[
  {
    "id": "shelves_zoo",
    "type": "item_group",
    "subtype": "distribution",
    "entries": [
      { "group": "SUS_janitors_closet", "prob": 15 },
      { "group": "gift_shop", "prob": 25 },
      { "group": "tools_general", "prob": 10 }
    ]
  }
]
