{
  "entities": {
    "minecraft:zombie": {
      "[0, 100]": [
        {
          "chance": 0.5,
          "item": "minecraft:cobblestone"
        }
      ],
      "[50, 150]": [
        {
          "chance": 0.25,
          "item": "minecraft:stone"
        }
      ]
    }
  }
}