{
  "leader": "",
  "fields":
  [
    {"tag": "650", "ind1": " ", "ind2": " ", "subfields": [{"code": "y", "value": "A"}] },
    {"tag": "650", "ind1": " ", "ind2": " ", "subfields": [{"code": "y", "value": "B"}] },
    {"tag": "650", "ind1": " ", "ind2": " ", "subfields": [{"code": "y", "value": "C"}] },
    {"tag": "650", "ind1": " ", "ind2": " ", "subfields": [{"code": "y", "value": "D"}] }
  ]
}