---
    admin_level: 
        "2": "country"
        "4": "state"
        "5": "state_district"
        "6": "state_district"
        "8": "city"
        "10": "suburb"
    designation: 
        non_metropolitan_county: "state_district"
        non_metropolitan_district: "state_district"
        unitary_authority: "state_district"
        civil_parish: "city"
    overrides:
        id:
            relation:
                # London
                "65606": "city"
                # City of London
                "51800": "city"

        contained_by:
            relation:
                # Greater London (includes London and City of London)
                "175342":
                    admin_level:
                        "6": "city"
                        "8": "city_district"