uccser/cs-field-guide

{
    "chart": {
        "container": "#tree-diagram",
        "connectors": {
            "type": "straight",
            "style": {
                "arrow-end": "block-wide-long",
                "stroke-width": 2
            }
        }
    },
    "nodeStructure": {
        "text": { "name": "S" },
        "children": [
            {
                "text": { "name": "S" },
                "children": [
                    {
                        "pseudo": true,
                        "children": [
                            {
                                "text": { "name": "a" }
                            }
                        ]
                    },
                    {
                        "pseudo": true,
                        "children": [
                            {
                                "text": { "name": "b" }
                            }
                        ]
                    }
                ]
            },
            {
                "text": { "name": "S" },
                "children": [
                    {
                        "pseudo": true,
                        "children": [
                            {
                                "text": { "name": "a" }
                            }
                        ]
                    },
                    {
                        "text": { "name": "S" },
                        "children": [
                            {
                                "text": { "name": "a" }
                            },
                            {
                                "text": { "name": "b" }
                            }
                        ]
                    },
                    {
                        "pseudo": true,
                        "children": [
                            {
                                "text": { "name": "b" }
                            }
                        ]
                    }
                ]
            }
        ]
    }
}