# Add ambiguity codes to codons.

BEGIN {
  base["."] = 0;
  base["a"] = 1;
  base["c"] = 2;
  base["g"] = 4;
  base["u"] = 8;
  base["m"] = base["a"] + base["c"];
  base["r"] = base["a"] + base["g"];
  base["w"] = base["a"] + base["u"];
  base["s"] = base["c"] + base["g"];
  base["y"] = base["c"] + base["u"];
  base["k"] = base["g"] + base["u"];
  base["v"] = base["a"] + base["c"] + base["g"];
  base["h"] = base["a"] + base["c"] + base["u"];
  base["w"] = base["a"] + base["g"] + base["u"];
  base["b"] = base["c"] + base["g"] + base["u"];
  base["n"] = base["a"] + base["c"] + base["g"] + base["u"];
}

{
  aa = $2;
  codon = $1;
}

END {
  print base["m"];
}