{
    "curriculum": {
        "depth": "core",
        "plural": "curricula",
        "has": ["topic", "topics"],
        "in": false
    },
    "topic": {
        "depth": "mantle",
        "plural": "topics",
        "has": ["lesson", "lessons"],
        "in": ["curriculum", "curricula"]
    },
    "lesson": {
        "depth": "crust",
        "plural": "lessons",
        "has": false,
        "in": ["topic", "topics"]
    }
}