public String genotypeToStringForHumans() {
   StringBuilder s = new StringBuilder();
   for (int i = 0; i < genome.length; i++) {
     if (genome[i]) s.append("1");
     else s.append("0");
   }
   return s.toString();
 }
 public String genotypeToString() {
   StringBuilder s = new StringBuilder();
   s.append(Code.encode(genome.length));
   for (int i = 0; i < genome.length; i++) s.append(Code.encode(genome[i]));
   return s.toString();
 }