{
    "nodes": [
        { "id": "Myriel",     "group": 1 },
        { "id": "Napoleon",   "group": 1 },
        { "id": "Labarre",    "group": 2 },
        { "id": "Valjean",    "group": 2 },
        { "id": "Marguerite", "group": 3 },
        { "id": "Tholomyes",  "group": 3 }
    ],
    "links": [
        { "source": "Napoleon",   "target": "Myriel",    "value": 1 },
        { "source": "Valjean",    "target": "Myriel",    "value": 1 },
        { "source": "Myriel",     "target": "Labarre",   "value": 2 },
        { "source": "Tholomyes",  "target": "Labarre",   "value": 2 },
        { "source": "Marguerite", "target": "Valjean",   "value": 3 },
        { "source": "Marguerite", "target": "Tholomyes", "value": 3 }
    ]
}