a-a a-c a-t aaa aac aae aaf aat ac- aca acc ace acf act aea aec aee aef aet af- afa afc afe aff aft at- ata atc ate atf att c-- caa cac cae caf cat cca ccc cce ccf cct ce- cea cec cee cef cet cfa cfc cfe cff cft cta ctc cte ctf ctt eaa eac eae eaf eat ec- eca ecc ece ecf ect eea eec eee eef eet ef- efa efc efe eff eft eta etc ete etf ett faa fac fae faf fat fca fcc fce fcf fct fea fec fee fef fet ffa ffc ffe fff fft fta ftc fte ftf ftt taa tac tae taf tat tca tcc tce tcf tct te- tea tec tee tef tet tfa tfc tfe tff tft tta ttc tte ttf ttt