{
  "feature": "twilightforest:dense_ferns",
  "placement": [
    {
      "type": "minecraft:count",
      "count": {
        "type": "minecraft:weighted_list",
        "distribution": [
          {
            "data": 3,
            "weight": 1
          },
          {
            "data": 4,
            "weight": 1
          }
        ]
      }
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "WORLD_SURFACE_WG"
    },
    {
      "type": "minecraft:biome"
    }
  ]
}