{
    "contact_points": [
        {
            "id": 0,
            "description": "On the handle of the knife",
            "usage": "Used for grasping the knife."
        }
    ],
    "functional_points": [
        {
            "id": 0,
            "description": "At the blade of the knife",
            "usage": "Used to indicate where the knife will make contact with other objects."
        }
    ]
}