{
  "type": "minecraft:random_selector",
  "config": {
    "default": "minecraft:oak_checked",
    "features": [
      {
        "chance": 0.8,
        "feature": "minecraft:acacia_checked"
      },
      {
        "chance": 0.0125,
        "feature": "minecraft:fallen_oak_tree"
      }
    ]
  }
}