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  1. or download this
    #!/usr/bin/perl
    use strict;
    ...
    Use of uninitialized value in substitution iterator at bug.pl line 11.
    
    hello all
    
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    $1\{whatever\}
    
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    #!/usr/bin/perl
    use strict;
    ...
    begin{whatever}
    hello all
    end{whatever}
    
  4. or download this
    #!/usr/bin/perl
    use strict;
    ...
    world
    hello all
    world