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Records: 2  Duplicates: 0  Warnings: 0
id jdoc
1 {
  "groups": {
    "CS": 15,
    "History": 10,
    "Physics": 20
  }
}
2 {
  "groups": {
    "CS": 6,
    "Physics": 8,
    "Chemistry": 5
  }
}
id Chemistry CS History Physics
1 null 15 10 20
2 5 6 null 8