{
  "children": [
    {
      "children": [{
        "id": "b",
        "type": "In"
      }],
      "id": "a",
      "type": "Ambient"
    },
    {
      "children": [{
        "id": "a",
        "type": "In_"
      }],
      "id": "b",
      "type": "Ambient"
    }
  ],
  "type": "Parallel"
}