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  1. or download this
    use constant A => $hash;
  2. or download this
    my $hash = { 'a' => 2 };
  3. or download this
    my $hash;
BEGIN { $hash = { 'a' => 2 } }
use constant A => $hash;
  4. or download this
    my $hash;
use constant A => $hash = {'a' => 2};