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  1. or download this
    #!/usr/bin/perl
use warnings;
...
foreach($this_array){
    print("$_\n");
}
  2. or download this
    Use of uninitialized value $_ in concatenation (.) or string at derp.p
+l line 7.
  3. or download this
    #!/usr/bin/perl
use warnings;
...
foreach(@this_array){   # note @this_array not $this_array
    print("$_\n");
}