{
    "name": "Dummy",
    "description": "Empty lesson for testing.",
    "medals": {
      "bronze": { "wpm": 0, "accuracy": 60 },
      "silver": { "wpm": 0, "accuracy": 60 },
      "gold":   { "wpm": 0, "accuracy": 90 }
    },
    "steps": [
      {
        "type": "key",
        "instructions": "Type an x.",
        "text": "x"
      }
    ]
  }