[
  {
    "end_time": "Tue, 28 Jun 2016 23:01:33 GMT",
    "end_time_unix_timestamp": 1467154893,
    "grade": "D-",
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  {
    "end_time": "Mon, 22 Apr 2019 14:47:24 GMT",
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    "grade": "C-",
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]