{
  "1": {
    "2018-04-01": 1,
    "2016-10-01": 1
  },
  "2": {
    "2018-04-01": 1,
    "2016-10-01": 1,
    "2018-11-01": 1
  },
  "3": {
    "2021-03-31": 1,
    "2019-03-30": 1
  },
  "4": {
    "2020-07-31": 1
  }
}