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name JSON_PRETTY(attributes)
Jack {
  "el": [
    "insrted",
    1
  ],
  "profile": "M"
}
John {
  "el": [
    "dup_upd",
    4
  ],
  "profile": "M"
}
Sarah {
  "el": [
    "dup_upd",
    3
  ],
  "profile": "F"
}