{
  "variants":
  {
    "type=bottom":
    [
      { "model": "block/birch_slab", "weight": 2 },
      { "model": "block/birch_slab_alt_1" },
      { "model": "block/birch_slab_alt_2" }
    ],
    "type=top":
    [
      { "model": "block/birch_slab_top", "weight": 2 },
      { "model": "block/birch_slab_top_alt_1" },
      { "model": "block/birch_slab_top_alt_2" }
    ],
    "type=double":
    [
      { "model": "block/birch_planks", "weight": 2 },
      { "model": "block/birch_planks_alt_1" },
      { "model": "block/birch_planks_alt_2" }
    ]
  }
}
