{
  "name": "acid_dissolves_wood",
  "description": "Acid should dissolve wood but not stone",
  "seed": 42,
  "init_mode": "empty",
  "setup": [
    {"type": "fill_rect", "x": 100, "y": 115, "w": 20, "h": 3, "material": "stone"},
    {"type": "fill_rect", "x": 103, "y": 112, "w": 5, "h": 1, "material": "stone"},
    {"type": "set_cell", "x": 105, "y": 111, "material": "wood"},
    {"type": "set_cell", "x": 104, "y": 111, "material": "acid"},
    {"type": "set_cell", "x": 106, "y": 111, "material": "acid"},
    {"type": "set_cell", "x": 105, "y": 110, "material": "acid"}
  ],
  "steps": 30,
  "assertions": [
    {"type": "no_material_in_region", "x": 103, "y": 109, "w": 5, "h": 4, "material": "wood"}
  ]
}