a-a a-c aaa aac aaf aag aah ac- aca acc acf acg ach af- afa afc aff afg afh ag- aga agc agf agg agh aha ahc ahf ahg ahh c-- caa cac caf cag cah cca ccc ccf ccg cch cfa cfc cff cfg cfh cga cgc cgg cgh ch- cha chc chf chg chh faa fac faf fag fah fca fcc fcf fcg ffa ffc fff ffg ffh fga fgc fgf fgg fgh fha fhc fhf fhg fhh gaa gac gaf gag gah gca gcc gcf gcg gch gfa gfc gff gfh gga ggc ggg ggh gha ghc ghg ghh haa hac haf hag hah hca hcc hcf hcg hch hfa hfc hff hfg hfh hga hgc hgf hgg hgh hha hhc hhf hhg hhh