[
  {
    "id": "mansion_books",
    "type": "item_group",
    "//": "Those rich mansion people have all sorts of weird books.",
    "subtype": "distribution",
    "entries": [
      { "item": "manual_barbaran", "prob": 10 }
    ]
  },
  {
    "id": "exotic_books",
    "type": "item_group",
    "//": "These are books that are hard to find or esoteric, mostly.",
    "subtype": "distribution",
    "entries": [
      { "item": "manual_barbaran", "prob": 1 }
    ]
  }
]