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  1. or download this
    #!/usr/bin/perl
    use strict;
    use warnings;
    ...
    
    print "$hash{'$key'}{'$key'}\n";
    print Dumper(\%hash);
    
  2. or download this
    Use of uninitialized value in concatenation (.) or string at junk.pl l
    +ine 9.
    
    $VAR1 = {
    ...
                     },
              '$key' => {}
            };