eco ecs ect ecx ed- eda edc edd ede edo eds edt edx eea eec eed eee eeo ees eet eex eo- eoa eoc eod eoe eoo eos eot es- esa esc esd ese eso ess est esx eta etc etd ete eto ets ett etx ex- exa exc exd exe exo exs ext exx oaa oac oad oae oao oas oat oax oc- oca occ ocd oco ocs oct ocx oda odc odd ode odo ods odt oea oec oed oee oeo oes oet oex oo- ooa ooc ood ooo oos oot oox os- osa osc osd ose oso oss ost osx ot- ota otc otd ote oto ots ott ox- oxa oxc oxo oxt oxx saa sac sad sae sao sas sat sax sca scc scd sce sco scs sct scx sda sdc sdd sde sdo sds sdt se- sea sec sed see seo ses set sex soa soc sod soe soo sos sot sox ss- ssa ssc ssd sse sso sss sst ssx sta stc std ste sto sts stt stx sxc sxs sxt t-x taa tac tad tae tao tas tat tax tca tcc tcd tce tco tcs tct tcx tda tdc tdd tde tdo tds tdt tdx te- tea tec ted tee teo tes tet tex to- toa toc tod toe too tos tot tox tsa tsc tsd tse tso tss tst tsx tta ttc ttd tte tto tts ttt ttx txe txs txt xaa xac xad xas xat xcd xcx xda xdc xde xds xdt xed xee xes xet xex xoa xoc xod xoo xos xot xox xsa xsc xss xst xtc xts xtx xxo xxx