{
  "rows": [
    {
      "id": "r1",
      "amount": 4
    },
    {
      "id": "r2",
      "amount": 6
    },
    {
      "id": "r3",
      "amount": "?"
    },
    {
      "id": "r4",
      "amount": 0
    }
  ]
}