anchor.diff:    var breeds = new List.from(content.breeds.values);
     breeds.sort((a, b) => a.experienceCents.compareTo(b.experienceCents));
   
  +  // Generate a bunch of drops.
  +  var tries = 0;
  +  var drops = {};
  +
  +  var save = new HeroSave({}, "Hero");
  +  var game = new Game(content.areas[0], 0, content, save);
  +
  +  for (var breed in breeds) {
  +    drops[breed.name] = {};
  +  }
  +
  +  for (var i = 0; i < 10000; i++) {
  +    tries++;
  +
  +    for (Breed breed in breeds) {
  +      breed.drop.spawnDrop(game, (item) {
  +        drops[breed.name].putIfAbsent(item.type.name, () => 0);
  +        drops[breed.name][item.type.name]++;
  +      });
  +    }
  +  }
  +
     text.write('''
       <thead>
       <tr>
  
positive.code:       <td>Exp.</td>
        <td>Attacks</td>
        <td>Flags</td>
      </tr>
      </thead>
      <tbody>
  
negative.code:       text.write('$flag ');
      }
  
      text.write('</td><td>');
  
      var drop = drops[breed.name];
      var items = drop.keys.toList();
      items.sort((a, b) => drop[b].compareTo(drop[a]));
  
      text.write(items.map((item) {
        return "${(drop[item] / tries * 100).toStringAsFixed(3)}% $item";
      }).join("<br>"));
  
      text.write('</td></tr>');
    }
    text.write('</tbody>');
  