{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "array",
    "items": [
        {"type": "string"},
        {"type": "number"}
    ],
    "additionalItems": {
        "anyOf": [
            {"type": "string"},
            {"type": "number"}
        ]
    },
    "minItems": 2
}