{
    "type": "minecraft:jigsaw",
    "biomes": "#zhopo:has_structure/portal_nether",
    "step": "surface_structures",
    "spawn_overrides": {},
    "terrain_adaptation": "beard_box", 
    "start_pool": "hopo:portal_nether",
    "size": 2,  
    "start_height": {
      "type": "minecraft:uniform",
      "min_inclusive": {
        "absolute": 40
      },
      "max_inclusive": {
        "absolute": 65
      }
    },
  "max_distance_from_center": 100,
  "use_expansion_hack": false
}