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   my %hash = tie( ('a' => 1), 'IxHash' );

   my %big_hash = (
       'part_1' => tie( %{...}, 'MyTie'),
       'part_2' => tie( %{...}, 'MyTie'),
       ...
   );

   tie my %part_1, 'IxHash';
   # set values for %part_1
...
      'part_2' => \%part_2,
      ...
   );