{
  "type": "minecraft:sequence",
  "sequence": [
    {
      "type": "minecraft:condition",
      "if_true": "minecraft:not_underwater",
      "then_run": {
        "type": "minecraft:block",
        "result_state": "minecraft:grass_block"
      }
    },
    {
      "type": "minecraft:block",
      "result_state": "minecraft:dirt"
    }
  ]
}