a-a a-c a-t aaa aac aae aaf aas aat ac- aca acc ace acf acs act aea aec aee aef aes aet af- afa afc afe aff afs aft as- asa asc ase asf ass ast at- ata atc ate atf ats att c-- caa cac cae caf cas cat cca ccc cce ccf ccs cct ce- cea cec cee cef ces cet cfa cfc cfe cff cfs cft csa csc cse csf css cst cta ctc cte ctf cts ctt eaa eac eae eaf eas eat ec- eca ecc ece ecf ecs ect eea eec eee eef ees eet ef- efa efc efe eff efs eft es- esa esc ese esf ess est eta etc ete etf ets ett faa fac fae faf fas fat fca fcc fce fcf fcs fct fea fec fee fef fes fet ffa ffc ffe fff ffs fft fsa fsc fse fsf fss fst fta ftc fte ftf fts ftt saa sac sae saf sas sat sca scc sce scf scs sct se- sea sec see sef ses set sfa sfc sfe sff sfs sft ss- ssa ssc sse ssf sss sst sta stc ste stf sts stt taa tac tae taf tas tat tca tcc tce tcf tcs tct te- tea tec tee tef tes tet tfa tfc tfe tff tfs tft tsa tsc tse tsf tss tst tta ttc tte ttf tts ttt