a-a a-c aaa aac aae aaf aag ac- aca acc ace acf acg aea aec aee aef aeg af- afa afc afe aff afg ag- aga agc age agf agg c-- caa cac cae caf cag cca ccc cce ccf ccg ce- cea cec cee cef ceg cfa cfc cfe cff cfg cga cgc cge cgg eaa eac eae eaf eag ec- eca ecc ece ecf ecg eea eec eee eef eeg ef- efa efc efe eff efg ega egc ege egf egg faa fac fae faf fag fca fcc fce fcf fcg fea fec fee fef feg ffa ffc ffe fff ffg fga fgc fge fgf fgg gaa gac gae gaf gag gca gcc gce gcf gcg ge- gea gec gee gef geg gfa gfc gfe gff gga ggc ggg