{
  "variants": {
    "": [
      { "model": "block/birch_planks" },
      { "model": "block/birch_planks_01" },
      { "model": "block/birch_planks_02" },
      { "model": "block/birch_planks_03" },
      { "model": "block/birch_planks_04" },
      { "model": "block/birch_planks_05" }
    ]
  }
}