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#!/usr/bin/perl

...
500000008    Network1    2021-03-11T17:12:42.000Z
500000008    Network3    Not Used
400000008    Network1    2021-01-25T17:19:36.000Z

{
  400000008 => { Network1 => ["2021-01-25T17:19:36.000Z"] },
...
                 ],
               },
}