{
  "type": "minecraft:simple_random_selector",
  "config": {
    "features": [
      {
        "feature": {
          "type": "minecraft:block_column",
          "config": {
            "direction": "north",
            "allowed_placement": {
              "type": "minecraft:all_of",
              "predicates": [
                {
                  "type": "minecraft:replaceable"
                },
                {
                  "type": "minecraft:matching_blocks",
                  "offset": [
                    0,
                    -1,
                    0
                  ],
                  "blocks": [
                    "minecraft:grass_block",
                    "minecraft:stone",
                    "minecraft:gravel"
                  ]
                }
              ]
            },
            "prioritize_tip": true,
            "layers": [
              {
                "height": {
                  "type": "minecraft:uniform",
                  "value": {
                    "min_inclusive": 3,
                    "max_inclusive": 5
                  }
                },
                "provider": {
                  "type": "minecraft:simple_state_provider",
                  "state": {
                    "Name": "minecraft:birch_log",
                    "Properties": {
                      "axis": "z"
                    }
                  }
                }
              }
            ]
          }
        },
        "placement": [
          {
            "type": "minecraft:block_predicate_filter",
            "predicate": {
              "type": "minecraft:matching_blocks",
              "offset": [
                0,
                -1,
                0
              ],
              "blocks": [
                "minecraft:grass_block"
              ]
            }
          }
        ]
      },
      {
        "feature": {
          "type": "minecraft:block_column",
          "config": {
            "direction": "west",
            "allowed_placement": {
              "type": "minecraft:all_of",
              "predicates": [
                {
                  "type": "minecraft:replaceable"
                },
                {
                  "type": "minecraft:matching_blocks",
                  "offset": [
                    0,
                    -1,
                    0
                  ],
                  "blocks": [
                    "minecraft:grass_block"
                  ]
                }
              ]
            },
            "prioritize_tip": true,
            "layers": [
              {
                "height": {
                  "type": "minecraft:uniform",
                  "value": {
                    "min_inclusive": 3,
                    "max_inclusive": 5
                  }
                },
                "provider": {
                  "type": "minecraft:simple_state_provider",
                  "state": {
                    "Name": "minecraft:birch_log",
                    "Properties": {
                      "axis": "x"
                    }
                  }
                }
              }
            ]
          }
        },
        "placement": [
          {
            "type": "minecraft:block_predicate_filter",
            "predicate": {
              "type": "minecraft:matching_blocks",
              "offset": [
                0,
                -1,
                0
              ],
              "blocks": [
                "minecraft:grass_block",
                "minecraft:stone",
                "minecraft:gravel"
              ]
            }
          }
        ]
      }
    ]
  }
}