{
  "feature": "tutorial:ore_nether_custom",
  "placement": [
    {
      "type": "minecraft:count",
      "count": 20
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:height_range",
      "height": {
        "type": "minecraft:uniform",
        "max_inclusive": {
          "below_top": 10
        },
        "min_inclusive": {
          "above_bottom": 10
        }
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}