[
  {
    "id": "F01",
    "comment": "=1+2"
  },
  {
    "id": "F02",
    "comment": "ordinary text"
  },
  {
    "id": "F03",
    "comment": "+123"
  },
  {
    "id": "F04",
    "comment": "@sample"
  }
]