a-a a-c a-t aaa aac aad aae aaf aas aat ac- aca acc acd ace acf acs act ad- ada adc add ade adf ads adt aea aec aed aee aef aes aet af- afa afc afd afe aff afs aft as- asa asc asd ase asf ass ast at- ata atc atd ate atf ats att c-- caa cac cad cae caf cas cat cca ccc ccd cce ccf ccs cct cda cdc cdd cde cdf cds cdt ce- cea cec ced cee cef ces cet cfa cfc cfd cfe cff cfs cft csa csc csd cse csf css cst cta ctc ctd cte ctf cts ctt daa dac dad dae daf das dat dca dcc dcd dce dcf dcs dct dda ddc ddd dde ddf dds ddt de- dea dec ded dee def des det dfa dfc dfd dfe dff dfs dft dsa dsc dsd dse dsf dss dst dta dtc dtd dte dtf dts dtt eaa eac ead eae eaf eas eat ec- eca ecc ecd ece ecf ecs ect ed- eda edc edd ede edf eds edt eea eec eed eee eef ees eet ef- efa efc efd efe eff efs eft es- esa esc esd ese esf ess est eta etc etd ete etf ets ett faa fac fad fae faf fas fat fca fcc fcd fce fcf fcs fct fda fdc fdd fde fdf fds fdt fea fec fed fee fef fes fet ffa ffc ffd ffe fff ffs fft fsa fsc fsd fse fsf fss fst fta ftc ftd fte ftf fts ftt saa sac sad sae saf sas sat sca scc scd sce scf scs sct sda sdc sdd sde sdf sds sdt se- sea sec sed see sef ses set sfa sfc sfd sfe sff sfs sft ss- ssa ssc ssd sse ssf sss sst sta stc std ste stf sts stt taa tac tad tae taf tas tat tca tcc tcd tce tcf tcs tct tda tdc tdd tde tdf tds tdt te- tea tec ted tee tef tes tet tfa tfc tfd tfe tff tfs tft tsa tsc tsd tse tsf tss tst tta ttc ttd tte ttf tts ttt