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  1. or download this
    my %hash = ( 'key' => 'value' );
    
    ...
    
    print "exists \$array[\$index]\n" if exists $array[0];
    
  2. or download this
    exists operator argument is not a HASH element at test-5.00503.perl li
    +ne 7.
    
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    exists $hash{'key'}
    exists $array[$index]