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  1. or download this
    use warnings;
    use Data::Dumper;
    ...
                } @things_to_sort;
    
    print Dumper \@sort
    
  2. or download this
    #!/usr/bin/perl
    use strict;
    ...
    fooo
    Use of uninitialized value in open at ./foo.pl line 18.
    fooo
    
  3. or download this
    #!/usr/bin/perl
    use strict;
    ...
    3
    Use of uninitialized value in open at ./foo.pl line 6.
    4