a-a a-c a-t aaa aac aad aae aas aat ac- aca acc acd ace acs act ad- ada adc add ade ads adt aea aec aed aee aes aet as- asa asc asd ase ass ast at- ata atc atd ate ats att c-- caa cac cad cae cas cat cca ccc ccd cce ccs cct cda cdc cdd cde cds cdt ce- cea cec ced cee ces cet csa csc csd cse css cst cta ctc ctd cte cts ctt daa dac dad dae das dat dca dcc dcd dce dcs dct dda ddc ddd dde dds ddt de- dea dec ded dee des det dsa dsc dsd dse dss dst dta dtc dtd dte dts dtt eaa eac ead eae eas eat ec- eca ecc ecd ece ecs ect ed- eda edc edd ede eds edt eea eec eed eee ees eet es- esa esc esd ese ess est eta etc etd ete ets ett saa sac sad sae sas sat sca scc scd sce scs sct sda sdc sdd sde sds sdt se- sea sec sed see ses set ss- ssa ssc ssd sse sss sst sta stc std ste sts stt taa tac tad tae tas tat tca tcc tcd tce tcs tct tda tdc tdd tde tds tdt te- tea tec ted tee tes tet tsa tsc tsd tse tss tst tta ttc ttd tte tts ttt