{
  "version": 8,
  "name": "Grouped layers",
  "sources": {},
  "layers": [
    { "id": "background", "type": "background" },
    { "id": "park-a", "type": "background" },
    { "id": "park-b", "type": "background" },
    { "id": "park-c", "type": "background" },
    { "id": "road", "type": "background" },
    { "id": "park-d", "type": "background" },
    { "id": "park-e", "type": "background" },
    { "id": "water-a", "type": "background" },
    { "id": "water-b", "type": "background" }
  ]
}